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It can be observed from Fig 3 thatthe agglomeration is increasing with an increasing lanthanum ion concentration [48, 63]. Besides that, the larger ionic radius of lanthanum ion could attribute to the increase in grain size which occupy on the grain boundary on the outlay of cations vacancies in the lattice [64]. However, the average crystallite sizes of the substituted ferrite samples obtained from XRD analysis are significantly smaller than the values determined by FESEM analysis. ABSTRACT: Lanthanum substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5LaxFe1-xO4; 0.00 ≤x≤ 1.00) synthesized by sol-gel method were presented. X-ray diffraction patterns reveal the typical single phase spinel cubic ferrite structure, with the traces of secondary phase for lanthanum substituted nanocrystals. In addition, the structural analysis also demonstrates that the average crystallite size varied in the range of 21–25 nm. FTIR spectra present the two prominent absorption bands in the range of 400 to 600 cm?? which are the fingerprint region of all ferrites. Surface morphology of both substituted and unsubstituted Ni-Zn ferrite nanoparticle samples was studied using FESEM technique and it indicates a significant increase in the size of spherical shaped particles with La?? substitution. Magnetic properties of all samples were analyzed using vibrating sample magnetometer (VSM). The results revealed that saturation magnetization (Ms) and coercivity (Hc) of La?? substituted samples has decreased as compared to the Ni-Zn ferrite samples. Hence, the observed results affirm that the lanthanum ion substitution has greatly influenced the structural, morphology and magnetic properties of Ni-Zn ferrite nanoparticles. Full-text · Article · Jan 2017 They play vital role in microwave latching devices, magnetic switching circuits and also used as cathode material in lithium batteries. Numerous researchers have reported the impactof magnetic and non-magnetic substitution in copper ferrite on their various properties [7][8][9][10][11][12]. Various synthetic approaches have been pursued to prepare Cu ferrite with different sintering temperature, particle size and microstructure features including micro emulsion technique [13], hydrothermal method [14], sol-gel [1], combustion method [15], sonochemical method [16] and chemical co-precipitation method [17]. ABSTRACT: Lithium substituted copper ferrite (LixCu(1-x)Fe2O4) nanoparticles have been successfully synthesized by chemical co-precipitation method. XRD analysis confirms the formation of Li substituted Cu ferrite with crystallite size in the range of 17–41 nm. The SEM and TEM microstructure of nanoparticle is well characterized and fine nature improves while increasing of Li concentration and also FTIR analysis exhibit the usual behaviour of ferrite materials. The dielectric properties of the material are increased with increase of concentration. The hysteresis loop is increased which is evident from the increase of saturation magnetization which implies that soft magnetic material has altered into hard magnetic materialArticle · Nov 2016 ) confirm the formation of single phase cubic spinel ferrites. Similar diffraction peaks have been reported for cubic spinel ferrites in literature by other researchers [15] [16]. Table 1 shows the lattice constant, cell volume, X-ray density , bulk density and crystallite size of Li 0.5 Co 0.5 Nd x Fe 2?x O 4 (x = 0.0, 0.035, 0.070, 0.105, 0.140, 0.175) nanocrystalline ferrites. ABSTRACT: Nano-crystalline Li0.5Co0.5NdxFe2-xO4 (x = 0.0, 0.035, 0.070, 0.105, 0.140, 0.175) ferrites have been synthesized via micro-emulsion technique. Thermal analysis, fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), magnetometer analysis and a.c. electrical studies are employed to observe the impact of Nd3+ doping in Li0.5Co0.5Fe2O4 on crystallite size, spectral bands, dielectric and magnetic parameters. Thermal analysis depicts the weight loss with various temperatures and it illustrates that there is no further weight loss above 950 °C. XRD analysis establishes the formation of single phase cubic spinel structure. Although for x = 0.0 and thereafter for x ? 0.035 a peak of second phase (NdFeO3) occurs. The XRD data analysis revealed that the Nd substituted Li0.5Co0.5Fe2O4 ferrites revealed crystallite size 52.02–106 nm ranges. The lattice parameter and crystallite size show a nonlinear behavior. The FTIR data between 400 and 1000 cm-1 defined the intrinsic cation vibrations of the characteristic spinel structure. The dielectric parameters are investigated in the range of 1 MHz–3 GHz frequency. A damping effect in the dielectric parameters is observed by Nd3+ incorporation and also by increasing the frequency. Magnetic measurements at room temperature exhibit an appreciable increase in the saturation magnetization and coercivity with the substitution of Nd3+ cations. Coercivity is in range of soft ferrite. The dominating effects of doping on dielectric properties propose that these nano-ferrites are useful in the fabrication of high frequency devices, whereas increase in magnetization and coercivity propose the use for high density recoding media.Article · Aug 2015 +1 more author...Consequently 950 o C is sufficient for annealing process and no more annealing is needed beyond this temperature. literature by other researchers [15, 16].Table 1 shows the lattice constant, cell volume, x-ray density, bulk density and crystallite size of Li 0.5 Co 0.5 Nd x Fe 2-x O 4 (x=0.0, 0.035, 0.070, 0.105, 0.140, 0.175) nanocrystalline ferrites.
Full-text · Article · Mar 2015 · Applied Science LettersABSTRACT: For the first time, we report the successful synthesis of novel nanoparticle-sheathed bipyramid-like and almond-like Fe0.5R0.5(MoO4)1.5:Ln3+ (R = Gd3+, La3+), (Ln = Eu, Tb, Dy) 3D hierarchical microstructures through a simple disodium ethylenediaminetetraacetic acid (Na2EDTA) facilitated hydrothermal method. Interestingly, time-dependent experiments confirm that the assembly-disassembly process is responsible for the formation of self-aggregated 3D architectures via Ostwald ripening phenomena. The resultant products are characterized by x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), photoluminescence (PL), and magnetic measurements. The growth and formation mechanisms of the self-assembled 3D micro structures are discussed in detail. To confirm the presence of all the elements in the microstructure, the energy loss induced by the K, L shell electron ionization is observed in order to map the Fe, Gd, Mo, O, and Eu components. The photo luminescence properties of Fe0.5R0.5(MoO4)1.5 doped with Eu3+, Tb3+, Dy3+ are investigated. The room temperature and low temperature magnetic properties suggest that the interaction between the local-fields introduced by the magnetic Fe3+ ions and the R3+ (La, Gd) ions in the dodecahedral sites determine the magnetism in Fe0.5R0.5(MoO4)1.5:Eu3+. This work provides a new approach to synthesizing the novel Fe0.5R0.5(MoO4)1.5:Ln3+ for bi-functional magnetic and luminescence applications.Article · Jan 2015
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怎么画出y=0.5x的图像
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Y=0.5X是正比例函数,图象是一条直线由于两点确定一条直线,因此只要在函数图象上确定两个点就可以了代入X=0,则Y=0,得到图象上第一个点（0,0）代入X=2,则Y=1,得到第二个点（2,1）过这两点做一条直线,就是是函数图象
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