正交晶系
材料科学
四方晶系
电阻率和电导率
微晶
微波食品加热
钨
晶体结构
可变距离跳频
大气温度范围
分析化学(期刊)
Crystal(编程语言)
矿物学
热传导
结晶学
化学
冶金
复合材料
热力学
电气工程
物理
工程类
量子力学
色谱法
程序设计语言
计算机科学
作者
Jin Guo,C. Dong,Lihong Yang,Guangcai Fu,Hong Chen
标识
DOI:10.1016/j.materresbull.2005.08.032
摘要
Calcium tungsten bronzes CaxWO3 (0.01 ≤ x ≤ 0.15) were synthesized by hybrid microwave method from mixtures of CaO, WO3 and tungsten powder. Single-phased samples can be obtained by microwave heating within 40 min. With the increase of calcium content, the crystal structure of CaxWO3 transforms from orthorhombic (0.01 ≤ x ≤ 0.02) to tetragonal (0.03 ≤ x ≤ 0.11) and then to cubic (0.12 ≤ x ≤ 0.15). The average size of crystallites is in the range 1–5 μm. All samples show semiconductor behaviour in their temperature dependence of resistivity. The electrical conduction mechanism changes from variable-range hopping to the thermally activated mechanism when x > 0.12.
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