Transport properties and dielectric response of Pr0.8Na0.2-xKxMnO3 (x = 0, 0.05, 0.1, 0.15 and 0.2) ceramics synthesized by sol–gel method

2021 ◽  
Vol 127 (8) ◽  
Author(s):  
I. Ouni ◽  
H. Ben Khlifa ◽  
R. M’nassri ◽  
Muaffaq. M. Nofal ◽  
Elham M. A. Dannoun ◽  
...  
2004 ◽  
Vol 49 (1) ◽  
pp. 137-142
Author(s):  
A. V. Shil’nikov ◽  
R. A. Laletin ◽  
A. I. Burkhanov ◽  
A. S. Sigov ◽  
K. A. Vorotilov

RSC Advances ◽  
2019 ◽  
Vol 9 (60) ◽  
pp. 35280-35288 ◽  
Author(s):  
Xingming Zhao ◽  
Tianlin Wang ◽  
Songchol Hong ◽  
Dalu Sun ◽  
Nan Wang ◽  
...  

Bi2212 superconductors with crystallization treatments at different temperatures were prepared by the Pechini sol–gel method, and their structural, thermal and transport properties were investigated.


2011 ◽  
Vol 8 (s1) ◽  
pp. S189-S194 ◽  
Author(s):  
Yong-Qing Zhai ◽  
Jing Qiao ◽  
Zhang Zhang

With activated carbon for reducing agent, the sol-gel method was used to prepare the giant magnetoresistance materials Sr2FeMoO6, which is the double Perovskite oxide. The structure, morphology, magnetic and electrical transport properties were investigated respectively by x-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. The as-synthesized sample is Sr2FeMoO6with tetragonal crystal structure and I4/mmm space group and unit cell parameter is a = 5.580Å, c = 7.882Å. The primary particles are spherical in shape and the grain size is below 100 nm. The curie temperature is above room temperature and the saturation magnetization is 13.321 A·m2/kg under 1.0 T at room temperature. The sample exhibit typical semiconductor behavior and the conductive mechanism can be described by small polaron variable range hopping model. The room temperature magnetoresistance of the sample under 1.0 T field is up to -10.02%. Moreover, it is found the dosage of citric acid and the amount of reducing agent has great effect on the phase structure and magnetic properties of the samples.


2011 ◽  
Vol 71-78 ◽  
pp. 959-962
Author(s):  
Xiao Ling Qi ◽  
Ling Ke Zeng ◽  
You Yu Fan

Polycrystalline Ca3-xMgxCo4O9(x=0-0.3)ceramics were prepared by the sol–gel method combined with the ordinary pressing sintering and the thermal conductivities were measured from room temperature to 673 K. The influence of Mg2+ substitution for Ca2+ on the thermal conductivities of Ca3Co4O9 ceramics was investigated systematically. The influence of Mg doping on the thermal conductivities is mainly embodied in the lattice thermal conductivities, which shows a significant decrease with the increase of the dopant content for the samples with x ≤ 0.2, while the carrier thermal conductivity had no obvious change with Mg doping increasing. These results indicated that the thermal conductivities of the material could be reduced remarkably with the substitution of Mg from 1.427 W/m·K to 0.731 W/m·K at 573 K with x = 0.2.


2021 ◽  
Vol 860 ◽  
pp. 158327
Author(s):  
E.A. Bikyashev ◽  
S.P. Kubrin ◽  
A.V. Popov ◽  
A.V. Pavlenko ◽  
I.P. Raevski ◽  
...  

2015 ◽  
Vol 41 ◽  
pp. S381-S386 ◽  
Author(s):  
Danyan Cao ◽  
Yuanyuan Zhang ◽  
Wenxia Dong ◽  
Jing Yang ◽  
Wei Bai ◽  
...  

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