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Anisotropic Thermal Diffusivity and Conductivity of La‐Doped Strontium Niobate Sr 2 Nb 2 O 7
Author(s) -
Sparks Taylor D.,
Fuierer Paul A.,
Clarke David R.
Publication year - 2010
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.1551-2916.2009.03533.x
Subject(s) - thermal diffusivity , anisotropy , thermal conductivity , materials science , perovskite (structure) , mineralogy , doping , analytical chemistry (journal) , ferroelectricity , condensed matter physics , phase (matter) , strontium , conductivity , electrical resistivity and conductivity , chemistry , crystallography , thermodynamics , dielectric , optics , composite material , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics
The thermal diffusivity of the La‐doped layered perovskite Sr 2 Nb 2 O 7 parallel and perpendicular to the perovskite layers is reported from room temperature up to 1000°C. The anisotropy persists through an incommensurate‐normal ferroelectric phase transformation at 215°C and up to 1000°C, the maximum temperature of our measurements. The thermal conductivity perpendicular to the perovskite layers, derived from the diffusivity in the same direction, calculated using the density and measured heat capacity, has a constant value of 1.05±0.05 W/mK up to 1000°C. Possible explanations for the low thermal conductivity and anisotropy are described.