High-Pressure Synthesis and Crystal Structure of MoC-Type Tungsten Nitride by Nitridation with Ammonium Chloride.,Inorganic Chemistry

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High-Pressure Synthesis and Crystal Structure of MoC-Type Tungsten Nitride by Nitridation with Ammonium Chloride.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-12-03 , DOI: 10.1021/acs.inorgchem.9b01945
Takuya Sasaki ₁ , Takahide Ikoma ₁ , Kazuki Sago ₂ , Zheng Liu ₃ , Ken Niwa ₁ , Tetsu Ohsuna ₁ , Masashi Hasegawa ₁

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A novel tungsten nitride, MoC-type WN, was synthesized at 6 GPa and 1200 °C via nitridation of tungsten by ammonium chloride as a nitrogen source. This compound is isostructural with γ'-MoC, which has a hexagonal structure with a space group of P63/mmc (No. 194). Micrometer-sized single crystals of MoC-type WN were grown in molten ammonium chloride flux. In addition, NaCl-type WN and WC-type WN were synthesized via nitridation by ammonium chloride at 6 GPa and 1000 °C. Ammonium chloride is appropriate as a nitrogen source for nitride synthesis under high pressure. The new WN phase crystallizes in the hexagonal structure with unit cell parameters of a = 2.89248(2) Å and c = 10.17069(7) Å. The chemical formula of MoC-type WN refined by the Rietveld analysis from powder X-ray diffraction data was WN0.60(1). The zero-pressure bulk modulus, K0, of MoC-type WN was determined to be 338(3) GPa, which can be expected to be a hard material.

中文翻译：

MoC型氮化钨的氯化铵氮化高压合成及晶体结构。

通过以氯化铵为氮源对钨进行氮化，在6 GPa和1200°C的温度下合成了一种新型的氮化钨MoC型WN。该化合物与γ'-MoC是同构结构，具有六边形结构，空间群为P63 / mmc（编号194）。MoC型WN的微米级单晶在熔融氯化铵助熔剂中生长。另外，通过氯化铵在6 GPa和1000°C的条件下进行氮化，合成了NaCl型WN和WC型WN。氯化铵适合作为高压下氮化物合成的氮源。新的WN相以六边形结构结晶，晶胞参数为a = 2.89248（2）Å和c = 10.17069（7）Å。通过Rietveld分析从粉末X射线衍射数据中纯化得到的MoC型WN的化学分子式为WN0.60（1）。零压力体积模量K0

更新日期：2019-12-03

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