Details

Autor(en) / Beteiligte

• Zhang, Dong-Yan
• Zhang, Hui-Min
• Jin, Xian-Jing
• Chang, Ai-Min

Titel

Preparation and Thermal Sensitive Characteristics of the Co(0.8)Mn(0.8)Ni(0.9)Fe(0.5)O(4) Nanometer Powders

Ist Teil von

• Wu ji cai liao xue bao, 2009-09, Vol.24 (5), p.1008-1012

Erscheinungsjahr

2009

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Nano-powders of Co(0.8)Mn(0.8)Ni(0.9)Fe(0.5)O(4) NTC (Negative Temperature Coefficient) thermistor materials were prepared by co-precipitation method with NH(4)HCO(3) as precipitator. The effects of calcination temperature on the material phase were studied. The influences of different sintering processes on the micro-structure and thermal sensitive characteristics of NTC thermistor materials were investigated. The samples were characterized by XRD, TG/DTA, FT-IR, SEM, and Laser Particle Size Analyzer. The results show that the powders calcined at 750 deg C are single spinel, the grain size of the powders is about 32. lnm, and the particle size is about 50-100nm. The samples possess better electrical properties: p25 deg C =1183Omega * cm, B(25/50) = 3034K under the process conditions of constant temperature 840t and 1200T! for 2h respectively, the heating and cooling rate of l deg C/min. It is found that proper sintering process can effectively improve the mi-crostracture and thermal sensitive properties of t