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Negative Thermal Expansion in (HfMg)(WO 4 ) 3
Author(s) -
Suzuki Tomoko,
Omote Atsushi
Publication year - 2004
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.1151-2916.2004.tb07737.x
Subject(s) - tungstate , thermal expansion , orthorhombic crystal system , calcination , negative thermal expansion , materials science , thermal , phase (matter) , analytical chemistry (journal) , mineralogy , crystallography , chemistry , crystal structure , composite material , metallurgy , thermodynamics , catalysis , biochemistry , physics , organic chemistry , chromatography
A single‐phase material (HfMg)(WO 4 ) 3 with an orthorhombic structure, A 2 (WO 4 ) 3 ‐type tungstate, has been successfully prepared for the first time by the calcination of HfO 2 , MgO, and WO 3 , substituting Hf 4+ and Mg 2+ for A 3+ cations in A 2 (WO 4 ) 3 . The new material shows a negative thermal expansion coefficient of approximately −2 ppm/°C from room temperature to 800°C. The mechanism of negative thermal expansion is assumed to be the same as that of Sc 2 (WO 4 ) 3 .