JPS59162197A - Production of artificial crystal of ruby by f.z. process - Google Patents

Abstract

PURPOSE:To produce an artificial ruby crystal having large diameter, stably in high rate of growth, by using a raw material of ruby doped with a specific metal oxide in the titled preparation process, thereby changing the spectroscopic properties of the crystal. CONSTITUTION:One or more metal oxides such as TiO2, FeO, Fe2O3, SiO2, V2O5, etc. are used as a dopant. A ruby raw material composed of about 96% of aluminium oxide and about 2.5% of chromium oxide is doped with about 1.5% of the above metal oxides, and is sintered at about 1,650 deg.C for about 5hr. The obtained sintered product is set together with a seed crystal in an FZ-furnace, and the crystal growth is carried out in the atmosphere of argon or nitrogen gas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing artificial ruby crystals using the F, Z method, in which a metal oxide is added to alumina and chromium oxide, which are raw materials for ruby.

Conventionally, in the method for producing artificial ruby crystals by the F, Z method, the raw material used was alumina (A4o) chromium oxide (Cr203). Chromium oxide is an additive that replaces chromium atoms with aluminum atoms and makes the crystal red in color, but for practical purposes it is necessary to add it at a weight concentration of about 2 to 4%. Therefore, the crystal has a bright red color and 6
Since light with a wavelength shorter than 00 nm is absorbed near the surface, only the surface of the raw material dissolves, making stable crystal growth impossible and making it difficult to produce ruby with a diameter of 6 nm or more. Ta.

The present invention has been made in view of these points, and its purpose is to change the spectral properties or viscosity of the crystal by adding metal oxides, promote stable ruby crystal growth, and improve production efficiency. The goal is to raise the throughput.

In the present invention, the metal oxide used is TiO2.

FeO, Fe20j, 2 1 2 5
1000, CuO, V○, or a combination of some of them.

For example, FeO, Fe2O, absorbs light with a wavelength longer than 600 ntn, and since the wavelength is long, the attenuation distance of light becomes long, so that not only the surface but also the inside dissolves.

Alternatively, when TiO2 and Fe2O3 are added together, they absorb light with a long wavelength of 600 tctn or more in the same way as described above, making stable crystal growth possible, and therefore making it possible to produce artificial ruby crystals with a diameter larger than conventional ones. Become.

In the present invention, since the metal oxide used also has a coloring effect, argon or N2 gas is used as the atmospheric gas to prevent it from being included in the crystal.

Hereinafter, the remarkable effects of the present invention will be specifically described according to Examples.

Example 1 96% alumina oxide (A t20s ) as a raw material,
Add 2.5% chromium oxide (Or203) and 15% iron oxide (Fe203) as a metal oxide, and after mixing, 16%
Sintered at 50°C for 1.5 hours and used as raw material for F and Z.

The diameter of the raw material is 15 g.Next, the raw material and seed crystal are set in the Y and Z furnaces, and ruby crystal growth is performed. At this time, the atmosphere was nitrogen gas, and when grown for 0.50 sa, even crystals with a large diameter, which were conventionally grown, were able to grow stably, and the throughput was more than 6 times. Iron has no effect on the color of ruby.

Example 2 Crystal growth was performed in the same manner as in Example 1 by adding 97% alumina oxide, 25% chromium oxide, and 15% silicon oxide (S102). The diameter of the raw material is 121al. S
Since in improves the viscosity, stable growth was possible without any molten part peculiar to the F and Z methods. The throughput was more than four times as large.

Example 6 In the same manner as in Example 1, 94% alumina oxide, 20% chromium oxide, and 20% iron oxide (Fe20.) as metal oxide.
, titanium oxide (v 1.o,, ) 2. o% addition [
~, crystal growth was performed. The raw material diameter is 18 words. Ar gas was used as the atmosphere. As a result, it was possible to grow even large diameter plants that were previously impossible, and the throughput was nine times higher.

that's all

Claims (1)

[Claims] A method for producing artificial ruby crystals using the F, Z, method, which is characterized by adding a metal oxide to alumina and chromium oxide, which are raw materials for ruby.