Method for producing perovskite metal oxynitride

Patent metadata

Field	Value
Publication number	US-9776866-B2
Application number	US-201515125469-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Mar 13, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

The method for producing a perovskite metal oxynitride of the present invention, comprises: a hydrogenation step (A) of forming a perovskite oxyhydride in which an oxide ion (O2−) and a hydride ion (H−) coexist, by reducing a perovskite oxide through a reductive oxygen elimination reaction using a metal hydride; and a nitriding step (B) of forming a perovskite oxynitride containing a nitride ion (N3−) by heat-treating the perovskite oxyhydride in the presence of a nitrogen source substance at a temperature of 300° C. or higher and 600° C. or lower and exchanging the hydride ion (H−) for a nitride ion (N3−).

First claim

The invention claimed is:

1. A method for producing a perovskite metal oxynitride, comprising:
a hydrogenation step (A) of forming a perovskite oxyhydride in which an oxide ion (O 2− ) and a hydride ion (H − ) coexist, by reducing a perovskite oxide through a reductive oxygen elimination reaction using a metal hydride; and
a nitriding step (B) of forming a perovskite oxynitride containing a nitride ion (N 3− ) by heat-treating the perovskite oxyhydride in the presence of a nitrogen source substance at a temperature of 300° C. or higher and 600° C. or lower and exchanging the hydride ion (H − ) for a nitride ion (N 3− ).

2. The method for producing a perovskite metal oxynitride according to claim 1 wherein the nitrogen source substance in the nitriding step (B) is an ammonia gas flow.

3. The method for producing a perovskite metal oxynitride according to claim 1 wherein the nitrogen source substance in the nitriding step (B) is an ammonia gas-generating agent.

4. The method for producing a perovskite metal oxynitride according to claim 1 wherein the nitrogen source substance in the nitriding step (B) is a nitrogen gas flow.

5. The method for producing a perovskite metal oxynitride according to claim 1 wherein the perovskite oxide is a compound represented by the formula A n+1 B n O 3n+1 (in the formula, n is any one of 1, 2, 3 and ∞, A is at least one of Ca, Ba, Sr, Pb and Mg, and B is at least one of Co, W, Mo, V, Ta, Zr, Nb, Ti and Hf), and the perovskite oxyhydride is a compound represented by the formula A n+1 B n (O 1-x H x ) 3n+1 (in the formula, A and B are the same as those of the starting substance, H is a hydride ion (H − ) which has substituted an oxide ion, 0.01≦x≦0.2, and n is any one of 1, 2, 3 and ∞).

6. The method for producing a perovskite metal oxynitride according to claim 1 wherein the forms of the perovskite oxide, the perovskite oxyhydride and the perovskite metal oxynitride are powder or a thin film.

Assignees

• Japan Science & Tech Agency

Inventors

• Kageyama Hiroshi
• Kobayashi Yoji
• AIZU Kohei
• YOSHIMUNE Wataru
• Hosono Hideo

Classifications

• C01G23/006

  Alkaline earth titanates · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01B21/0821 Primary

  Oxynitrides of metals, boron or silicon · CPC title

• C30B29/38

  Nitrides · CPC title

• C01P2002/34

  perovskite-type (ABO3) · CPC title