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前言非等轴晶系的晶体具有光学异向性,这是人所共知的,但是真正研究晶体的光学异向性和晶体内部结构的关系还是本世纪二十年代才开始的事情。后来英国晶体物理学家伍斯特,总结出晶体的重折射率和晶体结构关系的几条规律,这些规律一直为晶体物理和矿物学教程所引用。对透明矿物而言,重折射、多色性和吸收性等等是光学异向性的反映。作者引入了一个新的概念—光性异向指数(Optical anisotropy index,简称OAI值),并用以讨论碳酸盐的光学异向性与晶体结构之间的关系。不久前,作者又再论述碳酸盐的光学异向性与CO_3定向的关系,并引入折射度指示体(Refractivity indicatrix,简称RI)的概念。把光性异向指数的概念更加明确,将它和折射度指示体联系起来。为了本文的系统性和连贯性,这里把这两个概念再简单交待一下,下面将着重介绍光性异向指数和晶体结构之间的关系。
It is well known that non-equiaxed crystals have optical anisotropy, but the true study of the relationship between the crystal’s optical anisotropy and the internal structure of the crystal is still something that began in the 1920s. Later, the British crystal physicist Wooster, summed up the law of the refractive index of the crystal and the crystal structure of several laws, these laws have been quoted for the crystal physics and mineralogy tutorial. For transparent minerals, refraction, polychromaticity and absorptivity are the reflection of optical anisotropy. The authors introduced a new concept, the Optical Anisotropy Index (OAI), and discussed the relationship between the optical anisotropy of carbonate and the crystal structure. Not long ago, the author again discussed the relationship between the optical anisotropy of carbonates and the CO 3 orientation and introduced the concept of Refractivity indicatrix (RI). The concept of the index of anisotropy of light is made more explicit by linking it to the index of refraction. For the sake of the systematicness and coherence of this article, let’s explain these two concepts briefly. The following will focus on the relationship between the index of anisotropy of light and the crystal structure.