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Electrical Properties and Defect Structure of Zirconia: II, Tetragonal Phase and Inversion
Author(s) -
VEST R. W.,
TALLAN N. M.
Publication year - 1965
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.1151-2916.1965.tb14802.x
Subject(s) - tetragonal crystal system , monoclinic crystal system , electrical resistivity and conductivity , cubic zirconia , materials science , partial pressure , isothermal process , ionic conductivity , ionic bonding , phase (matter) , oxygen , mineralogy , chemistry , thermodynamics , crystal structure , crystallography , ion , composite material , electrode , ceramic , physics , organic chemistry , engineering , electrical engineering , electrolyte
The defect structure of tetragonal zirconia was investigated by measuring the temperature and oxygen partial pressure dependence of the electrical conductivity and the electronic transference number. Tetragonal zirconia was a mixed electronic and ionic conductor under all conditions studied. The n ‐type electronic conductivity observed at high temperatures and low oxygen partial pressures was interpreted on the basis of a defect model involving fully ionized oxygen vacancies. The conductivity change associated with the monoclinic ⇒ tetragonal phase transformation was isothermal, but the rate of change was a function of the thermal history and the method of preparation of the sample.