Crystal material and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11158784-B2
Application number	US-201716079522-A
Country	US
Kind code	B2
Filing date	Feb 24, 2017
Priority date	Feb 25, 2016
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

The present invention makes clear and defines a congruent composition of a langasite-based oxide, and establishes a method of manufacturing a crystal by any desired composition of AE3ME1+a(Ga1−xAlx)3+bSi2+cO14 (AE is an alkaline-earth metal, ME is Nb or Ta, 0≤x≤1, −0.5<a≤0 or 0<a<0.5, −0.5<b≤0 or 0<b≤0.5, and −0.5<c≤0 or 0<c<0.5, excluding a=b=c=0). This makes it possible to suppress the formation of an impurity, and improve the yield and crystal manufacturing rate. The raw material is a raw material mixture prepared by mixing an alkaline-earth metal or its carbonate or oxide, Nb or Ta or its oxide, Ga or its oxide, Al or its oxide, and Si or its oxide.

First claim

The invention claimed is:

1. A crystal material manufacturing method comprising:
a first step of preparing a raw material mixture by mixing a carbonate or oxide of an alkaline-earth metal, an oxide of Nb or Ta or a mixture of an Nb oxide and a Ta oxide, an oxide of Ga, a carbonate or oxide of RE, and Si or an oxide thereof, so as to obtain each cation ratio indicated by any desired congruent composition of AE 3 ME 1+a (Ga 1−x RE x ) 3+b Si 2+c O 14 (AE is an alkaline-earth metal, ME is Nb or Ta, RE is at least one of Y, Sc, and lanthanoide, 0≤x≤1, −0.5<a<0.5, −0.5<b<0.5, and −0.5<c<0.5);
a second step of melting the raw material mixture; and
a third step of forming a crystal material made of a langasite-based oxide having the desired congruent composition by cooling the melted raw material mixture, and
wherein AE=Ca, ME=Ta, and RE=Sc, and a≠0.0, b≠0.0, and c≠0.0.

2. A crystal material comprising a langasite-structure oxide having any congruent composition of AE 3 ME 1+a (Ga 1−x RE x ) 3+b Si 2+c O 14 (AE is an alkaline-earth metal, ME is Nb or Ta, RE is at least of one T, Sc, and lanthanoide, 0≤x≤1, −0.5<a<0.5, −0.5<b<0.5, and −0.5<c<0.5) wherein AE=Ca, ME=Ta, and RE=Sc, and a≠0.0, b≠0.0, and c≠0.0.

Assignees

• Piezo Studio Inc
• Univ Tohoku

Inventors

• Yoshikawa Akira
• Yokota Yuui
• Ohashi Yuji
• Kamada Kei
• Kudo Tetsuo
• Inoue Kenji
• Shoji Yasuhiro
• Igarashi Yu
• Arakawa Mototaka
• Kurosawa Shunsuke
• Yamaji Akihiro

Classifications

• C30B29/34 Primary

  Silicates · CPC title

• C30B11/00

  Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method (C30B13/00, C30B15/00, C30B17/00, C30B19/00 take precedence; under a protective fluid C30B27/00) · CPC title

• C30B15/08

  Downward pulling · CPC title

• C01P2004/02

  obtained by optical microscopy · CPC title

• C01B33/26

  Aluminium-containing silicates {, i.e. silico-aluminates} · CPC title