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Divalent Europium Glasses

IP.com Disclosure Number: IPCOM000094181D
Original Publication Date: 1966-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Giess, EA: AUTHOR [+2]

Abstract

This describes a new series of glasses containing divalent europium and having compositions in the ternary system EuO-B(2)O(3)-Al(2)O(3). Chemically stable glasses of good optical quality are made with EuO concentrations varying from 3 to 43 mol percent. Verdet constants as large as -2.55 min/Oe-crn are obtained.

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Divalent Europium Glasses

This describes a new series of glasses containing divalent europium and having compositions in the ternary system EuO-B(2)O(3)-Al(2)O(3). Chemically stable glasses of good optical quality are made with EuO concentrations varying from 3 to 43 mol percent. Verdet constants as large as -2.55 min/Oe-crn are obtained.

In the formation of these glasses, the starting materials are europous oxide EuO, anhydrous B(2)O(3), chemical analysis showed it to contain less than 0.4% water, and high purity aluminum oxide. It is essential that europous oxide rather than europic oxide Eu(2)O(3) be used. This is because the latter cannot be completely reduced in the glass forming process, even in pure hydrogen. After thorough mixing and shaking, the mixture is melted in an inductively heated carbon crucible. During melting, it is necessary to remove all traces of oxygen and water vapor from the atmosphere. This is done by using purified argon or hydrogen, the latter being more effective in maintaining the desired oxidation state of europiurn. It is necessary in some cases to first fuse the boric oxide and the aluminum oxide into a homogeneous frit. By doing this for a series of B(2)O(3):Al(2)O(3) ratios and reacting the EuO with the analyzed product, better control over the final glass composition is attained.

Meltings are carried out in the temperature range of 1175 to 1300 degrees C with soak periods of several hours at the temperature chosen. All glass specimens are chemically analyzed for divalent europium, total europium, boron, and aluminum.

Drawing 1 shows the glass forming region of the EuO-B(2)O(...