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Electrical Conductivity and Thermal Expansion of Spinels at Elevated Temperatures
Author(s) -
Petric Anthony,
Ling Hang
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01522.x
Subject(s) - thermal expansion , electrical resistivity and conductivity , materials science , thermal conductivity , analytical chemistry (journal) , metal , oxide , ferrite (magnet) , manganese , transition metal , copper , conductivity , metallurgy , mineralogy , chemistry , composite material , biochemistry , chromatography , electrical engineering , engineering , catalysis
Binary oxide spinels composed of Mg, Al, Cr, Mn, Fe, Co, Ni, Cu, and Zn were synthesized. Electrical conductivity was measured in air at 500°–800°C. Thermal expansion was measured from room temperature to 1000°C. Ferrite spinels have thermal expansion coefficients of 11–12 ppm/K, compared with 7–9 ppm/K for other spinels except Cu–Mn and Co–Mn which show anomalous behavior. The highest electrical conductivity among transition metal spinels was found for MnCo 2 O 4 (60 S/cm at 800°C) and Cu 1.3 Mn 1.7 O 4 (225 S/cm at 750°C).