METHOD OF PRODUCING FILM OF SURFACE Nb-CONTAINING La-STO CUBIC CRYSTAL PARTICLES

摘要

There are provided a film of surface Nb-containing La-STO cubic crystal particles that is effective as, for example, a thermoelectric conversion material for use at low temperatures of around room temperature, and an art for producing this film. The production method includes preparing a mixed aqueous solution in which an La-containing compound, an Sr-containing compound, a six-fold coordinated Ti complex compound, and an amphiphilic compound are dissolved; growing cubic-form crystals formed of La-doped STO in the mixed aqueous solution by a hydrothermal synthesis method; obtaining surface Nb-containing La-STO cubic crystal particles by dissolving a niobium-containing compound in this mixed solution and heating; and forming a particle film in which the surface Nb-containing La-STO cubic crystal particles are bonded, by disposing the surface Nb-containing La-STO cubic crystal particles on a substrate and carrying out firing.

主权项

1. A method for producing a film of surface Nb-containing La-STO cubic crystal particles, comprising:
preparing a mixed aqueous solution being dissolving a lanthanum-containing compound, a strontium-containing compound, a six-fold coordinated titanium complex compound, and an amphiphilic compound; growing cubic-form crystals formed of strontium titanate (STO) doped with lanthanum, from the mixed aqueous solution by a hydrothermal synthesis method; dissolving a niobium-containing compound in the mixed solution containing the cubic-form crystal and holding in the temperature range from 150□C to 300□C to obtain surface Nb-containing La-STO cubic crystal particles by epitaxially growing an Nb-containing phase on a surface of the cubic-form crystals; supplying the solution containing the surface Nb-containing La-STO cubic crystal particles onto a substrate and removing a solvent from the solution to dispose the surface Nb-containing La-STO cubic crystal particles on the substrate; and firing the substrate on which the surface Nb-containing La-STO cubic crystal particles are disposed to forming a particle film consisting of the bonded surface Nb-containing La-STO cubic crystal particles.