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Direct‐Current Conductivity of Y 2 O 3 as a Function of Water Vapor Pressure
Author(s) -
NORBY TRULS,
KOFSTAD PER
Publication year - 1986
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.1151-2916.1986.tb07359.x
Subject(s) - conductivity , vapor pressure , impurity , analytical chemistry (journal) , water vapor , electrical resistivity and conductivity , enthalpy , vapour pressure of water , chemistry , partial pressure , metal , yttria stabilized zirconia , activation energy , materials science , thermodynamics , cubic zirconia , oxygen , ceramic , chromatography , electrical engineering , engineering , physics , organic chemistry
The dc conductivity of a sintered sample of Y 2 O 3 containing an excess of lower‐valent metal (Ml) impurities has been measured at 600° to 1100°C in air as a function of the water vapor pressure (0.4 to 3000 Pa). The logarithm of the p ‐type conductivity vs log P H2o has a slope of – 1/2 in certain regions of F H2o and temperature. This reflects a defect situation where interstitial protons from water vapor balance the excess of lower‐valent cation impurities: [H ˙ ] = [M1 ′ ]. The activation energy for the p ‐type conductivity under these conditions is evaluated and interpreted in terms of the enthalpy needed to dissolve interstitial protons in yttria.