HEAT-RESISTANT SYNTHETIC JEWELLERY MATERIAL Russian patent published in 2015 - IPC A44C27/00 C03C10/12 C30B29/20 C30B29/34 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to materials for the jewellery industry. A transparent, semitransparent or nontransparent composite nanocrystalline material based on nanosized oxide and silicate crystalline phases contains one of the following crystalline phases: spinel, quartz-like phases, sapphirine, enstatite, petalite-like phase, cordierite, willemite, zirconium, rutile, zirconium titanate, zirconium dioxide with content of ions of transition elements, rare-earth elements and precious metals of 0.001 to 4 mol%. One of the crystalline phases is additionally quartz-like solid solutions of lithium magnesium zinc aluminosilicates with a virgilite structure of the following composition, mol%: SiO₂ - 45-72; Al₂O₃ - 15-30; MgO - 0.1-23.9; ZnO - 0.1-29; Li₂O - 1-18; PbO - 0.1-7.0; ZrO₂ - 0.1-10; TiO₂ - 0.1-15; NiO - 0.001-4.0; CoO - 0.001-3.0; CuO - 0.001-4.0; Cr₂O₃ - 0.001-1.0; Bi₂O₃ - 0.001-3.0; Fe₂O₃ - 0.001-3.0; MnO₂ - 0.001-3.0; CeO₂ - 0.001-3.0; Nd₂O₃ - 0.001-3.0; Er₂O₃ - 0.001-3.0; Pr₂O₃ - 0.001-3.0; Au - 0.001-1.0.

EFFECT: invention increases heat resistance and reduces the coefficient of thermal expansion.

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