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NiI2 single-crystal growth

FG Frank Y. Gao
XP Xinyue Peng
XC Xinle Cheng
EB Emil Viñas Boström
DK Dong Seob Kim
RJ Ravish K. Jain
DV Deepak Vishnu
KR Kalaivanan Raju
RS Raman Sankar
SL Shang-Fan Lee
MS Michael A. Sentef
TK Takashi Kurumaji
XL Xiaoqin Li
PT Peizhe Tang
AR Angel Rubio
EB Edoardo Baldini
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NiI2 single crystals were grown in a similar method as previously reported16. Pure nickel (99.99%) (Ni) and iodine (I2) reagents were purchased from Sigma Aldrich. The growth of NiI2 single crystals was performed in quartz ampoules by mixing Ni and I2 powders under a vacuum of 10−3 Pa. The ampoules were placed in a horizontal furnace at 650 °C for 2 days to obtain partially mixed crystals. Afterwards, the mixed crystals were used to grow the pure NiI2 single crystals with the help of a chemical vapour transport method setup. For the growth of NiI2 single crystals, the end of the ampoule containing the preheated material was held at 750 °C, and the growth end was maintained at a temperature near 650 °C with a temperature gradient near 2.5 °C cm−1 for 2 weeks. Shiny NiI2 single crystals of sizes up to 6 × 4 × 1.5 mm3 were obtained.

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