Nanocrystalline Lanthanum Research Articles

Investigations on structure and optical properties of neutron irradiated nanocrystalline La2Zr2O7 pyrochlores

This research work investigates the response of nanocrystalline lanthanum zirconium oxide (LZO) under neutron irradiation, emphasizing grain size-dependent structural stability. LZO samples were synthesized with the chemical precipitation method and the LZO pellets were annealed at two different temperatures (1200 °C and 1400 °C) to obtain two different grain size samples, namely LZO-1200 and LZO-1400. The samples were exposed to neutrons at different doses (ranging from 1.63 × 1012 n/cm2 to 5.68 × 1014 n/cm2) and the effects were studied with X-ray diffraction, scanning electron microscopy, Raman scattering and optical characterization. The structural characterization results reveal that, the grain size and strain are significantly modified in LZO-1400 samples, and such changes are absent inLZO-1200 samples. The band gap and photoluminescence intensity are reduced significantly in LZO-1400 samples, however, this effect is not observed in LZO-1200 samples. The experimental results reveal that in LZO-1200 samples, the grain boundaries act as a sink for irradiation-induced defects and there is no significant change in the grain size, strain and band gap. However, in the case of the LZO-1400 sample, the grain size is larger than the cascades induced by primary knock-on atoms (PKAs) and it results in disorder-driven fast grain growth and changes in band gap and PL intensity. The LZO-1200 samples with small grain sizes are radiation resistant.

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation.

In recent years, fluoride pollution in water is a problem that has attracted much attention from researchers. The removal of fluoride-containing wastewater by adsorption with metal oxide as an adsorbent is the most common treatment method. Based on this, the effect of the doping ratio of La2O3, Fe2O3, and Al2O3 on the fluoride-removal performance was discussed by constructing a phase diagram. In this study, the adsorption mechanism of nanocrystalline lanthanum oxide terpolymer was investigated by density functional theory calculation and experiment. The optimal pH condition selected in the experiment was three, and the adsorption kinetics of fluoride ions were more consistent with the quasi-second-order kinetic model. The adsorption thermodynamics was more consistent with the Langmuir model. When the La-Fe-Al ternary composite oxides achieved the optimal adsorption efficiency for fluoride ions, the mass synthesis ratio was Al2O3:(Fe2O3:La2O3 = 1:2) = 1:100, resulting in a fluoride ion removal rate of up to 99.78%. Density functional calculations revealed that the La-Fe-Al ternary composite oxides had three important adsorption sites for La, Fe, and Al. Among them, the adsorption capacity for HF was Fe2O3 > La2O3 > Al2O3, and for F- was La2O3 > Al2O3 > Fe2O3. This provided good guidance for designing adsorbents to remove fluoride.

In Ukrainian

The aim of the work is the synthesis of nanodispersed phosphors based on lanthanum fluoride and phosphate, activated by terbium (LaF3:Tb3+ and LaРО4:Tb3+, respectively), promising for use in photodynamic therapy and optopharmacology, the study of their structural properties and luminescence spectra when excited by ultraviolet and X-ray radiation, as well as the possibility of their use in the composition of nanocomposites with magnetically sensitive nanosized Fe3O4 carriers and bioactive glass 60S. Nanocrystalline lanthanum fluoride and phosphate of hexagonal syngonium were synthesized, activated with terbium. The structural properties, chemical activity and biocompatibility of the surface, UV and X-ray luminescence spectra of the synthesized crystals were studied. The possibility of their use in the composition of nanocomposites with magnetically sensitive nanosized drug carriers and bioactive sol-gel glass is shown. The acid-base nature of the surface active centers of LaF3 and LaF3:Tb3+ NPs has been revealed. The proportions of negatively a––, positively a+ charged and neutral a0 active centers were calculated in the range of pH 2.4 – 12.7. The identified active surface centers can be represented by acidic (La3+) and basic (F-) Lewis centers, as well as basic Brønsted centers (OH- groups). The obtained data can be useful in optimizing the conditions of adsorption immobilization from a physiological solution of molecules of photosensitive substances (sensitizers) on the surface of phosphors based on lanthanum fluoride. Ensembles of particles of magnetically sensitive Fe3O4/LaF3:Tb3+ NCs of core-shell type were synthesized. The conditions of synthesis of NCs did not significantly change the magnetic properties of their cores – the initial single-domain Fe3O4 NPs. Composites of bioglass 60S with nanodispersed crystalline LaF3:Tb3+ and LaPO4:Tb3+ in the dry state and in distilled water medium demonstrated the presence of luminescence when excited by UV and X-ray radiation. The given data indicate the prospects of research of nanodispersed phosphors based on lanthanum fluoride and phosphate, their composites with magnetically sensitive nanosized carriers and bioactive glass, for use in optopharmacology and photodynamic therapy of tumor diseases, in particular, localized in organs of skull and bone tissues. In addition, research results can be useful for technical applications, in particular, in the creation of fluorescent detectors of high-energy electromagnetic radiation, development of photo- and optoelectronic devices, etc.

The influence of Dy3+ ions doping and annealing temperature on structural, morphological, and spectroscopic properties of lanthanum orthovanadate (LaVO4) material

In the current work, we present the results of nanocrystalline lanthanum orthovanadate (LaVO4) doped with dysprosium ions, which was synthesized by a high-energy ball milling (HEBM) process. Lanthanum, vanadium, and dysprosium oxides were employed as starting reagents. These materials were turned into LaVO4:Dy3+ powder with two polymorphic phases after HEBM and subsequent heating that was carried out in the air in the temperature range from 800 °C to 1200 °C. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and DRS (UV–vis) spectroscopy were used to characterize the obtained Dy-doped LaVO4 powders. The excitation and photoluminescence (PL) emission spectra, and time decay (lifetime) curves of the dysprosium (III) ions in LaVO4 material were measured and analyzed. The influence of annealing temperature and the concentration of dysprosium (III) ions (1%, 2%, and 3% at.) on spectroscopic properties was discussed. The qualitative phase analysis of Dy-doped LaVO4 powders indicated the dominant presence of a monoclinic LaVO4 structure. The presence of the tetragonal solid-solution (La, Dy)VO4 phase was also revealed. The structural transformation consists of an increase of Zr type LaVO4:Dy3+ phase, resulting in a higher structure and site symmetry of t-LaVO4:Dy3+. With increasing Dy3+ content, the relative fraction of the tetragonal (La, Dy)VO4 phase was also increased in all samples. Furthermore, XRD investigations showed that Dy3+ ions were incorporated mainly into the t-(La, Dy)VO4 structure. The increase of the amount of tetragonal phase in polymorphic LaVO4:Dy3+ material results in higher emission intensity caused by more efficient energy transfer from VO43− vanadate group to Dy3+ ions. The average sizes of the m-LaVO4 crystallites, estimated using the Rietveld method, were in a narrow range from 53 to 77 nm. Two main intense emission peaks were observed in the blue (466–495 nm) and yellow (557–594 nm) wavelength ranges and can be ascribed to transitions involving 4F9/2 to the stark split sublevels of 6H15/2 and 6H13/2, respectively. The overall intensity of the emission strongly depends on the annealing temperature. The best results were achieved for powder heated at 1200 °C. The values of the calculated average decay lifetime τavg of the LaVO4 powders doped with 1%, 2%, and 3% at. Dy heated at 800 °C, 1000 °C and 1200 °C were very similar, but one can observe that with increasing heating temperature the average decay lifetime of LaVO4:Dy powders slightly decreased regardless of the Dy concentration.

On the structural and magnetic properties of Sr-substituted LaMnO3 nanoparticles (La1-xSrxMnO3)

In this study, nanocrystalline lanthanum strontium manganite, La1-xSrxMnO3 (x = 0.2, 0.3, 0.4, 0.5, 0.6) where Sr substitutes in La-site are synthesized by sol–gel auto-combustion technique and annealed at 800 °C for 2hr. X-ray diffraction (XRD) study reveals the formation of a single phase rhombohedral crystal structure in all the samples. The crystallite size is calculated from Scherrer formula and the Williamson-Hall plot wherein the crystallite size are found to decrease with Sr substitution. Uniform and dense morphological structure are observed in the FESEM micrographs with average particle size ranging from 30 nm to 60 nm. Magnetic properties studied by using vibrating sample magnetometer (VSM) show decrease in saturation magnetization with increase in Sr substitution which demonstrates that ferromagnetic order is weakened and magnetic disorder increases. The maximum saturation magnetization of 32.8 emu/g is observed in La0.7Sr0.3MnO3 and has the most appropriate ratio of Mn4+: Mn3+ ≈ 1 for maximum double exchange interaction. The particle size of the nanoparticles is also found to affect the magnetocrystalline anisotropy of the system and observed to be in the order of 105 erg/cm3. These ferromagnetic LSMO along with their semi-metallic behaviour may be potentially utilised in nanoscale non-volatile memory and future spintronic devices.

Theoretical and experimental study on optical properties of lanthanum tungsten bronze in visible and near-infrared region

The contribution of near-infrared (NIR) region in solar thermal radiation accounts for almost half, and it brings great cooling energy consumption to buildings when incident indoors. While in the NIR region, most of the thermal radiation energy is concentrated in the low wavelength range of 780–1100 nm. As a typical NIR shielding material, alkali tungsten bronzes has shown great application potential, but its shielding ability at the low wavelength of NIR region still needs to be improved. In this work, nanocrystalline lanthanum tungsten bronze have been prepared by solid state reaction method, and exhibit strong NIR absorption in the low wavelength of NIR region. Nanocrystalline lanthanum tungsten bronze also shows good photocatalytic properties, its electronic structure and optical properties have been further studied by first principles calculation. Nanocrystalline lanthanum tungsten bronze is expected to play an important role in energy-saving windows due to its excellent optical properties.

SYNTHESIS AND PROPERTIES OF NANODISPERSED LUMINESCENT STRUCTURES BASED ON LANTHANUM FLUORIDE FOR OPTOPHARMACOLOGY AND PHOTODYNAMIC THERAPY

Nanocrystalline lanthanum fluoride of hexagonal syngonium and terbium-activated lanthanum fluoride were synthesized. The structural characteristics of the synthesized samples were investigated by XRD, TEM, FTIR, PCS methods. The colloidal stability of the suspensions and the acid-base characteristics of the surface were evaluated in the environment of physiological solution.
 Substitution of La ions by Tb ions in LaF3:Tb samples does not lead to a significant distortion of the crystal structure, but it significantly affects the dimensional characteristics, specific surface area, charge and acid-base characteristics.
 The given data indicate the perspective of research of nanodispersed phosphors based on lanthanum fl uoride for use in optopharmacology and photodynamic therapy of tumor diseases localized in the organ s of the skull and bone tissues. In addition, research results can be useful for technical applications, in particular, in the creation of fluorescent detectors of high-energy electromagnetic radiation, development of photo- and optoelectronic devices, etc.

In English

The purpose of the work is the synthesis of samples of X-ray luminescent nanodispersed lanthanum phosphate activated with terbium (LaРО4:Tb3+), the study of their structural properties and luminescence spectra when excited by ultraviolet and X-ray radiation, as well as determination of the possibility of their use in nanocomposites with bioactive glass and colloidal nanosystems. Samples of nanocrystalline lanthanum phosphate were synthesized composed of LaPO4·0.5H2O, of hexagonal syngonium, activated with terbium, their structural properties, luminescence spectra were studied upon excitation by UV and X-ray radiation, a possibility was shown to use them in nanocomposites with bioactive sol-gel glass and aqueous colloidal systems. Composites of 60S bioglass with nanodispersed crystalline LaPO4:Tb3+ in the dry state and in distilled water medium demonstrated the presence of luminescence when excited by UV and X-ray radiation. The given data indicate the perspective of nanodispersed phosphors based on lanthanum phosphate, their composites with bioactive sol-gel glass in colloidal systems, for use in optopharmacology and photodynamic therapy of diseases localized in bone tissues. In addition, the results of research can be useful for technical applications, in particular, in the creation of luminescent detectors of high-energy electromagnetic radiation, development of photo- and optoelectronic devices, etc.

Crystal Structure Refinement, Magnetic and Mössbauer Analysis of LaFeO3 Perovskite Synthesized by SOL-GEL method

In this present study, LaFeO3 nanoparticles have been successfully synthesized by sol-gel method and annealed the produced sample at 600 °C, 800 °C, 1000 °C, 1200 °C. The influence of annealing temperature on the structural, morphological and magnetic properties of the developed nanoparticles has been investigated systematically. The XRD patterns confirmed the absence of impurity or secondary phase in the spectra. Orthorhombic crystal system of pbnm space group was successfully determined by Rietveld refinement. Scherrer method was used to calculate crystallite size. An increasing trend in crystallite size and improving crystallinity were obtained with increasing annealing temperature. Scanning Electron Microscopy (SEM) images showed a homogeneous distribution of increasing average particle sizes ranging from 35 nm to 450 nm. Magnetic hysteresis (M-H) loop was recorded at room temperature revealed weak ferromagnetism in nanocrystalline lanthanum ferrite. The maximum magnetization was found to be 1.82 emu/g at 600 °C, and it was sharply decreased to 0.33 emu/g at 1200 °C annealing temperature. Interactions between the antiferromagnetic and ferromagnetic exchange coupling are influenced by the uncompensated spin canting causes to accomplish the ordering of weak ferromagnetism in LaFeO3. Moreover, the bond length of Fe-O and the bond angle of Fe-O-Fe were decreased with decreasing annealing temperature. As a result, Fe ions, come closer to each other, enhancing the ferromagnetic exchange interaction between iron ions via oxygen ions made significant contributions to the magnetic properties of LaFeO3 nanoparticles. Mössbauer spectroscopy was used to find the nature of interactions for the observed magnetic behavior depending on different site environments with varying annealing temperatures. Bangladesh Journal of Physics, 27(2), 27-37, December 2020

Optical and Magnetic Characteristics of LaFeO3 Nanoparticles Synthesized by Simple Co-Precipitation Method using Ethanol

Present study describes the synthesis of nanocrystalline lanthanum orthoferrite by co-precipitation method using ethanol as a solvent. LaFeO3 nanopowders formed after annealing the precursor at temperatures of 700, 800 and 900 ºC for 1 h, have a particle size in the range of 30-50 nm. According to XRD analysis, an increase in the annealing temperature from 700 to 900 ºC leads to an increase in the average crystallite size from 43.76 to 62.80 nm and a decrease in the unit cell volume of about 241.90 to 240.66 Å3. Synthesized LaFeO3 nanoparticles have strong absorption in ultraviolet (~ 200-400 nm) and visible light (~ 400-600 nm) and are soft magnetic materials with high magnetization.

Visualizing local fast ionic conduction pathways in nanocrystalline lanthanum manganite by isotope exchange-atom probe tomography

The study of the oxygen incorporation and diffusion in lanthanum manganite thin films is presented by means of novel isotope-exchange atom probe tomography, allowing a direct quantification of the enhancement of grain boundaries' oxygen kinetics.

Nanocrystalline Lanthanum Cobaltite as a Material for Gas Sensors

Nanocrystalline Lanthanum Cobaltite as a Material for Gas Sensors

Effect of Preparation Method and Ni2+ Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore

In order to establish the effective application of materials in a particular area, it is important to first investigate the physical and chemical properties, such as the crystallinity, structure, and the optical and surface properties. The objective of the present study is to fabricate thermally stable pyrochlore oxides, namely, lanthanum zirconate (La2Zr2O7, LZ) and Ni-doped lanthanum zirconate (La2Zr1.5Ni0.5O7, LZN) by the solid-state and sol-gel methods. The effects of the preparation and substitution of Zr4+ by Ni2+ for the resulting nanocrystalline samples were characterized in terms of structure, purity, porosity, the thermal and optical properties, and photoluminescence by different techniques: XRD, FT-IR, BET, EDS, TG-DTG, UV-Vis-DRS, and PL. The XRD results confirm that the pyrochlores prepared via the sol-gel method (LZ-sg and LZN-sg) had a cubic unit-cell lattice, whereas the solid-state method (LZ-s and LZN-s) had impurities of the oxides. The XRD patterns, LZ-sg and LZN-sg, were further treated with the Rietveld technique. The textural measurements reveal that LZ-sg had a higher BET surface area compared to LZN-sg. In addition, the substitution of Zr4+ by the Ni2+ ion provides rational evidence for the improvement in the oxygen mobility, as well as the optical and photoluminescence properties through the lowering of the optical band energy and the electron–hole pairs.

Preparation of Crystalline LaFeO3 Nanoparticles at Low Calcination Temperature: Precursor and Synthesis Parameter Effects.

Substantial effort has been devoted to fabricating nanocrystalline lanthanum ferrite (LaFeO3), and calcination is the crucial process of crystallization in both high-temperature strategies and wet chemical methods. Lowering the calcination temperature gives the ability to resist the growth and agglomeration of nanoparticles, therefore contributing to preserve their unique nanostructures and properties. In this work, we prepared crystalline LaFeO3 nanoparticles with a calcination process at 500 °C, lower than the calcination temperature required in most wet chemistry methods. Correspondingly, the experimental conditions, including stoichiometric ratios, pH values, precipitants, complexant regent, and the calcination temperatures, were investigated. We found that the crystalline LaFeO3 was formed with crystalline NaFeO2 after calcination at 500 °C. Furthermore, the structure of FeO6 octahedra that formed in coprecipitation was associated with the process of crystallization, which was predominantly determined by calcination temperature. Moreover, an illusion of pure-phase LaFeO3 was observed when investigated by X-ray diffraction spectroscopy, which involves amorphous sodium ferrite or potassium ferrite, respectively. These findings can help prepare nanostructured perovskite oxides at low calcination temperatures.

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La2Mo2O9

Nanocrystalline Lanthanum Molybdenum Oxide powders (having crystallite size from 67 nm-287 nm) and chemical composition: La2−xFexMo2O9 (x = 0.0, 0.012, 0.024, 0.036), synthesized by hydrothermal method is being reported in this research. XRD, SEM and EDS were used to study the structure, morphology, and chemical compositions respectively. Temperature dependent electrical and dialectic properties were examined at temperatures ranging from 300 K to 450 K. DC electrical conductivity was found to be increasing with increasing Fe3+ concentration. Furthermore, the measured dielectric loss was very small. It also exhibited a decreasing trend with increasing Fe3+ concentration. A lower dielectric loss makes such materials suitable potential candidates for applications in super capacitors.

Solid state-synthesized lanthanum orthovanadate (LaVO4) Co-doped with Eu as efficient photoluminescent material

The compositional and structural properties of nanocrystalline lanthanum orthovanadate (LaVO4), obtained through solid-state synthesis and co-doped with Eu3+ were investigated. Lanthanum and vanadium oxides were used as only starting reagents to synthesize LaVO4-Eu3+ nanocrystalline powders using a high-energy ball-milling (HEBM) process followed by air heating in temperatures between 600 and 1200 °C. The La2O3 powder, which served as the precursor for the HEBM synthesis, had a residual europium impurity which was found to be the effective Eu3+ ions source in the production of Eu:LaVO4. The powders were characterized using X-ray powder diffraction (XRD), Raman spectroscopy, X-ray photoelectron (XPS), Fourier-transform infrared (FTIR) absorption spectroscopy, emission spectroscopy (PL - photoluminescence and excitation spectra, UV–Vis DRS method), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The mean size of crystallites of LaVO4 were in the range of 53 nm–84 nm for annealing temperatures in the range of 600 °C–1200 °C, respectively. Due to a very low content of Eu3+ ions (less than 0.1 wt %) in the synthesized powders, the luminescence behavior of lanthanum orthovanadate with the monoclinic structure could be observed. The correlation between the structural, morphological and photoluminescent properties of LaVO4 was examined for the first time in this work.

Synthesis and Research of the Properties of Lanthanum and Neodymium Indates

Single-phase nanocrystalline (18–20 nm) lanthanum indate powder (LaInO3) and neodymium indate powder (NdInO3) with the structure of orthorhombic perovskite are synthesized by the coprecipitation of hydroxides with the simultaneous ultrasonic treatment of the precipitation and subsequent firing of the powder-precursors at a temperature of 700°C. Ceramic samples with an open porosity of 4 to 5% are obtained during the sintering of the LaInO3 and NdInO3 powders at 1300°C (2 h). The range of changes in the electrical resistance of the sintered ceramics in the temperature range 400–1000°C is established. It is revealed that the heat treatment (1000°C) of indates of lanthanum and neodymium in argon reduces the electrical resistance by 2–3 orders of magnitude compared to their heat treatment in air.

A novel ppm level ethanol sensor based on La loaded ITO impregnated with Pd and Sb additives

The present work reports on a novel resistive ppm level ethanol sensor, prepared from nanocrystalline lanthanum loaded indium tin oxide (ITO) impregnated with palladium and antimony additives. A simple unique gel calcination process was adapted to synthesize the nanocomposite powders from their water based precursor salts. This was followed by detailed material characterizations through X-ray diffractometer, FESEM, TEM, EDX and XPS analyses. Fabricated Taguchi type sensor with an optimum concentration of Pd exhibited an excellent sensing performance towards a wide concentration range of (1–100 ppm) ethanol vapour. The sensor showed ~87% sensing response for 10 ppm ethanol vapour at an operating temperature of 300 °C. Even at 1 ppm concentration, ~53% response was observed with fast response and recovery time. The sensing action has been elucidated as the catalytic oxidation of ethanol to carbon di oxide over the La loaded ITO surface layer that resulted in electron transfer to the indium tin oxide site. In addition, synergistic effect of palladium and antimony enhanced the sensing performance as well as reduced the base resistance of the sensor by chemical/electronic sensitization and increasing carrier ion concentration respectively. Comparatively low resistance, negligible cross sensitivity, quick response/recovery time and good long term stability makes the sensor suitable for deployment in practical applications.

Nanocrystalline lanthanum boride thin films by femtosecond pulsed laser deposition as efficient emitters in hybrid thermionic-photovoltaic energy converters

Lanthanum hexaboride (LaB6)-based thin films were successfully synthesized via femtosecond Pulsed Laser Deposition (fs-PLD) at room temperature and at high growth rate (>110 nm/min) for acting as electron and photon emitters in hybrid thermionic-photovoltaic devices applied in thermal-to-electrical energy conversion. The physical and chemical properties of the films were systematically investigated as a function of the most relevant deposition parameters (laser pulse repetition rate, pressure of the reactor, and deposition time) aimed at optimizing the material’s microstructure and functional optical and electronic properties. Specific growth conditions allowed for the achievement of thin films consisting of nanocrystalline LaB6 (10–20 nm grain-size) with enhanced spectral emissivity and low work function of (2.64 ± 0.03) eV, evaluated by thermionic emission measurements up to 1860 K, where a thermionic current density of 1.78 A cm−2 was measured. The obtained results demonstrate that fs-PLD represents a novel and rapid method for preparing efficient, and low-cost thermal electron emitters for innovative hybrid thermionic conversion devices operating at temperatures close to 2000 K.

Influence of manganese on multiferroic and electrical properties of lanthanum ferrite nanoparticles

In the present work, we have successfully prepared pure and Manganese (Mn) doped single phase nanocrystalline LaFeO3 by using an auto combustion route. X-ray diffraction (XRD) study ensures the purity of phase whereas the transmission electron microscope (TEM) measurement confirms the nanocrystalline nature. The details of the DC and AC conduction mechanism are studied to illustrate the dielectric behavior and charge transfer mechanism. The DC resistivity increases with the doping concentration which has been illustrated by Mott’s variable range hopping (VRH) model. The AC conductivity mechanism as a function of frequency (20Hz ≤ f ≤ 1MHz) and temperature (303K ≤ T ≤ 573K) is explained by correlated barrier hopping (CBH) model. The dielectric constant and activation energy (AC) increase with Mn concentration whereas dielectric loss decreases. So, the leakage behavior decreases within the samples. The XPS spectra confirm that there is a rise of Fe2+ and Mn4+ ions in the samples with the doping concentration which may be responsible for the enhancement in magnetization. Mixed ferromagnetic (ferromagnetic and antiferromagnetic) order exists within the samples. As a result exchange bias arises. We have achieved the highest value of the coercive field (2.5 kOe) in Mn doped LaFeO3 system. The room temperature ferroelectric and magnetodielectric measurements indicate that the polarization and magnetodielectric coefficient increases significantly by virtue of Mn doping. Therefore, an enhancement of multiferroic and magnetodielectric properties has been achieved for chemically prepared nanocrystalline lanthanum ferrite (LaFeO3) system by virtue of Mn doping. All the observations indicate that these materials to be potential candidates in the emerging field of spintronics.