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Study of Phase Decomposition in ZrW 2 O 8
Author(s) -
Fedorova Anna,
Kämpf Timo,
Scheffler Michael
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600035
Subject(s) - materials science , decomposition , thermal decomposition , phase (matter) , tungstate , phase transition , composite number , zirconium , negative thermal expansion , composite material , analytical chemistry (journal) , thermodynamics , thermal expansion , metallurgy , chemistry , chromatography , physics , organic chemistry
This paper describes the decomposition behavior of zirconium tungstate (ZrW 2 O 8 ) materials above 1 050 K. The materials are synthesized according to a sol–gel‐route and a solid‐state route, and have been characterized with respect to their crystallographic properties. Apart from the initial phase and decomposition products ZrO 2 and WO 3 , the additional phase γ‐ZrW 2 O 8 is found, which results from a phase transition initiated by local pressures higher than 200 MPa. Residual stresses induced by the thermal mismatch between different phases within the composite material are found to be 1.15 GPa(ZrO 2 /ZrW 2 O 8 ) and 1.26 GPa (WO 3 /ZrW 2 O 8 ). Obtained stress values are high enough to induce this transition.