Asano Shuto, Niwa Ken, Lawler Keith V, Kawaguchi-Imada Saori, Sasaki Takuya, Hasegawa Masashi
Department of Materials Physics, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan.
Research Center for Crystalline Materials Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.
Inorg Chem. 2023 Dec 11;62(49):20271-20278. doi: 10.1021/acs.inorgchem.3c03241. Epub 2023 Nov 22.
A novel high-pressure phase of manganese mononitride, NiAs-type MnN, was successfully synthesized through a pressure-induced phase transition from a tetragonal distorted NaCl-type MnN at pressures above approximately 55 GPa. High-pressure experiments, including starting material preparation, were conducted using a laser-heated diamond anvil cell. This result is the first example of a nitride with a structural phase transition from the distorted NaCl-type to the NiAs-type structure. Upon decompression after the phase transition to NiAs-type structure, the NiAs-type MnN underwent a structural change to the distorted NaCl-type phase, indicating the phase transition was reversible. NiAs-type MnN has a higher density and bulk modulus in comparison to the distorted NaCl-type one. The phase transition pressure of MnN is lower than that of oxides, such as FeO and MnO, which show a structural phase transition from a NaCl-type to a NiAs-type structure. It is suggested that this is due to the lattice distortion caused by antiferromagnetic ordering.
通过在高于约55 GPa的压力下由四方畸变的NaCl型MnN发生压力诱导相变，成功合成了一种新型的单氮化锰高压相——NiAs型MnN。使用激光加热金刚石对顶砧室进行了包括起始材料制备在内的高压实验。这一结果是具有从畸变的NaCl型到NiAs型结构的结构相变的氮化物的首个实例。在相变为NiAs型结构后减压时，NiAs型MnN发生结构变化转变为畸变的NaCl型相，表明该相变是可逆的。与畸变的NaCl型MnN相比，NiAs型MnN具有更高的密度和体模量。MnN的相变压力低于诸如FeO和MnO等氧化物的相变压力，这些氧化物显示出从NaCl型到NiAs型结构的结构相变。据推测，这是由于反铁磁有序引起的晶格畸变所致。
