超导CuSe2的多态选择性通过对固态转化物的动力控制
Andrew J Martinolich1, Joshua A Kurzman1, James R Neilson1
1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States.
Journal of the American Chemical Society
|March 10, 2015
概括
在固态转化反应过程中控制空气暴露,使化学家能够选择性地合成化铜化物 (CuSe2) 的马卡西特或化物多态. 这种对材料形成的动力控制为设计先进材料开辟了新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
- 固态化学 固态化学
背景情况:
- 理性材料设计是化学的一个关键目标.
- 非金反应,例如固态转化,使得在较温和的条件下能够合成新型和能量不利的材料.
- 合成途径可以影响产生的材料的结构和特性.
研究的目的:
- 研究反应条件,特别是空气暴露对CuSe2.2的多态形成的影响.
- 了解控制CuSe2.2的马卡西特和皮里特多态合成的热力学和动力学因素.
- 为了证明在固态反应中对多态选择的动力控制.
主要方法:
- CuSe2前体的固态转化反应. CuSe2前体的固态转化反应.
- 在现场同步X射线衍射和对分布函数分析以监测反应路径.
- 微分扫描热量计用于分析热性质和反应能量.
主要成果:
- 无空气反应有利于CuSe2.2的马卡西特多态体的外热形成.
- 受大气湿度影响的暴露在空气中的反应导致内热再排列,形成CuSe2.2的化物多态.
- 从CuSe2合成中解脱NaCl形成,可以对多态选择进行动力控制.
结论:
- 在固态转化过程中通过操纵空气暴露来实现对CuSe2的多态形成 (马卡西特与皮里特) 的动力控制.
- 大气中的湿度在反应途径中起着重要作用,导致化物多态化.
- 这种方法为合理设计和合成特定超导金属二基聚合物的方法提供了方法.
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