Single crystal growth in series of layered oxyselenide Sr2MCu2Se2O2 (M = Co, Ni) by melt-solidification method

Kato, Takahiro; Iwasa, Yuki; Yokota, Yuui; Ishida, Shigeyuki; Kato, Junichiro; Mino, Yutaro; Naik, S. Pavan Kumar; Horiai, Takahiko; Yoshikawa, Akira; Nishio, Taichiro; Eisaki, Hiroshi; Ogino, Hiraku; Kato, Takahiro; Iwasa, Yuki; Yokota, Yuui; Ishida, Shigeyuki; Kato, Junichiro; Mino, Yutaro; Naik, S. Pavan Kumar; Horiai, Takahiko; Yoshikawa, Akira; Nishio, Taichiro; Eisaki, Hiroshi; Ogino, Hiraku

doi:2025.62.3.498

J. Korean Ceram. Soc. > Volume 62(3); 2025 > Article

Original Article

Journal of the Korean Ceramic Society 2025;62(3): 498-503.
doi: https://doi.org/10.1007/s43207-024-00473-y

Single crystal growth in series of layered oxyselenide Sr₂MCu₂Se₂O₂ (M = Co, Ni) by melt-solidification method

Takahiro Kato^1,2, Yuki Iwasa³, Yuui Yokota⁴, Shigeyuki Ishida¹, Junichiro Kato^1,2, Yutaro Mino^1,2, S. Pavan Kumar Naik², Takahiko Horiai⁴, Akira Yoshikawa⁴, Taichiro Nishio², Hiroshi Eisaki¹, Hiraku Ogino¹

¹Research Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
²Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-Ku, Tokyo, 162-8601, Japan
³National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Central 3, Umezono, Tsukuba, Ibaraki, 305-8563, Japan
⁴Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, Miyagi, 980-8577, Japan

Correspondence

Takahiro Kato ,Email: katou.takahiro@aist.go.jp
Hiraku Ogino ,Email: h-ogino@aist.go.jp

Received: September 26, 2024; Revised: December 12, 2024 Accepted: December 29, 2024. Published online: February 10, 2025.

ABSTRACT

Single crystals of layered oxychalcogenide Sr₂MCu₂Se₂O₂ (M = Co, Ni) have been successfully grown by the melt-solidification method. Thermal analysis and X-ray diffraction measurement results revealed that these compounds are congruent melting under a sealed environment similar to Sr₂ZnCu₂Se₂O₂, while melting points are slightly different. The plate-like single crystals on the order of mm² were obtained by melt solidification. The anisotropy of resistivity in Sr₂CoCu₂Se₂O₂ showed that the resistivity in the c-axis direction was about 200 times higher than in the a(b)-axis direction, reflecting the two-dimensional crystal structure. These results indicate that there are several congruent melting layered mixed-anion compounds, even though they have complex crystal structures with multiple components. Thus, the single crystal growth method by melt-solidification under a sealed environment has the potential to be applied to other relative compounds.

Key words: Single crystal · Melt growth · Mixed-anion compound · Layered material