Affiliation of Author(s):[1]Univ Elect Sci & Technol China, Sch Elect Sci & Engn, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China;[2]Univ Elect Sci & Technol China, Yangtze Delta Region Inst Huzhou, Huzhou, Peoples R China;[3]Hainan Univ, Sch Mat Sci & Engn, Haikou, Hainan, Peoples R China
Journal:JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Key Words:conductivity; first-principles calculations; functional material; thick film resistors
Abstract:This work focuses on the evaluation of La0.5Sr0.5Co1-xZnxO3 (LSCZ, x = 0.00-0.10) ceramics as an air-fireable and economical functional material for thick film resistors. Solid-state reaction experiments and first-principles calculations were conducted to investigate the crystal structure, thermal behaviors, and electrical properties of LSCZ ceramics. The substitution of Zn2+ modified the bond properties, electron distribution, and band structure, resulting in more serious structural deformation, increasing the bond population of Co-O and weakening the charge transfer of LSCZ. Experimental results showed that the addition of Zn2+ lowered the densification temperature, activation energy, and crystallite size. As the ratio of Zn2+ increased, the conductivity and temperature coefficient of resistance showed a downward trend. Impedance variation with frequency and thermal aging tests were also performed. For the x = 0.05 specimen sintered at 1200 degrees C, values of 95.5% for relative density, 2857 S/cm for conductivity, 1267 ppm/degrees C for temperature coefficient of resistance, -0.47% for conductivity change could be achieved.
Document Type:Article
Volume:105
Issue:4
Page Number:2744-2753
ISSN No.:0002-7820
Translation or Not:no