High-pressure behavior of tetragonal barium carbodiimide, BaNCN

High-pressure behavior of tetragonal barium carbodiimide, BaNCN
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四方碳二亚胺钡BaNCN的高压行为

DOI:
10.1016/j.jallcom.2022.165632
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发表时间:
2022
影响因子:
6.2
通讯作者:
Maezono Ryo
Maezono Ryo
中科院分区:
材料科学2区
文献类型:
--
作者:
Masubuchi Yuji;Miyazaki Suzuka;Song Peng;Yamamoto Takafumi;Nakano Kosuke;Hongo Kenta;Maezono Ryo

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采用原位高压X射线衍射测量和第一性原理理论计算研究了碳化二亚胺钡(BaNCN)的高压行为。在压缩到6.0 GPa和随后减压到环境压力的过程中,没有观察到相变或分解。从晶胞体积相对于施加的压力估计的体积模量为69(2)GPa,这与通过第一原理计算估计的体积模量相当。理论计算表明,Ba-N键长的收缩对响应于压力的体积变化具有至关重要的影响,而NCN 2-阴离子中的C-N键对压力的变化保持稳健。
The high-pressure behavior of tetragonal barium carbodiimide (BaNCN) was investigated by in-situ high-pressure X-ray diffraction measurements and first-principles theoretical calculations. No phase transition or decomposition of tetragonal BaNCN was observed during compression to 6.0 GPa and subsequent decompression to ambient pressure. The bulk modulus estimated from the unit cell volume with respect to the applied pressure was 69(2) GPa, which is comparable to that estimated by first-principles calculations. The theoretical calculations indicate that contraction of the Ba-N bond length has a crucial effect on the volume change in response to pressure, whereas the C-N bonds in the NCN2-anions remain robust against the change in pressure.
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