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Heat Capacity of Monoclinic Zirconia between 2.75 and 350 K
Author(s) -
Nevitt Michael V.,
Fang Yué,
Chan SaiKit
Publication year - 1990
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.1151-2916.1990.tb07619.x
Subject(s) - monoclinic crystal system , tetragonal crystal system , heat capacity , phonon , materials science , phase (matter) , volume (thermodynamics) , cubic zirconia , thermodynamics , condensed matter physics , mineralogy , chemistry , crystallography , physics , crystal structure , composite material , organic chemistry , ceramic
We have measured the constant‐pressure heat capacity C p of pure monoclinic ZrO 2 between 2.75 and 350 K. At low temperatures we find heat capacity in excess of the thermal acoustic phonon contribution, which we attribute to the ingress of low‐lying optic mode vibrations. We have calculated the heat capacity at constant volume C v at the high‐temperature end of our measurement range and used these values with the harmonic model to derive the moments of the phonon spectrum. Comparing the moments of the monoclinic phase with theoretically derived corresponding moments for the tetragonal phase, we find that a downward shift of optic mode frequencies accompanies the tetragonal‐to‐monoclinic transformation.