Development of Low-Temperature Synthesis of Metal Nitride Single Crystals and Powders Using Metal Oxides and Solid Nitrogen Sources

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K21231
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Tohoku University
• Principal Investigator: Yamada Takahiro 東北大学, 多元物質科学研究所, 教授 (10358260)
• Project Period (FY): 2020-07-30 – 2022-03-31
• Keywords: 金属窒化物 / 固体窒素源 / 低温合成 / 単結晶 / 粉末

Outline of Final Research Achievements

A new low temperature synthesis method of single crystal grains and powders of metal nitrides using metal oxides and solid nitrogen sources has been developed. It was clarified that aggregates of single crystal grains of TiN, VN, NbN, TaN and Cr2N and powder particles were obtained at 900 -1100 °C using oxides of Ti, V, Nb, Ta and Cr as raw materials. This process is a metathesis reaction in a broad sense in which oxygen of metal oxide and nitrogen of BN are exchanged through the formation of sodium borates.

Free Research Field

固体材料化学

Academic Significance and Societal Importance of the Research Achievements

金属窒化物の単結晶粒や粉末を，安価で取り扱いが容易な金属酸化物と固体窒素源を原料に用いて常圧・低温条件下で合成する新しいプロセスを開発した．このプロセスの反応メカニズムは，副生成物であるナトリウムホウ酸塩を介した 金属酸化物の酸素とBNの窒素が入れ替わるメタセシス反応であり，今後，金属窒化物の工業的な低温合成プロセスへの応用が期待される．