Horizontal Zone Refining of Indium Iodide (InI) Polycrystal

doi:10.15541/jim20150121

Abstract

Abstract:

The indium iodide (InI) polycrystal which was synthesized by two-zone vapor transporting method was purified by using horizontal zone refining method. Preparation process on high quality and single phase InI polycrystal was successfully fixed. The lattice structure, morphology, component and impuritily concentration of InI crystal were investigated by X-Ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS) and Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The results indicate that the InI polycrystal after refinement has better lattice structure and higher quality than before. The lattice constants of a, b and c are 0.476 nm, 1.278 nm and 0.491 nm, respectively, which are very close to the theoretical values. The stoichiometric ratio of In to I is effectively modified and close to the theoretical stoichiometric ratio 1:1. The intermediate products and impurities concentrations decrease significantly. An InI single crystal with high resistivity (about 10¹⁰ Ω·cm) is grown by Czochralski (CZ) method with the purified InI polycrystal obtained in this work.

Key words: indium iodide, polycrystalline synthesis, vapor transporting, zone refining, purification

CLC Number:

XU Zhao-Peng, ZHANG Lei, WANG Qian, JI Liang-Liang, LI Ya-Ke. Horizontal Zone Refining of Indium Iodide (InI) Polycrystal[J]. Journal of Inorganic Materials, 2015, 30(10): 1063-1068.

Figures/Tables 12

Fig. 1 Schematic diagram of synthesis furnace and temperature curve for InI polycrystal

Fig. 2 Indium-Iodine compound phase diagram[4]

Fig. 3 Temperature curve for InI polycrystal

Fig. 4 Synthesized InI polycrystal

Table 1 Segregation coefficient of elements in iodine and indium

Element	Mg	Ni	Ca	Cr	Fe
K₀	0.013	0.163	0.071	0.018	0.028

Fig. 5 Schematic diagram of zone refining process (a) and zone refining furnace (b)

Fig. 6 XRD patterns of InI polycrystalline sample before (a) and after (b) refinement

Fig. 7 SEM images of InI polycrystal before (a) and after (b) refinement

Table 2 EDS analysis results of InI polycrystalline samples before and after refinement

Sample	In/at%	I/at%	Total/at%
Before refinement	47.13	52.87	100
After refinement	50.69	49.31	100

Table 3 Concentrations of elements in InI polycrystalline before and after refinement

Elements	In/at%	I/at%	Li/ (μg·mL^-1)	Cr/ (μg·mL^-1)	Cu/ (μg·mL^-1)	Mg/ (μg·mL^-1)	Al/ (μg·mL^-1)	Zn/ (μg·mL^-1)	Fe/ (μg·mL^-1)	Ni/ (μg·mL^-1)
Before refinement	47.58	52.41	0.0504	0.0469	0.0790	0.1287	0.1256	0.2885	0.6436	0.8187
After refinement	50.74	49.25	--	--	0.0093	0.0107	0.0311	0.0291	0.0565	0.0740

Fig. 8 InI crystal grown by CZ method

Fig. 9 Current-voltage curve of InI crystal

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