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In Situ Thermometry Measuring Temperature Flashes Exceeding 1,700°C in 8 mol% Y 2 O 3 ‐Stablized Zirconia Under Constant‐Voltage Heating
Author(s) -
Park Jungdeok,
Chen IWei
Publication year - 2013
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/jace.12176
Subject(s) - analytical chemistry (journal) , materials science , ceramic , sintering , electrical impedance , in situ , yttria stabilized zirconia , mineralogy , chemistry , composite material , electrical engineering , cubic zirconia , chromatography , engineering , organic chemistry
Using AC impedance spectroscopy as a means of in situ thermometry, temperature runaway over 1,500°C within a few seconds was observed for the first time in dense 92 mol% ZrO 2 –8 mol% Y 2 O 3 (8 YSZ ) ceramics heated under a constant voltage. Such runaway is especially pronounced when starting from a low background temperature in samples of a small surface‐to‐volume ratio, and is expected to be commonplace during flash sintering of porous ceramic cubes or cylinders. The method of AC impedance‐based thermometry is applicable to other ceramics with a well‐defined conduction mechanism at high temperature.