Investigations on synthesis, growth, electrical and defect studies of lithium selenoindate single crystals

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• 作者：P. Vijayakumar ; M. Magesh ; A. Arunkumar ; G. An ; ha Babu ; P. Ramasamy ; S. Abhaya
• 关键词：A1. Characterization ; A1. Defects ; A1. Solidification ; A2. Bridgman technique ; B1. Lithium compounds ; B2. Semiconducting ternary compounds
• 刊名：Journal of Crystal Growth
• 出版年：15 February, 2014
• 年：2014
• 卷：388
• 期：Complete
• 页码：17-21
• 全文大小：542 K

文摘

LiInSe₂ polycrystalline material was successfully synthesized from melt and temperature oscillation method (MTOM). The crystalline phase was con铿乺med by powder X-ray diffraction pattern. Crack free LiInSe₂ single crystal of size 12 mm diameter and 32 mm length was grown using two zone tubular resistive heated furnace by modified vertical Bridgman-Stockbarger method with steady ampoule rotation. The grown LiInSe₂ crystal was subjected to single crystal XRD, inductively coupled plasma-optical emission spectroscopy (ICP-OES), positron annihilation spectroscopy (PAS), Hall effect and dielectric measurements. Single crystal XRD measurement confirms the orthorhombic crystal system. ICP-OES analysis gives the crystal composition as Li_0.81In_1.01Se_2.18. The average lifetime 278.03 ps in PAS measurements corresponds to vacancy clusters present in LiInSe₂ crystal. Hall effect measurement confirms the n-type semiconductor nature. The dielectric permittivity and dielectric loss were obtained to be 9.8 and 0.108 respectively by capacitance measurements at room temperature for the frequency of 2 MHz.