Negative temperature coefficient (NTC) thermistors based on Ni 0.9Mn2.1-xMgxO4 (0&lex&le0.3) materials with different compositions were synthesized by a rheological phase reaction with ultrasound radiation (RPR-UR) method. It was found that the as-prepared powder crystallized well with spinel structure. It presented a microstructure of well-packed grains. The resistivity, B25/50 constant and activation energy with a wide range of values were obtained. And it can be adjusted to desired values for industrial applications by controlling the MgO content. All the results suggest that the RPR-UR method is a promising technique for the preparation of Ni0.9Mn2.1-xMg xO4 NTC ceramic materials.
Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China;Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China;Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China;Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Yao, Jincheng,Zhang, Bingyin,Wang, Junhua,et al. Preparation of Ni0.9Mn2.1-xMgxO4 (0 <= x <= 0.3) negative temperature coefficient ceramic materials by a rheological phase reaction method[J]. Materials Letters,2013,112(12):69-71.