Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 315, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2022.123508
Keywords
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Funding
- MEXT Elements Strategy Initiative to Form Core Research Center
- [JPMXP0112101001]
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Perovskite-type LaWN3 was synthesized via solid-state metathesis reaction and showed a lower oxygen content compared to the sample prepared by conventional ammonolysis. The x-ray diffraction pattern indicated either a meta-stable cubic structure or a ground-state rhombohedral structure. The synthesized material exhibited a certain band gap.
Perovskite-type LaWN3 was synthesized by the solid-state metathesis reaction of LaCl3, WCl6, and Li3N under a pressure of 5 GPa and a temperature of 1573 K. The amount of oxygen in the synthesized sample is smaller than that in the sample prepared by the conventional ammonolysis of La2W2O9. The x-ray diffraction pattern of resulting phase can be fitted by either the meta-stable cubic structure with a Pm3m space group or the ground-state rhombohedral structure with an R3c space group. The indirect bandgap of-1.2 eV and the direct band gap of-2.2 eV are consistent with those of the rhombohedral structure calculated by the density functional theory calculation with the HSE06 hybrid functional.
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