A novel method to regulate the density of BaTiO3 ceramics for positive temperature coefficient resistance via tape casting

2012 ◽  
Vol 24 (3) ◽  
pp. 987-992 ◽  
Author(s):  
Qiu-yun Fu ◽  
Yu-xiang Qin ◽  
Dong-xiang Zhou ◽  
Yun-xiang Hu ◽  
Zhen-zhen Xie
Keyword(s):  
Temperature Coefficient ◽  
Tape Casting ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Novel Method

Effects of BN Dopant on Electrical Characteristics of Barium-Excessive BaTiO3 Ceramics for Laminated Positive Temperature Coefficient Thermistors Fabricated by Tape Casting Technique

2011 ◽  
Vol 415-417 ◽  
pp. 994-999
Author(s):  
Bin Bin Chen ◽  
Shu Ping Gong ◽  
Jian Qiao Liu ◽  
Lian Hua Li ◽  
Dong Xiang Zhou
Keyword(s):  
Charge Carrier ◽  
Temperature Coefficient ◽  
Tape Casting ◽  
Positive Temperature Coefficient ◽  
State Density ◽  
Room Temperature Resistivity ◽  
Positive Temperature ◽  
Charge Carrier Density ◽  
Acceptor State ◽  
Casting Technique

The barium-excessive BaTiO3 ceramics with BN addition for laminated positive temperature coefficient (PTC)thermistors are fabricated. The tape casting technique and reduction/reoxidation process are employed into the fabricating procedure. The influences of BN additive on ceramic characteristics are discussed. The addition over 5% leads to rectangular and abnormal large grains. The 5% BN-doped ceramics shows a resistivity of 233 Ω•cm and PTC jump of 3.4 orders of magnitude. The charge carrier density in grain bulk and acceptor state density at grain boundaries are evaluated. The correlation of BN doping amount with room temperature resistivity, PTC jump, reoxidation effect as well as charge carrier and acceptor state density are investigated.

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