Langasite-type oxide material, method for producing same, and raw material used in the production method
An oxide material having a langasite-type structure having a desired surface condition and a desired outer shape is obtained stably. By adding at least one selected from the group consisting of Ir, Pt, Au, and Rh to a raw material which is a composition used for producing a desired oxide material as an additive element, it is possible to control the wettability between a die portion at a bottom end of a crucible and a melt of the raw material, thereby implementing stable production of the oxide material while controlling the wetting and spread of the melt of the raw material leaked out through a hole of the crucible.
1. A langasite oxide material, comprising:
at least one element selected from the group consisting of Ir, Pt, Au, and Rh as an additive element; and
at least one of a compound represented by formula:
AE 3 TaGa 3-X Al X Si 2 O 14 ,
wherein AE represents an alkaline earth metal element selected from the group consisting of Mg, Ca, Sr, and Ba, and 0≦X≦3, or
a compound represented by formula:
AE 3 NbGa 3-X Al X Si 2 O 14 ,
wherein AE represents an alkaline earth metal element selected from the group consisting of Mg, Ca, Sr, and Ba and 0≦X≦3.
2. The langasite oxide material according to claim 1 , having a melting temperature of less than 1470° C.
3. The langasite oxide material according to claim 1 , wherein X is of 0<X≦3.
4. An oxide material, comprising:
at least one element selected from the group consisting of Ir, Pt, Au, and Rh as an additive element, and
at least one compound represented by Ca 3 TaGa 3-X Al X Si 2 O 14 (0≦X≦3), Ca 3 NbGa 3-X Al X Si 2 O 14 (0≦X≦3), Sr 3 TaGa 3-X Al X Si 2 O 14 (0≦X≦3), or Sr 3 NbGa 3-X Al X Si 2 O 14 (0≦X≦3).
5. The oxide material according to claim 4 , having a melting temperature of less than 1470° C.
6. The oxide material according to claim 4 , wherein X is of 0<X≦3.
7. A single crystal, comprising the langasite oxide material according to claim 1 .
8. A single crystal, comprising the oxide material according to claim 4 .