科研之友
微信
新浪微博
Facebook
分享链接
摘要
Ba6-xSrxNb10O30 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 2-400K 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 approximate to 10-30K) "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.
- 出版日期2014-3-17
