Vanadium garnet materials in the MnO-CaO-V.sub.2 0.sub.3 -SiO.su

Details Vanadium garnet materials in the MnO-CaO-V.sub.2 0.sub.3 -SiO.su Vanadium garnet materials in the MnO-CaO-V.sub.2 0.sub.3 -SiO.su

1991-08-12

1992-11-10

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Synthetic precious stones

501 73, 264 65, C30B 2900

Patent

active

051622688

ABSTRACT:
Vanadium garnet materials and a method for their preparation. The vanadium garnet material has a trivalent vanadium cation and a composition that falls within a specific prismatic-shaped volume in a quaternary composition diagram of MnO, CaO, V.sub.2 O.sub.3, and SiO.sub.2. In the process, specific amounts of separately pre-heated V.sub.2 O.sub.3, MnO, CaO and SiO.sub.2 powders are ground and mixed together, pelletized, heated at a temperature in the range of about 1100.degree. C. to 1400.degree. C. for 12 to 48 hours in an atmosphere of carefully selected oxygen pressure comprising a gas mixture of high purity CO.sub.2 and H.sub.2 to produce a liquid melt, and cooling, crystallizing out and separating said vanadium garnet material. A typical vanadium garnet material has the formula Mn.sub.1.3 Ca.sub.1.7 V.sub.2 Si.sub.3 O.sub.12. The vanadium garnet materials may be used in laser applications.

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