Effect of Wood Template on Magnetic Properties of Ni0.5Zn0.5Fe2-xCrxO4 Ceramics

2019 ◽  
Vol 956 ◽  
pp. 107-113
Author(s):  
Rui Li ◽  
Liang Cun Qian ◽  
Xue Feng Sun
Keyword(s):  
Grain Size ◽  
Saturation Magnetization ◽  
Spinel Structure ◽  
Single Phase ◽  
Sol Gel ◽  
Porous Ceramics ◽  
Nanocrystalline Powders ◽  
Test Results ◽  
Doping Amount ◽  
Wood Template

Porous Ni0.5Zn0.5Fe2-xCrxO4 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) ceramics were prepared by a sol-gel method using basswood as the mold. At the same time, Ni0.5Zn0.5Fe2-xCrxO4 nanocrystalline powders were obtained by sintering the gel in oxygen at high temperature. The result of the XRD test showed that all samples presented the single-phase of the cubic spinel structure. With the increase of doping amount x, both porous ceramics and nanopowders decreased their grain size; At the same doping amount, the grain size of powder ferrites was about twice as large as that of porous ceramics. The magnetic test results showed that with the increase of doping amount x, the coercivity values increased monotonously and the saturation magnetization values decreased monotonously for all samples. Under the same doping content, the saturation magnetization values were lower but the coercivity values were higher as compared to the powder ferrites.

Structural, morphological and magnetic properties of Mn2+ ions substituted nanosized nickel–copper–cobalt ferrites through sol–gel auto-combustion method

2019 ◽  
Vol 34 (01) ◽  
pp. 2050002
Author(s):  
Wei Zhang ◽  
Aimin Sun ◽  
Xiqian Zhao ◽  
Xiaoguang Pan ◽  
Yingqiang Han
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Spinel Structure ◽  
Remanent Magnetization ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Combustion Method ◽  
Magnetic Data ◽  
Nickel Copper ◽  
Auto Combustion

Manganese substituted nickel–copper–cobalt ferrite nanoparticles having the basic composition [Formula: see text] (x = 0.0, 0.1, 0.2, 0.3 and 0.4) were synthesized by sol–gel auto-combustion method. X-ray diffraction (XRD) was used to estimate phase purity and lattice symmetry. All the prepared samples show the single-phase cubic spinel structure. Fourier transform infrared (FTIR) measurements also confirm the cubic spinel structure of the ferrite that is formed. The preparation of samples show these nearly spherical particles by Transmission electron microscopy (TEM). The magnetic properties of Mn[Formula: see text] ion substituted in nickel–copper–cobalt ferrite were studied by Vibrating sample magnetometer (VSM). The saturation magnetization ([Formula: see text]), remanent magnetization [Formula: see text], coercivity [Formula: see text], magnetic moment [Formula: see text] and anisotropy constant [Formula: see text] first increase and then decrease with the increase of [Formula: see text] ions content. They had better magnetism than pure sample and other substituted samples when the substitution amount of [Formula: see text] ions was [Formula: see text]. At [Formula: see text], the maximum values of remanent magnetization [Formula: see text], saturation magnetization [Formula: see text] and coercivity [Formula: see text] are 25.58 emu/g, 61.95 emu/g and 689.76 Oe, respectively. This indicates that the magnetism of ferrite can improve by substituting with the appropriate amount of manganese. However, due to the excess [Formula: see text] ions instead, ferrite magnetism is weakened. This means that these materials can be used in magnetic data storage and recording media.

Effect of Substituting Sr2+ for Gd3+ on Structural and Magnetoelectric Properties of W-Type Hexaferrite

2014 ◽  
Vol 975 ◽  
pp. 268-273
Author(s):  
Bruna da Costa Andrade ◽  
Marcelo Andrade Macedo
Keyword(s):  
Saturation Magnetization ◽  
Coercive Field ◽  
Single Phase ◽  
Sol Gel ◽  
Remnant Magnetization ◽  
High Saturation Magnetization ◽  
Electron Conduction ◽  
Magnetoelectric Properties ◽  
High Saturation ◽  
Sol Gel Process

Sr1-xGdxCo2Fe16O27-δ, (x = 0.05–0.20) was prepared via the proteic sol-gel process. Single-phase W-type hexaferrite doped with gadolinium was synthesized. The ferrite shows ferrimagnetic behavior with high saturation magnetization, low coercive field, low remnant magnetization, and a resistivity greater than 107 Ω·cm. The substitution of Sr2+ for Gd3+ improved the magnetoelectric properties of the ferrite owing to the increase in the concentration of Fe2+ and improvement of electron conduction.

Magnetization Evolution with Hole Doping Level in (Sr2-xNax)FeMoO6

2011 ◽  
Vol 239-242 ◽  
pp. 3165-3168
Author(s):  
Qin Zhang ◽  
Chang Li ◽  
Zhen Feng Xu ◽  
Ke Yan Wang
Keyword(s):  
Crystal Structure ◽  
Saturation Magnetization ◽  
Doping Level ◽  
Single Phase ◽  
Sol Gel ◽  
Double Perovskite ◽  
Hole Doping ◽  
Cation Ordering ◽  
Xrd Pattern ◽  
Method Effects

Hole doped double perovskite compounds (Sr, Na)2FeMoO6 with the Na content of x = 0, 0.02, 0.03, 0.07 and 0.17 have been synthesized by sol-gel method. Effects of hole doping on the crystal structure and magnetic properties of Sr2FeMoO6 have been investigated. XRD pattern indicates that all the samples are of single phase and belong to the space group I4/m. The degree of cation ordering in the Na-doped Sr2FeMoO6 compounds shows a non-monotonic variation with the doping level. The saturation magnetization of the compound increases with x for x<0.17. Similar to the electron doped Sr2FeMoO6, provided that the doped hole enters selectively the spin-down band, the variation of the saturation magnetization can be explained in light of the ferrimagnetic model (FIM).

scholarly journals Structure and Magnetic Properties ofY3−xErxFe5O12(x=0.2,1.0, and 2.0) Thin Films Prepared by Sol-Gel Method

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Ramadan Shaiboub ◽  
Noor Baa'yah Ibrahim ◽  
Mustaffa Abdullah ◽  
Ftema Abdulhade
Keyword(s):  
Thin Films ◽  
Saturation Magnetization ◽  
Single Phase ◽  
Annealing Temperature ◽  
Magnetic Measurements ◽  
Sol Gel ◽  
Spin Effect ◽  
Gel Method ◽  
Sol Gel Method ◽  
Surface Spin

NanoparticlesY3−xErxFe5O12(x=0.2, 1.0, and 2.0) thin films were prepared by sol-gel method and treated at 800, 900, and 1000∘C, respectively, for 2 h. The films have single phase garnet structure and the sizes of particles are in the range of 44 to 83 nm. The magnetic measurements show that the saturation magnetization decreased with increasing of Er concentration for all samples treated at different annealing temperatures. The saturation magnetization increased with the particle size due to the enhancement of the surface spin effect. The coercivity initially decreased forx=1.0and then increased forx=2.0with increasing annealing temperature.

scholarly journals Effect of Cu Substitution on Magnetic Properties of Co0.6Ni0.4Fe2O4 Nanoferrites

2021 ◽  
Vol 12 (2) ◽  
pp. 1899-1906
Keyword(s):  
Grain Size ◽  
Spinel Structure ◽  
Sol Gel ◽  
Combustion Method ◽  
Lattice Parameter ◽  
Fesem Image ◽  
Absorption Bands ◽  
Cu Substitution ◽  
Ferrite Structure ◽  
Auto Combustion

This work is focusing on synthesizing the cobalt nanoferrite materials substituted by copper forming Co0.6Ni0.4-xCuxFe2O4 with x = 0.0, 0.1, and 0.3 using the sol-gel auto-combustion method. The phase analysis of XRD showed the spinel structure with the lattice parameter in the range 8.36-8.39 Å. FESEM image showed the grain size initially decreasing and then increasing with Cu concentration. The FTIR curve's two absorption bands in the specified range of frequency assured the spinel nano ferrite structure. The values of remanent ratios obtained from VSM showed their isotropic nature forming single domain ferrimagnetic particles.

Structure and Dielectric Properties of Mg, Cr-Doped LaSrFeO3 Films

2014 ◽  
Vol 538 ◽  
pp. 11-14
Author(s):  
Yang Lu Hou ◽  
Xing Hua Fu ◽  
Wen Hong Tao ◽  
Xin Jin
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Grain Size ◽  
Dielectric Properties ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Doping Amount ◽  
Single Perovskite Phase ◽  
Pure Perovskite Phase ◽  
Mg Doped

Mg-doped LaFeO3 thin film and Mg, Cr-doped La0.5Sr0.5FeO3 thin films were prepared by the sol-gel method. The change rules of structure and dielectric properties of the films were studied by XRD, SEM, and Agilent. The dielectric properties of La0.5Sr0.5FeO3 and LaFeO3 films were improved by the substitute with Mg and Cr. The doping amount of Mg and Cr for the optimal dielectric properties of La0.5Sr0.5FeO3 films is 45mol%, 25mol%, respectively, and for LaFeO3, the doping amount of Mg is 8mol%. The observed pure perovskite phase of the doped films suggested the dissolution of Mn, Co, and Ni in La0.5Sr0.5FeO3 crystal lattice. Mg and Cr were integrate in the lattice of LaFeO3 and La0.5Sr0.5FeO3, and mineral is single perovskite phase. The surface of the film is smooth, without cracks, surface grain size distribution and had uniform grain size.

Structure and Dielectric Properties of Mn, Co, and Ni-Doped LaSrFeO3 Films

2013 ◽  
Vol 575-576 ◽  
pp. 499-503
Author(s):  
Bin Fu ◽  
Yang Lu Hou ◽  
Wei Bing Wu ◽  
Xing Hua Fu
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Dielectric Properties ◽  
Smooth Surface ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Electrical Measurements ◽  
Doping Amount ◽  
Pure Perovskite Phase ◽  
Gel Technique

Mn, Co, and Ni-doped La0.5Sr0.5FeO3thin films were prepared by the sol-gel technique. The structure and dielectric properties of the films were studied by XRD, SEM, and electrical measurements. The morphology observation demonstrated these films had uniform grain size and smooth surface. The dielectric properties of La0.5Sr0.5FeO3films were improved by the replacement of Fe with Mn, Co, and Ni. The doping amount of Mn, Co, and Ni for the optimal dielectric properties of La0.5Sr0.5FeO3films is 5%, 2%, and 3%, respectively. The observed pure perovskite phase of the doped films suggested the dissolution of Mn, Co, and Ni in La0.5Sr0.5FeO3crystal lattice.

Synthesis of Bi4-xYbxTi3O12 Nanopowders by a Modified Sol-Gel Process

2007 ◽  
Vol 336-338 ◽  
pp. 2002-2004
Author(s):  
Xian Qun Chen ◽  
Qiu Sun ◽  
Hong Cheng Liu
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Bismuth Titanate ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Phase Changes ◽  
Nanocrystalline Powders ◽  
Temperature Phase ◽  
Cation Substitution ◽  
Sol Gel Process

Rare earth Yb-doped bismuth titanate Bi4-xYbxTi3O12 (BYT) nanocrystalline powders were obtained by a modified sol-gel method. TG-DTA, FI-IR and XRD were used to determine the lowest heat treatment temperature. Phase changes in the formation of BYT crystalline powders were discussed by XRD. The effect of Yb3+ cation substitution for Bi3+ cation on the microstructure of BYT was also developed with XRD. The grain size of BYT nanopowders is about 40 nm determined by TEM.

Co-Ferrite (CoFe2O4): A Material with High Magnetostriction Produced by Sol-Gel Method

2011 ◽  
Vol 326 ◽  
pp. 157-164
Author(s):  
Nasir Mehmood ◽  
Roland Grössinger ◽  
Rieko Sato Turtelli ◽  
Muhammad Aamir Raza ◽  
Sohail Afzal Khan ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Single Phase ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Xrd Pattern ◽  
Gel Method ◽  
Heat Treated ◽  
Different Temperatures ◽  
Phase Spinel

Polycrystalline Co-ferrite was produced by modified citrate gel method. Samples were afterward heat treated at different temperatures upto 1300°C. The XRD pattern shows that all samples exhibit a single phase spinel structure and improvement and sharpness in intensity of peaks with increasing annealing temperature. Measurement of hysteresis loops demonstrate that after the heat treatment a saturation magnetization of 60- 84 emu/gis obtained. Measurements of the longitudinal magnetostriction gave values between 20 ppm and 130 ppm. Magnetostriction increases gradually with increase in annealing temperature and becomes highest when the saturation magnetization values are larger.

Dielectric Properties of Zn-Doped CCTO Ceramics by Sol-Gel Method

2011 ◽  
Vol 197-198 ◽  
pp. 302-305 ◽  
Author(s):  
Dong Xu ◽  
Chen Zhang ◽  
Xiao Nong Cheng ◽  
Yuee Fan ◽  
Tao Yang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Single Phase ◽  
Sol Gel ◽  
Sharp Decrease ◽  
Dielectric Constants ◽  
Doping Amount ◽  
Xrd Pattern ◽  
Gel Method ◽  
Sol Gel Method

The CaCu3-xZnxTi4O12(CCZTO) (x=0, 0.06, 0.1, 0.2) ceramics were prepared by Sol–gel method. The XRD pattern shows that crystal structure of the sample with no Zn is basically single-phase. The SEM results indicate that the samples have porous structures and the gain size decreases with the content of Zn increasing. The dielectric properties of CCZTO were analyzed by Agilent 4294A. The experimental results show that the dielectric constants are less than that in other papers reported obviously because of their mesoporous structures. With the little doping amount(x=0.06, 0.1), a sharp decrease happened in the dielectric constant (εr). The higher εrwas found when x=0.2, but its dielectric loss (D) had greatly increased and frequency stability of dielectric property became worse. The uniformity of gains was put forward to explain the results which showed great impact on the dielectric constant.

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