Positive Temperature Coefficient of Electrical Resistivity below 150 K in Barium Strontium Titanate

2004 ◽  
Vol 87 (4) ◽  
pp. 756-758 ◽  
Author(s):  
Massimo Viviani ◽  
Marcello Leoni ◽  
Maria Teresa Buscaglia ◽  
Vincenzo Buscaglia ◽  
Paolo Nanni
Keyword(s):  
Electrical Resistivity ◽  
Temperature Coefficient ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Barium Strontium

Composite ceramics with a positive temperature coefficient of electrical resistivity effect

2000 ◽  
Vol 15 (2) ◽  
pp. 417-428 ◽  
Author(s):  
Darja Lisjak ◽  
Miha Drofenik ◽  
Drago Kolar
Keyword(s):  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Temperature Coefficient ◽  
Linear Thermal Expansion ◽  
Positive Temperature Coefficient ◽  
High Resistivity ◽  
Positive Temperature ◽  
Composite Ceramics ◽  
Ptcr Effect ◽  
Constituent Phase

Composite ceramics with compositions within the ZnO–NiO–TiO2, ZnO–MgO, and ZnO–Ln2O3 (Ln = Nd, Sm) systems were found to exhibit an anomalous positive temperature coefficient of electrical resistivity (PTCR) effect. The investigations revealed, that in all cases when the PTCR effect was identified, the composite ceramics were found to be composed of phases with different electrical resistivities and linear thermal expansion coefficients. Thermal mismatch between the phases in the composites leads to a disconnection of the grains of the low resistivity constituent phase on account of the high thermal expansion of the other high resistivity constituent phase, resulting in a PTCR effect.

Compensation of the temperature coefficient of the dielectric constant of barium strontium titanate

1995 ◽  
Vol 67 (25) ◽  
pp. 3813-3815 ◽  
Author(s):  
R. J. Cava ◽  
W. F. Peck ◽  
J. J. Krajewski ◽  
D. A. Fleming
Keyword(s):  
Dielectric Constant ◽  
Temperature Coefficient ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Barium Strontium
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