Identifying characteristics of charge transfer transitions in minerals
Identifying characteristics of charge transfer transitions in minerals
复制标题
识别矿物中电荷转移转变的特征
DOI：
10.1007/bf00311152
复制
发表时间：
1987
影响因子：
1.4
通讯作者：
G. Rossman
中科院分区：
文献类型：
--
作者：
S. M. Mattson;G. Rossman
本文综述了电子光谱中Fe ~（2+）-Fe ~（3+）和Fe ~（2+）-Ti ~（4+）价间电荷转移吸收带的鉴别标准，并与未扰动的Fe ~（2+）晶场带和与Fe ~（3+）相互作用增强的晶场带的特征进行了比较。能带能量是最不确定的诊断标准。谱带强度随温度的变化也是有限的。大宽度是电荷转移带最可靠的特征。提出了钙钛矿的新的光学吸收光谱，以及岩桥石、巴丙顿石和天青石的80 K光谱。比较的光学光谱的磁化率测量的岩桥石和巴丙顿石提供了支持最近的理论，磁耦合效应的电荷转移强度随温度的变化。
Criteria used to identify Fe2+-Fe3+ and Fe2+-Ti4+ intervalence charge transfer absorption bands in electronic spectra are reviewed and compared to the characteristics of unperturbed Fe2+ crystal field bands and those that are intensified by interaction with Fe3+. Band energy is the least definitive diagnostic criterion. Changes in band intensity with temperature are also of limited value. Large widths are the most reliable characteristic of charge transfer bands. New optical absorption spectra are presented for euclase, as well as 80 K spectra of rockbridgeite, babingtonite and lazulite. Comparison of optical spectra to magnetic susceptibility measurements for rockbridgeite and babingtonite provides support for recent theories regarding the effect of magnetic coupling on the variation of charge transfer intensity with temperature.