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Thermoelectric properties of tungsten‐titanium‐phosphate glass‐ceramics
Author(s) -
Moore Lisa,
Aitken Bruce,
Work Kim,
Stapleton Erika,
Davis Ronald
Publication year - 2021
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.17796
Subject(s) - materials science , seebeck coefficient , tungsten , thermoelectric effect , electrical resistivity and conductivity , titanium , ceramic , thermoelectric materials , thermal conductivity , composite material , oxide , crystallite , atmospheric temperature range , mineralogy , analytical chemistry (journal) , metallurgy , thermodynamics , chemistry , physics , chromatography , electrical engineering , engineering
The thermoelectric properties of tungsten‐titanium phosphate glass‐ceramics, which were described in previous articles, were measured as a function of composition, ceram temperature, and measurement temperature. The glass‐ceramics comprise tungsten monophosphate crystals, (PO 2 ) 4 (WO 3 ) 2 m , in a matrix of TiP 2 O 7 . The glass‐ceramics behave as n‐type semiconductors with nearly metallic behavior. Conduction occurs along percolating networks of primarily m6 and m7 crystals. The highest electrical conductivities and (absolute) Seebeck coefficients were measured on a glass‐ceramic containing large, interconnecting, prismatic, m7 crystals. At 777°C, the electrical conductivity reached nearly 5500 S/m and the Seebeck coefficient was −60 µV/K. Thermal conductivity was in the 2.5‐3 W/m.K range, and the maximum ZT obtained was 0.007. This ZT is two orders of magnitude lower than those of the best bulk, polycrystalline, n‐type, oxide thermoelectric materials. The exceptional property of the tungsten‐titanium phosphate glass‐ceramics is their high electrical conductivity when compared with oxide glasses.