Mixed conduction and grain boundary effect in lithium niobate under high pressure

2015 ◽  
Vol 106 (13) ◽  
pp. 132902 ◽  
Author(s):  
Qinglin Wang ◽  
Cailong Liu ◽  
Yang Gao ◽  
Yanzhang Ma ◽  
Yonghao Han ◽  
...  
Keyword(s):  
High Pressure ◽  
Lithium Niobate ◽  
Grain Boundary ◽  
Boundary Effect ◽  
Mixed Conduction ◽  
Grain Boundary Effect

Grain boundary effect on the β-boron electrical transport properties at high pressure

2010 ◽  
Vol 97 (17) ◽  
pp. 174101 ◽  
Author(s):  
Ming Li ◽  
Jie Yang ◽  
Karim Snoussi ◽  
Lixin Li ◽  
Huixin Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Grain Boundary ◽  
Transport Properties ◽  
Electrical Transport ◽  
Boundary Effect ◽  
Electrical Transport Properties ◽  
Grain Boundary Effect

scholarly journals Improved Dielectric Properties and Grain Boundary Effect of Phenanthrene Under High Pressure

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaofeng Wang ◽  
Qinglin Wang ◽  
Tianru Qin ◽  
Guozhao Zhang ◽  
Haiwa Zhang ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Grain Boundary ◽  
Theoretical Calculations ◽  
Dominant Role ◽  
Boundary Effect ◽  
Structural Phase ◽  
Intramolecular Interactions ◽  
Dielectric Performance ◽  
Grain Boundary Effect

In situ impedance measurements, Raman measurements and theoretical calculations were performed to investigate the electrical transport and vibrational properties of polycrystalline phenanthrene. Two phase transitions were observed in the Raman spectra at 2.3 and 5.9 GPa, while phenanthrene transformed into an amorphous phase above 12.1 GPa. Three discontinuous changes in bulk and grain boundary resistance and relaxation frequency with pressure were attributed to the structural phase transitions. Grain boundaries were found to play a dominant role in the carrier transport process of phenanthrene. The dielectric performance of phenanthrene was effectively improved by pressure. A significant mismatch between Z″ and M″ peaks was observed, which was attributed to the localized electronic conduction in phenanthrene. Theoretical calculations showed that the intramolecular interactions were enhanced under compression. This study offers new insight into the electrical properties as well as grain boundary effect in organic semiconductors at high pressure.

Grain boundary effects in NTC-PTC composite thermistor materials

1999 ◽  
Vol 14 (1) ◽  
pp. 120-123 ◽  
Author(s):  
D. J. Wang ◽  
J. Qiu ◽  
Y. C. Guo ◽  
Z. L. Gui ◽  
L. T. Li
Keyword(s):  
Energy Level ◽  
Grain Boundary ◽  
Boundary Effect ◽  
Complex Impedance ◽  
Negative Temperature ◽  
Impedance Analysis ◽  
Composite Effect ◽  
Complex Impedance Analysis ◽  
Temperature Coefficient Of Resistivity ◽  
Grain Boundary Effect

Yttrium-doped (Sr0.45Pb0.55)TiO3 ceramics have been studied by complex impedance analysis. As a sort of NTC-PTC composite thermistor, it exhibited a significantly large negative temperature coefficient of resistivity below Tc in addition to the ordinary PTC characteristics above Tc. It is found that the NTC effect in NTC-PTC materials was not originated from the deep energy level of donor (bulk behavior), but from the electrical behavior of the grain boundary. Therefore, the NTC-PTC composite effect was assumed to be a grain boundary effect, and yttrium was a donor at shallow energy level. The NTC-PTC ceramics were grain boundary controlled materials.

scholarly journals Grain Boundary Effect on Diffusion of Hydrogen in Pure Aluminum

1991 ◽  
Vol 32 (12) ◽  
pp. 1109-1114 ◽  
Author(s):  
Minoru Ichimura ◽  
Yasushi Sasajima ◽  
Mamoru Imabayashi
Keyword(s):  
Grain Boundary ◽  
Boundary Effect ◽  
Pure Aluminum ◽  
Diffusion Of Hydrogen ◽  
Grain Boundary Effect

Grain-boundary effect in zirconia stabilized with yttria and calcia by electrical measurements

2003 ◽  
Vol 103 (2) ◽  
pp. 108-114 ◽  
Author(s):  
Ying Li ◽  
Mingshuai Liu ◽  
Jianghong Gong ◽  
Yunfa Chen ◽  
Zilong Tang ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Effect ◽  
Electrical Measurements ◽  
Grain Boundary Effect
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