화학공학소재연구정보센터
Journal of Crystal Growth, Vol.480, 148-153, 2017
High-pressure growth and characterization of bulk MnAs single crystals
Bulk single crystals of manganese arsenide (MnAs) were grown from melt at 1 GPa and 1100 degrees C by using a cubic-anvil, high-pressure, and high-temperature technique. The as-grown black colored crystals extracted from solidified lump exhibit a plate-like morphology, with flat surfaces and maximum dimensions up to similar to 3 x 2 x 0.5 mm(3). The hexagonal crystal structure at room temperature was confirmed by Xray diffraction [B8(1), space group P6(3)/mmc, No 194, Z = 2, a = 3.7173(4) angstrom, b = 3.7173(4) angstrom, c = 5.7054(8) angstrom, and V = 68.277(16) angstrom(3)]. Temperature-dependent magnetization measurements reveal the occurrence of a first-order ferro-to paramagnetic transition at T-c = 318.5 K accompanied by a hysteresis of similar to 9 K. The successful growth of relatively large crystals reported here might be extended to various substituted analogues of MnAs, thus opening new possibilities for further exploration of this interesting system. (C) 2017 Elsevier B.V. All rights reserved.