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克拉特酸盐Ba8Au16P30:用于格子导热性的"黄金标准"
James Fulmer1, Oleg I Lebedev, Vladimir V Roddatis
1Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, USA.
Journal of the American Chemical Society
|July 19, 2013
概括
一种新的黄金酸盐,Ba8Au16P30,被合成和特征. 由于其独特的结构和缺陷,这种材料表现出对磁性金属性质和异常低的晶格导热率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 克拉酸化合物以其独特的结构和潜在的应用而闻名.
- 了解新型酸盐相中的结构性质关系对于材料发现至关重要.
研究的目的:
- 为了合成和描述一种新型的酸盐相,Ba8Au16P30.
- 阐明Ba8Au16P30的晶体结构,局部结合和物理性质.
- 调查热传输特性并确定导致低导热率的因素.
主要方法:
- 从元素中进行合成.
- 高分辨率粉末X射线衍射 (XRD) 用于结晶结构的确定.
- 传输电子显微镜 (TEM) 用于原子尺度成像.
- (31) P 固态核磁共振 (NMR) 光谱用于局部结构和结合.
- 对电特性进行电阻测量.
- 测量热导电能力. 测量热导电能力.
主要成果:
- Ba8Au16P30结晶成一个有着明显的黄金和位的酸盐-I的合结构.
- 通过 (31) P NMR. 一个原子被证实是三坐标的.
- 这种材料表现出一定的磁性金属行为,室温电阻率为1.7mΩcm.
- 在室温下观察到异常低的晶格导热率 (0.18 W m(-1) K(-1)) .
- 在原子尺度上检测到许多缺陷,包括双胞胎和反相边界.
结论:
- Ba8Au16P30是一种新型的酸盐,具有明确的晶体结构,含有独特的协调.
- 该材料由于其显著低的晶格导热率,具有有前途的热电特性.
- 框架中的缺陷和重原子的存在是导致声子散射和热导率降低的关键因素.
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