Method for producing single crystal of composite oxide

Details Method for producing single crystal of composite oxide Method for producing single crystal of composite oxide

2005-03-01

2005-03-01

Kunemund, Robert (Department: 1765)

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from solid or gel state

C117S007000, C117S008000, C117S010000, C117S944000

Reexamination Certificate

active

06860938

ABSTRACT:
The present invention provides a method by which an oxide material having excellent thermoelectric conversion performance can be produced by a simple process. Specifically, the present invention provides a method for producing a composite oxide single crystal in which a mixture of raw substances including a Bi-containing substance, a Sr-containing substance, a Ca-containing substance, a Co-containing substance and a Te-containing substance, or a mixture of raw substances also including a Pb-containing substance in addition to the above-mentioned substances, is heated in an oxygen-containing atmosphere at a temperature below the melting point of any of the raw substances. The composite oxide single crystal produced by the method of the present invention is a ribbon-shaped fibrous single crystal that is about 10 to 10,000 μm long, about 20 to 200 μm wide, and about 1 to 5 μm thick. According to the method of the present invention, a composite oxide single crystal with excellent thermoelectric conversion performance can be produced simply by heating a mixture of raw substances at a relatively low temperature, below the melting point of any of the raw substances, meaning that a relatively easy and safe heat treatment operation can be performed, which contributes to cost reduction.

REFERENCES:
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Ryoji Funahashi, et al., “An Oxide Single Crystal with High Thermoelectric Performance in Air,” Japanese Journal of Applied Physics, vol. 39, No. 11B, pp. 1127-1129 Nov. 15, 2000.

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