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A new identification of the conducting phase in tungsten‐titanium‐phosphate glass‐ceramics
Author(s) -
Moore Lisa,
Dutta Indrajit,
Wheaton Bryan,
Stapleton Erika,
Parysek Ronald,
Aitken Bruce
Publication year - 2020
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.17023
Subject(s) - tungsten , materials science , titanium , suboxide , phosphate glass , ceramic , electrical resistivity and conductivity , phase (matter) , phosphate , titanium oxide , scheelite , metallurgy , mineralogy , oxide , chemical engineering , chemistry , doping , optoelectronics , organic chemistry , electrical engineering , engineering
Glass‐ceramics in the tungsten‐titanium‐phosphate system were first reported in 1992. The glass‐ceramics exhibited electrical resistivity as low as log( ρ ) = −1.8 Ω·cm, which was attributed to an interconnecting network of tungsten suboxide crystals, WO 3− x . A new identification of the conducting phase as a phosphate tungsten bronze, (PO 4 ) 2 (WO 3 ) 2m , is reported. High‐temperature x‐ray diffraction and electron microscopy have been used to provide a detailed description of the crystalline phases and their development. As the ceramming temperature was raised, the phase assemblage progressed from cubic tungsten oxide and titanium pyrophosphate to phosphate tungsten bronzes. The m‐values of the bronzes ranged from 2 to 7 depending on composition.