Hitachi Chemical Company, Ltd.

Mitsushi Kamada

Hiroyuki Ishibashi

Kazuhisa Kurashige

Naoaki Shimura

Akihiro Gunji

When produced as a single crystal ingot, a rare earth silicate single crystalcan be formed by cutting out from the single crystal ingot. The single crystalhas a crystal face Fwhose Miller indices can be determined by X-ray diffraction. The crystal face Fis composed of a plurality of smooth partial region surfaces (for example, the partial region surface fA and partial region surface fB), the plurality of partial region surfaces each have an area detectable by X-ray diffraction, and the angles &#x3b8; formed between the normal vectors of the plurality of partial region surfaces satisfy the following inequality:0.1&#xb0;&#x2266;&#x3b8;&#x2266;2.0&#xb0;.&#x2003;&#x2003;(1)

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Hitachinaka, Japan

Mitsushi Kamada