Abnormal thermal conductivity in tetragonal tungsten bronze Ba{sub 6−x}Sr{sub x}Nb{sub 10}O{sub 30}

Journal Article · Mon Mar 17 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4868876· OSTI ID:22257729

Sakurai, H.; Vasylkiv, O.; Borodianska, H. ^[1]; Mozharivskyj, Y. ^[2]

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1. National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan)
2. Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S4M1 (Canada)

Ba{sub 6−x}Sr{sub x}Nb{sub 10}O{sub 30} solid solution with 0 ≤ x ≤ 6 crystallizes in centrosymmetric tetragonal “tungsten bronze” structure (space group P4/mbm). We report on the x dependence of thermal conductivity of polycrystalline samples measured in the 2–400 K temperature interval. Substitution of Sr for Ba brings about a significant decrease in thermal conductivity at x ≥ 3 accompanied by development of a low-temperature (T ≈ 10–30 K) “plateau” region reminiscent of a glass-like compounds. We explain this behaviour based on a size-driven site occupancy and atomic displacement parameters associated with an alkaline earth atomic positions in the title compounds.

• OSTI ID: 22257729
• Journal Information: Applied Physics Letters, Vol. 104, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC DISPLACEMENTS
POLYCRYSTALS
SOLID SOLUTIONS
TETRAGONAL LATTICES
THERMAL CONDUCTIVITY
TUNGSTEN BRONZE