期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 19, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202014
关键词
Density Functional Theory; Disordered Compounds; High-Pressure Chemistry; Nitrides; Titanium
资金
- Deutsche Forschungsgemeinschaft DFG [SCHN 377/7, SCHN 377/18-1, OE 513/6-1, EXC 2089/1-390776260]
- PETRA III at DESY, a member of the Helmholtz Association [I-20191265]
- Projekt DEAL
TiP4N8 was synthesized from TiN and P3N5 using NH4F as a mineralizer, resulting in two polymorphs with different structures and prism shapes. The measured band gaps were confirmed by DFT calculations, which also predicted the thermochemistry of the polymorphs.
TiP4N8 was obtained from the binary nitrides TiN and P3N5 upon addition of NH4F as a mineralizer at 8 GPa and 1400 degrees C. An intricate interplay of disorder and polymorphism was elucidated by in situ temperature-dependent single-crystal X-ray diffraction, STEM-HAADF, and the investigation of annealed samples. This revealed two polymorphs, which consist of dense networks of PN4 tetrahedra (degree of condensation kappa=0.5) and either augmented triangular TiN7 prisms or triangular TiN6 prisms for alpha- and beta-TiP4N8, respectively. The structures of TiP4N8 exhibit body-centered tetragonal (bct) framework topology. DFT calculations confirm the measured band gaps of alpha- and beta-TiP4N8 (1.6-1.8 eV) and predict the thermochemistry of the polymorphs in agreement with the experiments.
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