Synthesis, Structure and Properties of InSeI Single Crystals

Abstract

Abstract: InSeI single crystals were synthesized by the chemical vapor transport (CVT) method. The crystal is yellow needle-shaped and brittle. X-ray diffraction results at room temperature show the tetragonal system of InSeI, with lattice parameters of a=b=1.864 3(5) nm, c=1.012 0(3) nm, V=3.517 2 nm³, and space group is I4₁/a. The ultraviolet-visible absorption spectrum, photoluminescence spectrum results show that InSeI has a 2.48 eV band gap, under the excitation of a certain band of light, InSeI single crystal has a wide emission peak at about 600 nm, which indicates that the luminescence mode of the crystal is defect state luminescence. The dielectric temperature spectrum indicates that a phase transition happened in the tetragonal structure of InSeI crystals at 440 K.

Key words: InSeI, metal based thiohalide, chemical vapor transport method, photoluminescence, band gap, dielectric property

CLC Number:

ZHOU Xuan, CHENG Guofeng, HE Daihua. Synthesis, Structure and Properties of InSeI Single Crystals[J]. Journal of Synthetic Crystals, 2020, 49(12): 2252-2255.

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