scholarly journals Grain Size Effect on Electrical and Magnetotransport Properties of La0.67Ca0.33MnO3 synthesized via Sol-Gel Method

2018 ◽  
Vol 1083 ◽  
pp. 012059
Author(s):  
K. P. Lim ◽  
S. A. Halim ◽  
S.K. Chen ◽  
M. M. Awang Kechik ◽  
S. W. Ng ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sol Gel ◽  
Grain Size Effect ◽  
Gel Method ◽  
Sol Gel Method

Grain size effect on the dielectric and non-ohmic properties of CaCu3Ti4O12 ceramics prepared by the sol-gel process

2019 ◽  
Vol 778 ◽  
pp. 625-632 ◽  
Author(s):  
Pu Mao ◽  
Jiping Wang ◽  
Shujuan Liu ◽  
Lixue Zhang ◽  
Yingying Zhao ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sol Gel ◽  
Grain Size Effect ◽  
Sol Gel Process

scholarly journals The Influence of Annealing Temperature on the Structure and Magnetic Properties of Nanocrystalline BiFeO3 Prepared by Sol–Gel Method

2021 ◽  
Author(s):  
T. Pikula ◽  
T. Szumiata ◽  
K. Siedliska ◽  
V. I. Mitsiuk ◽  
R. Panek ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Weak Ferromagnetism ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Average Grain Size ◽  
Spin Cycloid

AbstractIn this work, BiFeO3 powders were synthesized by a sol–gel method. The influence of annealing temperature on the structure and magnetic properties of the samples has been discussed. X-ray diffraction studies showed that the purest phase was formed in the temperature range of 400 °C to 550 °C and the samples annealed at a temperature below 550 °C were of nanocrystalline character. Mössbauer spectroscopy and magnetization measurements were used as complementary methods to investigate the magnetic state of the samples. In particular, the appearance of weak ferromagnetic properties, significant growth of magnetization, and spin-glass-like behavior were observed along with the drop of average grain size. Mössbauer spectra were fitted by the model assuming cycloidal modulation of spins arrangement and properties of the spin cycloid were determined and analyzed. Most importantly, it was proved that the spin cycloid does not disappear even in the case of the samples with a particle size well below the cycloid modulation period λ = 62 nm. Furthermore, the cycloid becomes more anharmonic as the grain size decreases. The possible origination of weak ferromagnetism of the nanocrystalline samples has also been discussed.

Synthesis Processes of Nano Alumina Abrasive

2008 ◽  
Vol 368-372 ◽  
pp. 691-693 ◽  
Author(s):  
Zi Cheng Li ◽  
Zhi Hong Li ◽  
Ai Ju Zhang ◽  
Yu Mei Zhu
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Sol Gel ◽  
Precipitation Method ◽  
Pressureless Sintering ◽  
Gel Method ◽  
Sol Gel Method ◽  
Uniform Microstructure ◽  
Nano Alumina ◽  
Average Grain Size

Synthesis processes of nano alumina abrasive precursor using precipitation method and sol-gel method were investigated in this study. Using pressureless sintering, the nano alumina abrasive was prepared. Mechanical properties of the samples were measured by using single particle compressive strength tester. The microstructures of them were examined by using field emission scanning electron microscopy (FESEM). The results indicated that the performance and microstructure of the samples are greatly relative to the synthesis processes. Compared with samples prepared by precipitation method, the samples prepared by sol-gel method have higher compressive strength, smaller grain size and more uniform microstructure. The average grain size of the alumina abrasive was below 100nm.

Synthesis and Characterization of Nanocrystalline PZT Powders by a Simple Sol-Gel Method

2012 ◽  
Vol 512-515 ◽  
pp. 147-152
Author(s):  
Shao Peng Zhang ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Grain Size ◽  
Lead Zirconate Titanate ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Average Grain Size

Nanocrystalline lead zirconate titanate (PZT) powders with composition at the morphotropic phase boundary (MPB) were synthesized by a simple aqueous based sol-gel method, using lead nitrate, zirconium nitrate and tetrabutyl titanate as the starting materials. The sol could be easily transformed into gel, firstly heated at 120°C for 10h, then at 180°C for 24h. The thermal decomposition process of the gel was investigated by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The effect of citrate addition amount on the calcining temperature was discussed. The results reveal that pure perovskite phase PZT powders can be obtained at a calcining temperature as low as 600°C. The average grain size of the powders was determined by transmission electron microscope and X-ray diffraction. The influences of calcining temperature and the pH value of the solution on the grain size were investigated. The sintering temperature and electrical properties of the ceramics derived by nano-powders were compared with those prepared by the conventional ceramic processing. The result shows that using the nanopowder, the sintering temperature could be reduced by about 100°C and the ferroelectric properties were enhanced.

Synthesis of Mg2+ and Al3+ Co-Doped Li3V2(PO4)3/C Powder

2012 ◽  
Vol 624 ◽  
pp. 204-207
Author(s):  
Qian Yang ◽  
Lei Zhang ◽  
Yan Gai Liu ◽  
Zhao Hui Huang ◽  
Ming Hao Fang
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Doping ◽  
Before And After ◽  
Ft Ir ◽  
Ir Analysis ◽  
Co Doped

Mg2+2+,Al3+ Co-doped Li3V2(PO4)3/C powder was synthesized by sol-gel method under nitrogen. The crystal structure and micrograph ofLi3V2(PO4)3/C powder before and after doping was investigated by XRD, SEM and FT-IR. The effect of Mg2+/Al3+ Co-doping onLi3V2(PO4)3/C powder was discussed. The results indicated that Mg2+2+,Al3+ Co-doping did not change the crystal structure of Li3V2(PO4)3, but decreased the grain size of the as-synthesized powder. The FT-IR analysis indicated that weak Al-O bond was generated after doping.

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