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Tunable Linear Thermal Expansion Coefficient of Amorphous Zirconium Tungstate
Author(s) -
Catafesta Jadna,
Zorzi Janete E.,
Perottoni Cláudio A.,
Gallas Márcia R.,
Da Jornada João Alziro H.
Publication year - 2006
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.1551-2916.2006.01019.x
Subject(s) - thermal expansion , amorphous solid , materials science , annealing (glass) , negative thermal expansion , tungstate , zirconium , metastability , temperature coefficient , recrystallization (geology) , thermodynamics , atmospheric temperature range , isotropy , composite material , crystallography , chemistry , metallurgy , optics , paleontology , physics , organic chemistry , biology
Zirconium tungstate (α‐ZrW 2 O 8 ) exhibits isotropic negative thermal expansion over a wide range of temperatures. Under high pressure it transforms to a metastable amorphous phase with positive thermal expansion coefficient. α‐ZrW 2 O 8 can be fully recovered by annealing the amorphous phase at temperatures slightly above 600°C, at room pressure. In this work, we describe the dependency of the linear thermal expansion coefficient of amorphous ZrW 2 O 8 with the annealing temperature, showing that it can be continuously tuned, in two stages, from about 7.5° to −9°C −1 . These two stages are related to the relaxation of the amorphous phase and the onset of recrystallization, respectively.