Strong Diffraction Peak Research Articles

Calcination Conditions on the Properties of Porous TiO2 Film

Porous TiO2 films were deposited on SiO2 precoated glass-slides by sol-gel method using PEG1000 as template. The strongest XRD diffraction peak at 2θ = 25.3° is attributed to [101] plane of anatase TiO2 in the film. The increases of calcination temperature and time lead to stronger diffraction peak intensity. High transmittance and blue shift of light absorption edge are the properties of the film prepared at high calcination temperature. The average pore size of the films increases with the increasing calcination temperature as the result of TiO2 crystalline particles growing up and aggregation, accompanied with higher specific surface area. Photocatalytic activity of porous TiO2 films increases with the increasing calcination temperature. The light absorption edge of the films slightly moves to longer wavelength region along with the increasing calcination time. The mesoporous film calcinated at 500 °C for 2 h has the highest transmittance, the maximum surface area, and the maximum total pore volume. Consequently, the optimum degradation activity is achieved on the porous TiO2 film calcinated at 500 °C for 2 h.

Characterization of Physicochemical Properties of Starch in Barley Irradiated with Proton Beam

The study was carried out to determine the gel pasting properties of barley (Hordeum vulgare L. cv. Geoncheonheugbori) as affected by different proton beam irradiation. The λmax, blue value, and amylose content were significantly associated with increasing proton beam irradiation. The pasting time in barley flour irradiated with proton beam ranged 0.09 to 0.16 min shorter than nonirradiated barley flour. Gel pasting temperature ranged 57.4 to 60.5℃. Gel pasting temperature in barley flour decreased with increasing proton beam irradiation. Proton beam irradiation caused a significant decrease in the onset temperature (To), peak temperature (Tp), conclusion temperature (Tc) and enthalpy change (ΔH). Gelatinization range (R) in barley starch was more broaden than that of non-irradiated barley starch. Barley starches gave the strong diffraction peak at around 2θ values15°, 18°, 20°, and 23° 2θ. Peak intensity tended to increase with increased proton beam irradiation. The granule crystallinity is closely associated with decreased amylose and increased amylopectin component. The crystallinity degree of barley starch irradiated with proton beam was significantly increased and it ranged from 24.9 to 32.9% compared to the non-irradiated barley starches. It might be deduced that proton beam irradiation causes significant changes of properties of starch viscosity in rice, especially at high irradiation of proton beam.

Anodized Preparation of Titanium Dioxide Nanotube Arrays and Photocatalytic Degradation of Chloramine Phosphorus

Anodic oxidation processing titanium foil in an aqueous solution of hydrofluoric acid+ glacial acetic acid+polyethylene glycol constant pressure, Synthesized by high-density ordered TiO2nanotube arrays. Calculate the degradation rate of chloramine phosphorus, TiO2nanotubes catalytic performance test.The use of scanning electron microscopy (SEM) and X-ray diffraction (XRD) to characterize the morphology and structure of the nanotubes, Visits oxidation time on the morphology and size of the nanotube arrays, mapping and analysis of current - time curve. An average particle diameter d of the sample may be calculated the strongest diffraction peak of the plane FWHM ,So chloramine phosphorus selection of organic phosphorus drugs for the photocatalytic degradation object, Molybdenum blue spectrophotometry measured and calculated degradation rate, Study of heat treatment temperature and anodizing time photocatalytic degradation, And the sol - gel prepared TiO2 thin film and photocatalytic comparative experiments.

Controllable growth of ZnO nanorods by seed layers annealing using hydrothermal method

ZnO nanorods have been synthesized by hydrothermal method on sol–gel derived ZnO seeds/p-Si substrates. The effect of annealing temperature of seed layers on the morphological, structural and optical properties of ZnO nanorods is systematically investigated. It is found that the diameters of nanorods is controllable ranging from 30 to 200nm via seed layers annealing and the morphologies of ZnO nanorods change from tapered needle- to hexagonal-like structures. X-ray diffraction measurement shows that all nanorods possess a strong diffraction peak at 34.78° corresponding to ZnO (002) plane and no impurity phase is observed. Photoluminescence (PL) spectrum study shows that all samples exhibit strong near band edge emissions at 392nm and defect related broad visible emissions centered at 550nm. With increasing ZnO seeds anneal temperature, the visible emission intensity decreases gradually, which is attributed to the decreases of oxygen vacancies at high annealing temperature.

A Combined Theoretical and Experimental Study of Solid Octyl and Decylammonium Chlorides and of Their Aqueous Solutions

The analysis of the thermal behavior of octyl- (OAC) and decylammonium chloride (DAC) has provided relevant new information. OAC shows a polymorphic phase transition that starts at 308 K and is completed at 313 K, between a monoclinic and a tetragonal structure, which belongs to a space group different from what was observed for other alkylammonium chlorides. At the melting temperature (463 K), the growing of a strong first sharp diffraction peak (FSDP) occurring at a d-spacing of ca. 21.0 Å was observed. DAC is characterized by two phase transitions at 318 (T(d1)) and 323 K (T(d2)). At T(d1), the LT polymorph coexists with a new-formed phase. At T(d2) the LT polymorph is replaced by a further polymorphic modification of DAC that becomes the only one at 328 K. This second phase transition signals the occurrence of a phase, closely related to the LT polymorph of HeAC, that crystallizes in the tetragonal crystal system a = ca. 5.00 Å and c = ca. 28.5 Å, P4/nmm space group. DAC melting starts at 458 K and is accompanied, as in the case of OAC, by the growing of a strong FSDP at a d-spacing of ca. 24.8 Å. A parallel DSC study confirmed the above-mentioned transitions. In addition, the structural properties of OAC/water and DAC/water mixtures were studied using an integrated approach, which combines X-ray diffraction and molecular dynamics (MD) techniques. A very good agreement between theoretical and experimental diffraction patterns has been obtained for both investigated mixtures. A thorough analysis of the MD trajectories shows that strong anion-water interactions are present in the mixtures, where Cl(-) forms a rather unstructured first hydration shell of water molecules bound to the anion in a linear Cl···H-O configuration. Moreover, cations and anions were found to interact with each other, and to form "solvent-shared ion pairs", in which one or more water molecules are shared between Cl(-) and the alkylammonium cation.

Seaweed-mediated synthesis of gold nanoparticles using Turbinaria conoides and its characterization

Abstract The synthesis of metal nanoparticles using algae has been unexplored, but it is a more biocompatible method than the other biological methods. Metal nanoparticle synthesis using algae extract shows rapid and non-toxic process which resulted to nano sizes having the greatest potential for biomedical applications. In this investigation, we studied the green synthesis of gold nanoparticles using the algae extract of Turbinaria conoides. Green synthesis of gold nanoparticles was preliminarily confirmed by color changing from yellow to dark pink in the reaction mixture, and the broad surface plasmon resonance band was centered at 520 to 525 nm which indicates polydispersed nanoparticles. Transmission electron microscopy and selected-area electron diffraction analysis show the morphology and crystalline structure of synthesized gold nanoparticles with the size range of 6 to 10 nm. The four strong diffraction peaks were observed by X-ray diffraction; it confirmed the crystalline nature of synthesized gold nanoparticles. The carboxylic, amine, and polyphenolic groups were associated with the algae-assisted synthesized gold nanoparticles which was confirmed using Fourier transform-infrared spectroscopy. This study eliminates the use of chemical substances as reducing and stabilizing agent. Because it has natural several constituents which are fucoidan and polyphenolic substances, it does a dual function as both reducing and stabilizing agent for nanoparticles. Thus, algae-mediated synthesis process of biomedically valuable gold nanoparticles is a one-spot, facile, convenient, large-scaled, and eco-friendly method.

Effects of Surface Morphology of ZnO Seed Layers on Growth of ZnO Nanostructures Prepared by Hydrothermal Method and Annealing

ZnO nanostructures were grown on Si (111) substrates by a hydrothermal method. Prior to growing the ZnO nanostructures, ZnO seed layers with different post-heat temperatures were prepared by a spin-coating process. Then, the ZnO nanostructures were annealed at 500 degrees C for 20 min under an Ar atmosphere. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) were carried out at room temperature (RT) to investigate the structural and optical properties of the as-grown and annealed ZnO nanostructures. The surface morphologies of the seed layers changed from a smooth surface to a mountain chain-like structure as the post-heating temperatures increased. The as-grown and annealed ZnO nanostructures exhibited a strong (002) diffraction peak. Compared to the as-grown ZnO nanostructures, the annealed ZnO nanostructures exhibited significantly strong enhancement in the PL intensity ratio by almost a factor of 2.

FTIR, XAS, and XRD study of cadmium complexes with l-cysteine

Cysteine (cys) plays a vital role in the detoxification of cadmium (Cd), but the coordination of this metal to cys is not well understood, although extensively studied. In this investigation, our results showed that the ratio Cd:cys 1:2 precipitate as a amorphous white powder, the Cd:cys 1:4 provided for a viscous liquid without precipitating, while the Cd:cys 1:6 resulted in long, clear, needle-like crystals. FTIR and XAS analysis indicated that cys was coordinated to Cd through S ligands on the cys. EXAFS of the Cd:cys products showed small differences in the coordination environment. The complex from Cd:cys 1:2 reaction displayed two different Cd–S interactions at 2.69 and 2.54Å, each consisting of two neighboring atoms. The complex from the Cd:cys 1:4 reaction showed four equally distant Cd–S interactions at 2.47Å. The comples from the Cd:cys 1:6 reaction exhibited a Cd–S interaction of four S ligands at approximately 2.54Å. All the Cd:cys complexes had a tetrahedral arrangement of S ligands around the central Cd atom. The XRD demonstrated that the Cd:cys 1:2 and 1:4 reaction products were amorphous and no diffraction peaks were observed. However, the Cd:cys 1:6 reaction product showed strong diffraction peaks, crystallizing into a monoclinic unit cell (C2/C).

A Simple Method for Incorporating Lead Sulfide Nanoparticles Directly in Poly (3-hexyl thiophene) (P3HT) Matrix

In the present study, nanoparticles (NPs) of lead sulfide (PbS) have been directly incorporated in poly (3- hexylthiophene) (P3HT) matrix without any surfactant. The X-Ray diffraction and absorption spectrum confirm the incorporation of PbS NPs in P3HT matrix. The strong and sharp diffraction peaks indicate that the as-prepared PbS NPs are crystalline. The absorption spectrum of P3HT in solution shows a characteristic wide peak at 451nm. The extension of the blend absorption beyond the main polymer exciton peak at ca. 451nm is due to the presence of PbS nanoparticles. The broad photoluminescence in the visible spectral region from the P3HT-PbS blend is observed, which is very much dependent on the PbS concentration.

Effects of high pressure annealing technique on the structure, morphology and electric properties of 0.65PMN-0.35PT thin films

Thin films of 0.65PMN-0.35PT PMN=Pb (Mg1/3Nb2/3)O3 and PT=PbTiO3 with a thickness about 250 nm were prepared on LaNiO3/SiO2/Si substrates by radio frequency magnetron sputtering. The films were annealed using high pressure annealing (HPA) technique in oxygen atmosphere. Effect of HPA on the crystal structure, morphology and electrical properties of the films was studied. XRD patterns of the films indicated that PMN-PT films treated by HPA in oxygen atmosphere (annealing temperature 400℃) showed a pure perovskite phase, with highly (100) preferred orientation. The strong and sharp diffraction peak showed the better crystallization of PMN-PT thin films after HPA. SEM observations showed that a rod or bubble morphology was present on the films surface. Ferroelectric properties tests showed that the PMN-PT film annealed in oxygen atmosphere at a pressure of 4 MPa, and annealing time of 4 h had good ferroelectric properties, in which the remanent polarization (Pr) could reach 10.544 uC/cm2. The shape of electric hysteresis was better, but the leakage current was too large, which may be due to the microstructure of the films. Meanwhile, the dielectric tests indicated that PMN-PT thin films could show very good dielectric properties, and the dielectric constant (r) could reach 913, and dielectric loss (tg) was very small, only 0.065.

Study of Degradation of Photocatalytic Methyl Orange on Nano Nd<sub>x</sub>Co<sub>2-x</sub>Zr<sub>2</sub>O<sub>7</sub>

Cubic pyrochlore type NdxCo2-xZr2O7 nano-crystals were prepared by salt-assistant glycine solution combustion method (SGCM), with neodymium nitrate, cobalt nitrate and zirconium nitrate as raw materials, glycine as the incendiary agent, and KCl as a reaction inert salt. The NdxCo2-xZr2O7 nano-crystals were characterized by means of XRD (X-ray powder diffraction), FT-IR (Fourier trans-form-infrared spectroscopy), Raman spectroscopy, TEM (Transmission electron microscope) and HRTEM (High resolution transmission electron microscopy). The results showed that neodymium ions were partially substituted by cobalt ions, while maintaining the original pyrochlore structure. The nano particles obtained had a perfect crystal structure, good dispersion, and the size was about 31nm. For Nd1.9Co0.1Zr2O7 nanocrystals, the four strong diffraction peaks were at 2θ=29.18°, 33.80°, 48.49° and 57.53°. The corresponding crystal plane distances calculated by Bragg equation λ = 2dSinθ were 0.306, 0.265, 0.188 and 0.160 nm. With the study of the photocatalytic activity of the product, it is found that compared with the undoped crystals, photocatalytic activity of dopped products had been significantly improved and different doping amount led to different levels of catalytic activity. When nNd:nCo = 9:1, the 2 hours net degradation amount was as high as 83%.

Study of Preparation of Nano Nd<sub>x</sub>Co<sub>2-x</sub>Zr<sub>2</sub>O<sub>7</sub> and its Catalytic Properties on Ammonium Perchlorate Thermal Decomposition

Cubic pyrochlore type NdxCo2-xZr2O7nano-crystals were prepared by salt-assistant glycine solution combustion method (SGCM), with neodymium nitrate, cobalt nitrate and zirconium nitrate as raw materials, glycine as the incendiary agent, and KCl as a reaction inert salt. The NdxCo2-xZr2O7nano-crystals were characterized by means of XRD (X-ray powder diffraction), FT-IR (Fourier trans- form-infrared spectroscopy), Raman spectroscopy, TEM (Transmission electron microscope) and HRTEM (High resolution transmission electron microscopy). The results showed that neodymium ions were partially substituted by cobalt ions, while maintaining the original pyrochlore structure. The nano particles obtained had a perfect crystal structure, good dispersion, and the size was about 31nm. For Nd1.9Co0.1Zr2O7nanocrystals, the four strong diffraction peaks were at 2θ=29.18°, 33.80°, 48.49° and 57.53°. The corresponding crystal plane distances calculated by Bragg equation λ=2dSinθ were 0.306, 0.265, 0.188 and 0.160 nm. Study the catalyst effect of NdxCo2-xZr2O7on the thermal decomposition of ammonium perchlorate (AP) using DSC (Differential scanning calorimetry). The results showed that nano NdxCo2-xZr2O7had high catalytic activity during on the thermal decomposition of ammonium perchlorate. With 2% more nano NdxCo2-xZr2O7, the peak temperature of AP thermal decomposition reaction dropped by nearly 88°C. The apparent decomposition reaction heat increased from 655J•g-1to 1073J•g-1. The results showed that the catalytic effect of thermal decomposition of AP with nano cobalt-doped zirconium acid neodymium is better than the single component of nano-metal oxides and undoped zirconate neodymium nanocrystals.

Symmetry of piezoelectric (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3(x=0.31) single crystal at different length scales in the morphotropic phase boundary region

We use probes of three different length scales to examine symmetry of ($1\ensuremath{-}x$)Pb(Mg${}_{1/3}$Nb${}_{2/3}$)O${}_{3}$-$x$PbTiO${}_{3}$ (PMN-$x$PT) single crystals in the morphotropic phase boundary (MPB) region at composition $x$ $=$ 0.31 (PMN-31$%$ PT). On the macroscopic scale, x-ray diffraction (XRD) shows a mixture of strong and weak diffraction peaks of different widths. The closest match to XRD peak data is made with monoclinic $Pm$ (M${}_{\mathrm{C}}$) symmetry. On the local scale of a few nanometers, convergent beam electron diffraction (CBED) studies, with a 1.6-nm electron probe, reveal no obvious symmetry. These CBED experimental patterns can be approximately matched with simulations based on monoclinic symmetry, which suggests locally distorted monoclinic structure. A monoclinic $Cm$ (M${}_{\mathrm{A}}$ or M${}_{\mathrm{B}}$)-like symmetry could also be obtained from certain regions of the crystal by using a larger electron probe size of several tens of nanometers in diameter. Thus the monoclinic symmetry of single crystal PMN-31$%$PT is developed only in parts of the crystal by averaging over locally distorted structure on the scale of few tens of nanometers. The macroscopic symmetry observed by XRD is a result of averaging from the local structure in PMN-31$%$PT single crystal. The lack of local symmetry at a few nanometers scale suggests that the polarization switching results from a change in local displacements, which are not restricted to specific symmetry planes or directions.

올방개 괴경 전분의 이화학적 특성

본 연구는 다년생 잡초인 올방개 괴경의 전분에 관한 이화학적 특성을 알아보기 위하여 수행되었다. 올방개 괴경 분말의 호화 점도 특성은 최고점도 5,679, 강하점도 426이었고, 괴경 전분의 호화 개시온도는 <TEX>$64.1^{\circ}C$</TEX>로 낮았으며 최종온도는 <TEX>$72.3^{\circ}C$</TEX>이었다. 전분입자의 X-ray 회절각은 <TEX>$15.18^{\circ}$</TEX>, <TEX>$17.13^{\circ}$</TEX>, <TEX>$23.1^{\circ}$</TEX>에서 강한 피크를 보였으며, <TEX>$18.1^{\circ}$</TEX>, <TEX>$20.06^{\circ}$</TEX>, <TEX>$26.69^{\circ}$</TEX>에서 약한 피크를 보였다. 올방개 괴경 전분의 결정화율은 28.6%이고 괴경 전분 입자의 모양은 둥글면서 부분적으로 눌린형태였으며 평균 입자 크기는 <TEX>$21.5{\mu}m$</TEX>이었다. The physicochemical properties of tuber starch in water chestnut have been studied. Peak viscosity, hot paste viscosity and cooling peak viscosity were 5679, 3146 and 4262 RVU, respectively. In three transition parameters, onset temperature (<TEX>$T_o$</TEX>), peak temperature (<TEX>$T_p$</TEX>), and conclusion temperature (<TEX>$T_c$</TEX>) were 64.1, 68.5 and <TEX>$72.3^{\circ}C$</TEX>, respectively. Gelatinization enthalpy (<TEX>${\Delta}H$</TEX> gel) was 4.48 J/g. A-type starch has a smaller proportion (11.4%) of short chains (<TEX>$DP{\geq}12$</TEX>) and a larger proportion (57.2%) of short chains (<TEX>$13{\leq}DP{\geq}24$</TEX>). The tuber starch of water chestnut displayed an A-type X-ray diffraction pattern showing a strong diffraction peak at <TEX>$2{\Theta}$</TEX> values of <TEX>$15.18^{\circ}$</TEX>, <TEX>$17.13^{\circ}$</TEX>, and <TEX>$23.1^{\circ}$</TEX>, and a weak peak at <TEX>$2{\Theta}$</TEX> values of <TEX>$18.1^{\circ}$</TEX>, <TEX>$20.06^{\circ}$</TEX>, and <TEX>$26.69^{\circ}$</TEX>. Their crystallinity was 28.6% and the mean starch granule size was 21.5 <TEX>${\mu}m$</TEX>.

The characterization of polyacrylonitrile fibers stabilized by electron beam irradiation

This study investigates polyacrylonitile(PAN) fibers stabilized with various doses of electron beam irradiation (EBI) ability to produce carbon fibers. Feasibility was verified by FT-IR, the percent of gel fraction, density, DSC, XRD, and mechanical measurements. FT-IR spectra showed that the intensities of the stretching C≡N bonds decreased at 2,244 cm−1 with increasing EBI dose. This de crease was related to cyclization of nitrile groups during EBI-stabilization. The degree of cyclization was determined from the gel fraction and density tests. The gel content and density of PAN fibers stabilized by EBI increased with an increase in the EBI dose. Thermal properties were characterized by differential scanning calorimetry (DSC) and thermally activated reactions. DSC curves showed that EBI treatment influenced the quantity of released heat and the exothermic position at low temperature over a wide temperature range. The strongest diffraction peak from the PAN precursor fiber arose from the (100) plane; its stabilization index (SI) was evaluated by X-ray diffraction. The X-ray results showed that the peak intensity decreases gradually with increasing EBI dose. In addition, tensile strength decreased the EBI stabilization level.

Influence of thermal annealing temperature on electro-optical properties of polyoctylfluorene thin film: Enhancement of luminescence by self-doping effect of low-content α phase crystallites

As spin-coating polyoctylfluorene (PFO) thin films were thermally annealed at various temperatures and their photoluminescence, electroluminescence and crystalline nanostructure was characterized. α phase PFO generate when annealing temperature reaches 80 °C and the performance of corresponding electroluminescence device was dramatically enhanced due to the self-doping effect. As the annealing temperature increases, the photoluminescence and electroluminescence decrease. Both in out-of-plane and in-plane grazing incident X-ray diffraction pattern the PFO thin film annealed at higher temperature has stronger diffraction peaks, indicating higher degree of crystallinity. The formation of vacancy defects and increase of interface roughness in crystalline process is considered as the reason for the reduction of luminescence. These results show that the electro-optical properties of PFO can be enhanced through controlling annealing temperature to form α phase PFO in low degree of crystallinity.

Effect of Tin Composition on Cu&lt;sub&gt;2&lt;/sub&gt;ZnSnS&lt;sub&gt;4&lt;/sub&gt; Photovoltaic Absorbers

Cu2ZnSnS4 (CZTS) thin films are prepared by sulfurizing the precursors deposited by vacuum evaporation methods. The samples sulfurized at 500°C for 3h shows the strong (112) diffraction peak at 28.45˚, suggesting the successful synthesis of CZTS thin films. The X-ray diffraction shows that CZTS thin film prepared in Sn-poor condition have the best crystallinity. The Sn-dependent crystallite size was calculated to be 19.53-21.03 nm. In addition, we found that the optical band gap with various Sn contents can be modulated at 1.48-1.85 eV

The surfactant-assisted Ni–Al2O3 catalyst prepared by a homogeneous precipitation method for CH4 steam reforming

The surfactant-assisted Ni–Al2O3 catalysts are prepared by the homogeneous precipitation method with a surfactant/Al molar ratio ranging from 0.0 to 2.0. It has been investigated the effects of the surfactant on the physicochemical properties and the catalytic activities of the Ni–Al2O3 catalysts. The BET surface area of the catalysts decreases with increasing the surfactant content. The pore volume and pore size of the catalysts increase with increasing the surfactant content. XRD results indicate that all of the catalysts exhibit strong diffraction peaks corresponding to NiO and weak peaks corresponding to NiAl2O4. In the TPR results, the reduction peaks which indicates that the Ni particles strongly interacted with the support are present at between 668 and 688 °C. The activities of the prepared catalysts for methane steam reforming increase with increasing surfactant content in fresh and poisoned state due to an increase of pore volume and pore size.

Influence of thickness and annealing temperature on the electrical, optical and structural properties of AZO thin films

Transparent conductive Al-doped ZnO (AZO) thin films with various thicknesses between 520 and 1420 nm were deposited on quartz substrates by radio frequency (RF) magnetron sputtering at room temperature for thin film solar cells as transparent conductive oxide (TCO) electrode layers. After deposition, the samples were annealed in a vacuum ambient at temperatures between 250 and 550 °C for a period of 30 min. The structural, electrical, and optical properties of these films have been analyzed as a function of the thickness and the annealing temperature by a series of characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), Hall effect measurements and spectrophotometry. All of these samples exhibited strong (002) diffraction peaks and the visible range transmittance was over 80%. In addition, with the increase of thickness, the Hall mobility increased from 4.88 to 7.86 cm2/V, the resistivity decreased from 1.2 × 10−2 Ω cm to 4.2 × 10−3 Ω cm. Annealing in vacuum improved the crystallinity together with some changes of the electrical resistance that depended on the annealing temperature. The best characteristics have been obtained at 450 °C, where the lowest resistivity was 2.7 × 10−3 Ω cm for the thickest films.

Preparation of strontium ferrite from strontium residue

Strontium ferrite was prepared from Strontium Waste Residue (SWR) as a material. Strontium chloride was obtained by leaching SWR with ammonia chloride, and then SrCl2 was converted to SrCO3. Strontium ferrite (SrFe12O19) was formed by roasting the mixture of SrCO3 and FeCl3 in a proper proportion. The structure and magnetic susceptibility of strontium ferrite were investigated. The results showed that strontium conversion ratio increased with decreasing SWR grain diameter. The largest ratio was presented when n(NH4Cl/Sr) was 3.6. What is more, the conversion process coincided with the kinetic characteristics of fractal reaction. The magnetic susceptibility of strontium ferrite decreased with increasing Fe3+/Sr2+ mole ratio and pH. SrFe12O19 exhibited face-centered and cubic closely-packed hexagonal structures. There were the strong diffraction peaks of Fe2O3 in the X-ray diffractogram of strontium ferrite. Strontium recovery ratio was 87.0%.