Origin of the different color of ruby and emerald

J. M. Garcia-Lastra; M. T. Barriuso; J. A. Aramburu; M. Moreno

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Origin of the different color of ruby and emerald

机译：红宝石和祖母绿颜色不同的起源

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摘要

The different color exhibited by ruby and emerald is a fundamental but still unsolved question. According to recent EXAFS measurements, such a difference can hardly be explained on the basis of a different average distance between Cr~(3+) and the six oxygen ligands. The puzzling difference in color between the two gemstones is shown in this work to arise essentially from the distinct electrostatic potential imposed by the rest of lattice ions upon the active electrons of the CrO_6~(9-) unit. Main effects are shown to come from the electric field generated in the neighborhood of the Cr~(3+) site in ruby which is absent in the case of emerald due to symmetry.

机译：红宝石和祖母绿表现出的不同颜色是一个基本但仍未解决的问题。根据最近的EXAFS测量，很难基于Cr〜（3+）与六个氧配体之间的平均距离不同来解释这种差异。这项工作表明，两颗宝石之间颜色上令人费解的差异基本上是由其余晶格离子施加在CrO_6〜（9-）单元的活性电子上的独特静电势引起的。研究表明，主要影响来自红宝石中Cr〜（3+）部位附近产生的电场，而由于对称性，在祖母绿的情况下则没有。

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《Physical review. B, Condensed Matter And Materials Physics》 |2005年第11期|p.113104.1-113104.4|共4页
作者
J. M. Garcia-Lastra; M. T. Barriuso; J. A. Aramburu; M. Moreno;
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作者单位

Departamento de Fisica Moderna, Universidad de Cantabria, 39005 Santander, Spain;

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正文语种 eng
中图分类固体物理学;
关键词
impurity and defect levels; density functional theory, local density approximation, gradient and other corrections; point defects (vacancies, interstitials, color centers, etc.) and defect clusters; optical properties;

机译：杂质和缺陷水平;密度泛函理论;局部密度近似;梯度和其他校正;点缺陷（空位;间隙;色心等）和缺陷簇;光学性质;

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Origin of the different color of ruby and emerald

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