ChemInform Abstract: Grain-Boundary Effect in Ceria Doped with Trivalent Cations. Part 1. Electrical Measurements. Part 2. Microstructure and Microanalysis.

1986 ◽  
Vol 17 (48) ◽  
Author(s):  
R. GERHARDT ◽  
A. S. NOWICK ◽  
M. E. MOCHEL ◽  
I. DUMLER
Keyword(s):  
Grain Boundary ◽  
Boundary Effect ◽  
Electrical Measurements ◽  
Trivalent Cations ◽  
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

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

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.

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