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INVENTION
Patent of the Russian Federation RU2093617
MONOCRYSTALLINE JEWELRY MATERIAL
Applicant's name: Bakunov Oleg Valerievich; Lingart Yuriy Karlovich
The name of the inventor: Bakunov Oleg Valerevich; Lingart Yuriy Karlovich
The name of the patent holder: Bakunov Oleg Valerevich; Lingart Yuriy Karlovich
Address for correspondence:
Date of commencement of the patent: 1996.09.26
Use: The invention relates to crystalline materials used in the jewelry industry. SUMMARY OF THE INVENTION: a monocrystalline jewelry material contains zirconia or hafnium stabilizing metal oxide from a series of calcium, magnesium, yttrium and dopant-coloring oxides of rare earth elements to simulate natural alexandrite contains, as coloring additives, praseodymium and neodymium oxides in a ratio of 0.5 -2.5 at their total content of 5-11% by weight.
DESCRIPTION OF THE INVENTION
The invention relates to the field of crystalline materials used in the jewelry industry.
The use of artificially obtained crystals in the jewelry industry is economically very profitable, since the reserves of natural crystals on one side are limited, and on the other hand their extraction is a very expensive production. Artificial crystals synthesized from melt simulating the color of natural alexandrite are known, but in reality they are synthetic corundums colored with vanadium. [1] These crystals have a purple color, which under artificial lighting changes to a red one, but the color change is much smaller than that of natural alexandrite. A crystal synthesized from a melt and simulating chrysoberyl, which has an average or dense green color, is also known. The shortcomings of this crystal include a fairly weak dichroism, and the need to use beryllium salts for the synthesis. In composition, the crystal is actually a beryllium-aluminum oxide with the formula BeAl 2 O 4 [2]
In the invention, these drawbacks are eliminated by the fact that a single crystal jewelry material containing zirconia or hafnium stabilizing metal oxide from a range of calcium, magnesium, yttrium and doping-coloring oxides of rare earth elements, to simulate natural alexandrite as coloring additives, the crystal contains praseodymium and neodymium oxides With respect to the first to the second of 0.5 to 2.5, with a total content of these oxides of from 5 to 11 wt.
Examples of the chemical composition of a single-crystal jewelry material allowing to have a different degree of color and dichroism, Calcium, magnesium, or yttrium oxide 16-30 (16-30, 16-30, 16-30); Oxide of praseodymium 3 (5, 3, 5); Neodymium oxide 2 (6, 6, 2); Zirconium oxide and hafnium remainder.
Accordingly, intermediate concentrations of oxides of praseodymium and neodymium are possible.
The main advantage of this crystal is that, by varying the percentage of oxides of praseodymium and neodymium, the color and degree of dichroism can be varied within a wide range.
CLAIM
A single crystal jewelry material containing zirconium dioxide or hafnium stabilizing metal oxide from a series of calcium, magnesium, yttrium and doping-coloring oxides of rare earths, characterized in that in order to mimic natural alexandrite as coloring additives, the crystal contains praseodymium and neodymium oxides with respect to the first The second from 0.5 to 2.5 with a total content of these oxides of 5 11 wt.
print version
Date of publication 09.12.2006гг
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