Ignition Method Research Articles

Лазерное зажигание топлива жидкий кислород — газообразный водород в крупноразмерной камере сгорания

The article presents a review of the results of studies of laser ignition of a cryogenic mixture (gaseous hydrogen and liquid oxygen) in an experimental combustion chamber, carried out at the bench testing facility of KBKhA (Voronezh). A laser ignition module specially designed at the Keldysh Research Centre and with parameters optimized for use in the rocket engine launch system was used during the experiments. Fuel ignition by the laser system occurred directly in the experimental chamber without the use of an ignition device or pre-chamber. To implement this ignition method, inflammation of the fuel in the chamber was carried out by focusing the laser radiation into the mixture, with the initiation of a spark of optical breakdown in the selected area with conditions favorable for the start of combustion. The results of the experiments confirmed the efficiency of the laser module during both standalone and firing tests, including multiple launches of the propulsion unit operated on a cryogenic mixture (gaseous hydrogen and liquid oxygen).

Biochar altered native soil organic carbon by changing soil aggregate size distribution and native SOC in aggregates based on an 8-year field experiment

Soil aggregates play an important function in soil carbon sequestration because larger aggregates have higher soil organic carbon contents. A field experiment was set up in 2009 that included four treatments, i.e., B0, B30, B60, and B90 representing biochar application rates of 0, 30, 60, and 90 t ha−1, respectively. In 2017, we investigated the soil aggregate distribution, biochar and n-SOC contents in soil and different aggregate sizes using the ignition method, as well as the contribution of wheat and maize residues to n-SOC content in each aggregate by isotopic analysis. The results showed that, relative to B0, the n-SOC content presented an 14.0% decrease in B30, compared with an 18.8% and 8.2% increase in B60 and B90 (p < 0.05), respectively. Furthermore, the decreased n-SOC content in B30 was due to the decreased proportions of < 53 μm and 1000–250 μm aggregates. The increased n-SOC content in B60 was due to the significantly enhanced proportion of 2000–1000 μm and 1000–250 μm aggregates because the n-SOC contents of these two aggregates size classes were not changed by biochar. However, in B90, the increased n-SOC content was ascribed to the enhanced proportions of 2000–1000 μm and < 53 μm aggregates, although the n-SOC content in 2000–1000 μm aggregate was significantly decreased by biochar. Further analysis showed that the decreased n-SOC content in 2000–1000 μm aggregates was associated with decreased wheat-derived n-SOC content. In synthesis, our study showed a long-term effect of biochar on the n-SOC content by mainly changing soil aggregation and native organic carbon derived from wheat residue, and this effect was dependent on the applied amount. The biochar rate of 60 t ha−1 is recommended for carbon sequestration in terms of the more pronounced negative priming of native SOC, while the feasible combination between other biochars and soils needs further clarification.

Evaluating the Carbon Sequestration Performance of Three Selected Street Tree Species in Urban Setting: Colombo, Sri Lanka

Street trees are one of the most important components of urban green space in reducing the impacts of air pollution, providing shade, controlling noise pollution, arresting soil erosion and increasing aesthetics.With current interest of anthropogenic CO2 emissions through various activities in urban areas can be offset through increasing carbon sequestration by using appropriate street tree species.The role of urban street trees in CO2 sequestration potential is still remain uncertain in Sri Lanka due to absence of proper selection mechanism.The objective of this study is to derive and validate allometric equation to predict stem carbon accumulation by three selected street tree species; Madhuca longifolia (Mee), Cassia fistula (Ehala) and Pongamia pinnata (Karanda). Three species belong to different age groups with various characteristics of the tree crown, foliage, trunk, and roots within and between the species but the climatic condition is considered as similar in the sampling area due to the same meteorological station the area assigned. Tree parameters; dbh, total height, crown height and crown diameter were measured and C sequestration performance was tested in the laboratory using loss on ignition method for 60 individual trees from each three species. Streets were purposely sampled based on high abundance of species and trees were randomly sampled as 10 trees within 2 km road stretch. Stepwise regression model construction was carried out and validated with Model Bias (MB) and Modelling Efficiency (ME). Stem carbon content of M. longifolia is ln Cc=-4.59+3.471 ln dbh, C. fistula is ln Cc=-5.100+3.187 ln dbh and P. pinnata is ln Cc=-5.708+3.055 ln dbh with the reliability of 66%, 90% and 80% respectively. The model was fitted to the reserved data to be proved to use in the real world to predict carbon performance.Keywords: Carbon, Sequestration, Tree, Allometric equation

Investigation of the Effect of Foaming Agent on the Fabrication of NiTi Foams Using the Self-Propagating, High-Temperature Synthesis Process

Fabrication of NiTi intermetallic foams using the self-propagating, high-temperature synthesis (SHS) process was investigated. Weighed amounts of powders taken from an equimolar mixture of Ni and Ti powders along with 0.5, 1, and 1.5 wt pct of different foaming agents were cold pressed to form cylindrical compacts 10 mm in diameter, 20 mm in height, and 7 to 8 g in weight. A novel, induction-assisted ignition method was used for indirect heating and igniting the compressed mixtures at one end. As a result of intensive exothermic reaction between Ni and Ti and decomposition of foaming agents and liberation of gases, highly porous products were obtained. Characterization of the products was carried out using X-ray diffraction (XRD) and a scanning electron microscope equipped with an energy-dispersive spectroscope (SEM-EDS). The main phase in the products was detected to be B2(NiTi) with minor amounts of NiTi2 as the secondary phase. Other undesirable phases, such as Ni4Ti3 and Ni3Ti, were not detected. The effect of type and percentage of foaming agent on the formation and distribution of pores within the products was studied. Final products with porosities up to ~ 80 vol pct were obtained by adding foaming agent. Under the conditions of this study, CaH2 proved to be the most effective foaming agent considering its ability to generate a uniform distribution of pores, while TiH2 was not considered favorable due to its decomposition at relatively low temperatures. In general, the addition of foaming agents in amounts higher than 1wt pct is not recommended; due to the endothermic nature of thermal decomposition reactions of foaming agents, excessive use of these agents can result in suppression of the exothermic reaction.

The investigation of hydrogen evolution using Ca doped ZnO catalysts under visible light illumination

A series of Ca doped ZnO (CZO) nanoparticles have been prepared using sol gel self ignition method with an aim to increase the photocatalytic hydrogen evolution via water splitting under visible light illumination. The synthesized catalysts were characterized by analytical tools such as XRD, SEM, BET, EDS, XPS, FTIR, UV–Vis DRS, PL, CV and EIS. The XRD analysis points towards substitution of Ca into ZnO as revealed by shift of plane towards smaller 2θ value, and reduced crystal size. UV–Vis DRS and EIS analysis evidence that Ca doped ZnO catalysts demonstrate enhanced optical absorption and reduced impedance. XPS study evidenced the substitution of Zn+2 by Ca+2 and enhanced Zn–O bond strengths in CZO catalyst. Textural properties of CZO nanoparticles were superior to that of pristine ZnO. Among series of prepared CZO nanoparticles, the 3 mol% Ca doped ZnO (CZO4) was found to be most efficient candidate for hydrogen evolution under visible light illumination, whose hydrogen evolution rate (819.75μmolh−1) is twice than that of previously reported optimal ZnO photocatalysts. Small particle size, enhanced optical absorption, reduced interfacial resistance, narrow band gap and high surface area were recognized as responsible factors towards increased photocatalytic hydrogen evolution activities of Ca doped ZnO nanoparticles.

Impact of Co doping on physical, structural, microstructural and magnetic features of MgZn nanoferrites for high frequency applications

Cobalt (Co) doped MgZn spinel nanoferrites with composition Mg0.5Zn0.5Cox Fe2-xO4 at x = 0.0, 0.10, 0.20, 0.30, 0.40, 0.50 were prepared using sol-gel auto ignition method. The characterizations techniques such as FESEM, FTIR, XRD and VSM were used to determine the morphology, force constants, phase, structure and magnetic features of the samples. Lattice parameters, FWHM, d-spacing, crystallite size, micro strains and volume were investigated using high score plus software. Materials analysis using diffraction (MAUD) software was also used to study the Rietveld refinement properties of the Co doped MgZn ferrites. Physical properties such as porosity, X-ray and bulk density were also determined. Force constants of their respective absorption bands were calculated from FTIR of the Co doped MgZn nanoferrites. Single phase structure with cubic phase were observed for MgZn and Co doped MgZn at x = 0.0 whereas second phase was observed at higher Co concentrations respectively. FESEM show regular shape of the particles at low Co concentrations whereas agglomerations were observed at higher Co concentrations respectively. The magnetic properties of the Co doped MgZn ferrites were also investigated from VSM study. Magnetic remanence, coercivity, initial permeability, saturation magnetization, Bohr magneton and anisotropy constant were determined from VSM analysis. The coercivity, saturation magnetization, remanence, anisotropy constant and initial permeability were enhanced with the doping of ‘Co’ in MgZn nanoferrites. Response of the Co doped MgZn nanoferrites at high frequency regime was also evaluated. It can be seen that the response from all the Co doped MgZn nanoferrites was 2.84 GHz–5.96 GHz respectively and suggested the use of these nanoferrites for the operation of nanodevices in the X-band high frequency regime.

Fundamental characteristics of laser breakdown assisted long distance discharge ignition

Towards the realization of lean combustion, a new ignition method called laser breakdown-assisted long-distance discharge ignition (LBALDI) has been developed. This method is expected to realize volumetric ignition by extending the initial flame kernel via the generation of a long discharge, thereby improving the lean combustion limit. In this study, the fundamental characteristics of LBALDI such as the influence of fuel on the ignition of long discharge were investigated. Conventional spark ignition (SI) and LBALDI in which the electrode distances were 1 mm and 8 mm, respectively, were compared using a constant volume vessel with a window for flame imaging based on the schlieren method. It was determined that the extension in the ignition limit using LBALDI was more pronounced in a lean propane and rich methane premixture compared to a rich propane and lean methane premixture, respectively. These combinations correspond to premixtures with a Lewis number larger than unity for the deficient reactant. This behavior is attributed to the generation of large initial plasma for LBALDI compared to SI.

Synthesis of NiO–CeO2 nanocomposite for electrochemical sensing of perilous 4-nitrophenol

Well-crystalline NiO–CeO2 nanocomposites have been fabricated by ignition method and investigated by X-ray diffraction, Fourier Transform Infrared, UV–Vis diffuse reflectance spectroscopy, Thermal gravimetric analysis, BET surface area, and transmission electron microscopy. The detailed characterizations disclosed that the pre-calcine (700 °C) nanocomposite (NCC) has two pure phases: cubic fluorite phase (CeO2) and cubic face-centered phase (NiO). Finally, the pre-calcine NCC nanocomposite was applied as electron intermediators for the electrochemical sensing of 4-nitrophenol (4-NP). Compared with as-grown modified electrode (NCG/GCE), pre-calcine electrode (NCC/GCE) exhibited more excellent conductivity and better electrocatalytic mediator for 4-NP. It was found that the NCC/GCE sensor displayed diffusion-controlled kinetics and excellent sensitivity (3.68 AμM−1 cm−2). The reduction current is directly proportional to the 4-NP concentration, ranging from 1 to 20 μM with lower detection limit of 2.48 μM.

Estimasi Stok Karbon pada Biomassa Lamun di Pulau Semak Daun, Kepulauan Seribu

&lt;strong&gt;Carbon Stock Estimation in Seagrass Biomass on Semak Daun Island, Thousand Islands&lt;/strong&gt;. Seagrass ecosystem has a vital role in protecting the coastal ecosystem. It can also sequester and store carbon as an organic material (blue carbon) for a long time. However, anthropogenic activities in coastal areas give environmental stress on the seagrass ecosystem. This research was conducted to assess the carbon stock of seagrass biomass in Semak Daun Island in order to evaluate the potential of the seagrass meadows in sequestering carbon. Sampling and observation were held in the seagrass ecosystem to obtain seagrass density, biomass, frequency of occurrence, water quality, and anthropogenic activity. Carbon stock was calculated by the loss of ignition (LOI) method, and combined with density to determine the total carbon stock in the whole area of seagrass meadows. Seagrass species in Semak Daun Island consist of Halophila ovalis, Thalassia hemprichii, Cymodocea rotundata, Syringodium isoetifolium, and Halodule uninervis. The coverage area of seagrass in Semak Daun Island was 9.1 ha with carbon stock value of 1.84 ton C or equivalent to 6.76 ton CO2. Fifty two percent of the carbon stock was originated from the below-ground biomass and 48% from the above-ground biomass.

The Effect of Fe and Mn Substitution on Structural and Electrical Properties of LaCoO3 Nanoparticles

Pure and Fe, Mn doped LaCoO3 nanoparticles are primed by sol gel ignition method, and their electrical properties are studied. All the materials were characterized to study the structure and morphology. The chemical composition of the samples was analysed by EDAX analysis revealing that La, Co, O (Mn, Fe) compounds were present. Electrical properties were identified in impedance analysis and the conductivity of the materials was calculated. And it is found that Fe doped LaCoO3 possesses higher conductivity than all others.

Study on initial combustion characteristics of kerosene based on inductive charging ignition system

Spark ignition is an important method to achieve combustion of in-cylinder mixture. The inductive charging ignition is considered to be a simple and effective ignition method. This study presents a circuit simulation model of this ignition system in MATLAB/Simulink and the effects of charging voltage, charging time and multi-pulse charging interval on ignition energy were calculated and the ignition energy value was obtained. The experimental study of the ignition system in a constant volume vessel was carried out to explore the influence of ignition energy on the initial combustion of kerosene. The results show that the simulation results match well with the experimental results. With the increase of ignition energy, the initial flame propagation of kerosene shows speed fluctuations and the higher ignition energy makes the propagation speed of flame fluctuate more obviously.

Effect of voltage and droplet size on electrical ignition characteristics of ADN-based liquid propellant droplet

To remove the dependence of ammonium dinitramide (ADN)-based liquid space engine on the catalyst, a new thermal ignition method was developed for ADN-based liquid propellant resistant to ignition. Experiments of ADN-based liquid monopropellant droplets were carried out in a constant-volume chamber. Ignition delay time and combustion duration were defined to study the electrical ignition characteristics of single droplet. The results show that the ADN-based liquid propellant droplets could be ignited using the current thermal effect of droplets after electrification at appropriate voltage. Droplets were accompanied by bubble formation and gases escape from the droplets during evaporation, decomposition, and combustion. With the increase in voltages, the ignition delay time and combustion duration of ADN-based liquid propellant droplets decreased with the increase in voltage overall when the initial volumes of droplets were 4.189 μL. The ignition delay time of droplets increased with the increase in the initial volume of droplet. The combustion duration of droplets showed fluctuant variation trend with the increase in the initial volume of droplet. When the initial volume of droplet increased to a certain extent, combustion self-sustainment could not be achieved at the later stage of combustion.

Effect of synthesis route on the electrochemical performance of CoMnFeO4 nanoparticles as a novel supercapacitor electrode material

In this study, CoMnFeO4 ternary metal oxide nanoparticles are prepared via hydrothermal and sol-gel ignition methods. Their structures are investigated and characterized by FT-IR, XRD, XPS, BET, SEM, EDX and HR-TEM analysis. Also, magnetic properties of nanoparticles synthesized by two methods are compared on a vibrant sample magnetometer (VSM) with maximum saturation magnetization values found to be 28.83 emu g−1 and 23.17 emu g−1, respectively. SEM and HR-TEM results reveal that the mean particles size of hydrothermally synthesized (about 25 nm) nanoparticles is smaller and more uniform than that of their counterparts synthesized by sol-gel ignition method (about 65 nm). Their supercapacitor behaviors are studied and compared by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) methods. The hydrothermally synthesized sample shows higher specific capacitance of about 770 F g−1 (at 1 A g−1) in 3 M KOH while this value for the sample synthesized by sol-gel ignition approach is about 150 F g−1. The higher specific capacitance can be attributed to smaller particle size, more electroactive sites due to higher specific surface area, and quantum size effects. Also, some initial mechanistic studies are performed to achieve a deeper insight into the electrochemical behavior of the nanoparticles implying that the oxidation-reduction process of nanoparticles is generally quasi-reversible and diffusion-controlled. So, by considering the higher performance, the hydrothermal approach developed here is beneficial from cost, time and environmental points of view.

Octylamine as a novel fuel for the preparation of magnetic iron oxide particles by an aqueous auto–ignition method

Magnetic particles were successfully synthesised by a new and simple one-step auto-ignition method, with octylamine as organic fuel and iron nitrate nonahydrate as an oxidant, both in an aqueous solution. After synthesis and stabilising at 550 °C in reduced atmosphere, the samples consisted of mostly well crystalline magnetite (Fe3O4), with a small amount of hematite present, in the form of micron–scale agglomerations of nanoparticles. A noticeable reduction of crystallite size of magnetite (42–28 nm) and an increase in the hematite crystallite sizes were observed with increasing octylamine addition, although the actual observed nanoparticle size increased slightly from ∼30 up to 50 nm. The magnetic properties were assessed at room temperature, and all were found to be strongly ferrimagnetic with very narrow hysteresis loops. The saturation magnetisation at 4 T was 77.2–91.6 A m2 kg−1, and coercivity was only 10.03–11.30 kA m−1 (126–142 Oe). These results are also compared to the few previous studies on using octylamine to produce magnetite nanoparticles, which were all purely organic hydrothermal processes, and produced materials with lower magnetisation values and comparable coercivity in similarly sized particles.

Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities

Superconducting radio frequency cavities performance preservation is crucial, from vertical test to accelerator operation. Field emission is still one of the performance limiting factors to overcome, and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters (hydrocarbon contaminants) and increasing the work function of Nb. The cleaning for Linac Coherent Light Source-II will follow the same plasma composition adopted at SNS, which allows in situ processing of cavities installed in cryomodules. A novel method for plasma ignition has been developed at the Fermi National Accelerator Laboratory: a plasma glow discharge is ignited using high order modes to overcome limitations imposed by the fundamental power coupler. The plasma can be easily ignited and tuned in each of the cavity cells using low radio frequency (RF) power, from 100 W to as low as 2 W depending on the gas and pressure. A method for RF plasma detection has been developed: the plasma location is identified within the cavity without the need of cameras. The presented method can be applied to other multicell cavity designs, even for accelerators where the coupling for the fundamental modes at room temperature is very weak.

Behavior of Eu, Pu, U in utilization of radioactive graphite by ignition method in oxygen

The behavior of some radionuclides (U, Eu, Pu) in the utilization of radioactive graphite by the combustion method in oxygen is considered. The study was carried out by thermodynamic modeling in the temperature range 300-3300 K. The main physicochemical processes occurring during oxidation were established.

Comparative analysis of the effects of gunpowder and plasma ignition in closed vessel tests

Abstract This paper presents the results of a comparative investigation into the effects of the ignition method on the ballistic properties of a single-base gun propellant, as determined via closed vessel tests. Conventional gunpowder ignition and plasma jet ignition methods were used, and differences in the ignition time were analysed. The influence of the ignition method on the dynamic vivacity is discussed. It is shown that this influence is significant in the first phase of the combustion process, and with respect to the low values of the loading density. In the second phase of the combustion process, and for large values of the loading density, the dynamic vivacity plots for the two ignition methods converge. Regarding the burning law, close values of the exponent were obtained for the two ignition methods. The dynamic vivacity plots determined for plasma ignition reveal stronger dependence on the loading density than those determined for gunpowder ignition. The conclusion is that plasma ignition is not a solution to the problems inherent to the process of determining the ballistic properties of propellants, which results in deviation of the burning process from the geometric burning law.

Characterizing Organic Carbon Storage in Experimental Agricultural Ditch Systems in Northeast Arkansas

Core Ideas Agricultural drainage ditches can be considered as carbon sinks. Agricultural ditches can provide an optimum environment for carbon sequestration. Soil topography influences spatial carbon storage within wetlands. Soil bulk densities influence carbon storage in wetlands. Agricultural ditches are capable of many ecological functions, including flood control and edge of field nutrient filtration. This study investigated the potential for carbon sequestration within mowed and unmowed experimental conventional and controlled (with weirs) agricultural drainage ditches. The study analyzed and compared spatial and temporal variation in soil organic carbon (OC) concentration (g C kg–1) and OC pool (kg C m–2) within a 3‐cm soil depth between treatments. Soil OC concentrations were quantified through combustion of organic matter (OM) at 400°C in a muffle furnace for 16 h using the loss on ignition (LOI) method. Soil bulk density was also determined for each ditch treatment. In both summer and winter, mean soil C concentration in ditches with weirs was similar to mean soil C concentration in ditches with no weirs (16.68 ± 0.49 vs. 16.47 ± 0.46 g C kg–1 in summer; 14.47 ± 0.75 vs. 16.27 ± 0.72 g C kg–1 in winter). Similar bulk densities (0.67 Mg m–3, on average) and OC contents in ditches furnished comparable C pools in ditches with weirs and no weirs respectively (28.08 ± 0.75 vs. 27.88 ± 0.68 kg C m–2 in summer; 26.44 ± 1.56 vs. 30.24 ± 1.40 g C kg–1 in winter). The studied drainage ditches can therefore be considered for their contributions to the C sink, given the high values of C pool observed in the ditch treatments. This suggests agricultural drainage ditches can offer a suitable environment for C sequestration.

Applicability of high-pressure direct-injected methane jet for a pure compression-ignition engine operation

Natural gas has been suggested as an alternative fuel for compression ignition (CI) engines because it generates significantly less pollutants and has a smaller carbon footprint, while maintaining the cycle efficiency. However, the high auto-ignition temperature of natural gas typically requires the use of a quasi-compression ignition method such as homogenous charge compression ignition (HCCI) or a dual-fuel mode. Yet, methods such as these are unable to realize the full potential of high efficiency and low emissions. This motivated us to evaluate the applicability of a high-pressure direct-injected natural gas jet for a pure CI engine under various engine load, injection timing, and injection pressure conditions using a single cylinder CI engine with a compression ratio of 15.5. The intake temperature was raised to 400 °C to achieve the auto-ignition temperature of methane after compression and a multi-hole GDI injector capable of operating at a pressure of 400 bar was used for fuel injection.As a result, CI operation was possible, but ignition occurred after the end of the injection in the form of a partially premixed flame rather than a diffusion flame for all conditions under which the engine was operated. A sufficient equivalence ratio of 0.8 was achieved at an injection pressure of 300 bar and injection duration of 1.6 ms with the multi-hole GDI injector, and the GMEP value varied from 2 bar to 5.5 bar according to the equivalence ratio. However, at an equivalence ratio of 0.7 or higher, the combustion efficiency decreased drastically because of the limit of the volume fraction of the piston bowl at TDC and the narrow nozzle distribution of the GDI injector. Measurement of the pollutants indicated that the total number of particles from methane CI operation exceeded that of diesel at an equivalence ratio of 0.74 in the same engine setup because of incomplete combustion; however, the total mass of the particulate matter (PM) was approximately 15% of the diesel because the average particle size from methane CI was approximately one third smaller than that of diesel. However, the high post-compression temperature for the auto-ignition of methane gas resulted in a high peak temperature, which resulted in the production of approximately 2000 ppm NOx under all test conditions. The results of the parametric study showed that, as the injection timing retarded, the ignition timing was almost equally retarded, thus the combustion was still observed in the form of a diffusion flame. As the injection pressure increased, the ignition delay became shorter and the emission of PM could be further reduced, but the NOx emission increased.

Impact of indium substitution on dielectric and magnetic properties of Cu0.5Ni0.5Fe2-xO4 ferrite materials

Indium substituted CuNi nanoferrites with nominal compositions Cu0.5Ni0.5InxFe2-xO4 (x = 0.00–0.32) were successfully synthesized by sol-gel auto ignition method. X-ray diffraction patterns illustrated the single phase spinel structure for x ≤ 0.24. The lattice parameter ‘a’ increased from 8.3349 to 8.3723 Å and then it decreased for x = 0.32. X-ray density increased from 5.43 to 5.79 g/cm3. The average crystallite sizes lie in the range 33.21–17.78 nm. The cell volume was increased from 579.03 to 586.86 Å3 with the substitution of indium ions into the spinel lattice of copper nickel ferrites. The compositional dependence of tetrahedral and octahedral radii was explained on the basis of lattice parameter. The incorporation of In3+ ions in copper nickel ferrites exhibited the decreased in bulk density. The dielectric parameters were explained over entire range of frequency (1M-3 GHz). The dielectric parameters i.e dielectric constant, dielectric loss and tan loss were found to decrease with the increase of indium concentration. The saturation magnetization (Ms) and Bohr magneton (nB) first increased and then decreased. The remanence (MR) was increased with the substitution of indium ions. The coercivity and anisotropy constant were decreased which might be due to weak A-B super exchange interaction. The results of magnetic and dielectric properties suggested that In3+ substituted copper nickel ferries are suitable for high frequency applications.