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Method of Fabricating Dense Single Phase Ferromagnetic Ceramics of Europium II Sulfide

IP.com Disclosure Number: IPCOM000096518D
Original Publication Date: 1963-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Shafer, MW: AUTHOR

Abstract

Ferromagetic ceramic bodies of EuS are fabricated by the following procedure: 1. EuCO(3) or EuSO(4) is prepared from Eu(2)O(3) according to the procedures described by Cooley and Yost in Inorganic Synthesis, Vol. 5, 1956. 2. The pure EuCO(3) or EuSO(4) powder is placed on a platinum lined boat in a gas-tight furnace. This furnace is first flushed with pure hydrogen to remove all traces of oxygen. 3. The temperature is then raised to greater than 700 degrees C, e.g., 700 degrees - 1200 degrees C over a period of about 1 hour in pure hydrogen. 4. Hydrogen sulfide (H(2)S) is then mixed with the hydrogen (25-70%) and passed over the sample for from 1-5 hours.

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Method of Fabricating Dense Single Phase Ferromagnetic Ceramics of Europium II Sulfide

Ferromagetic ceramic bodies of EuS are fabricated by the following procedure: 1. EuCO(3) or EuSO(4) is prepared from Eu(2)O(3) according to the procedures described by Cooley and Yost in Inorganic Synthesis, Vol. 5, 1956.
2. The pure EuCO(3) or EuSO(4) powder is placed on a platinum lined boat in a gas-tight furnace. This furnace is first flushed with pure hydrogen to remove all traces of oxygen. 3. The temperature is then raised to greater than 700 degrees C, e.g., 700 degrees - 1200 degrees C over a period of about 1 hour in pure hydrogen. 4. Hydrogen sulfide (H(2)S) is then mixed with the hydrogen (25- 70%) and passed over the sample for from 1-5 hours. The H(2)S concentration is then reduced to about 10% and the furnace cooled to 400 degrees - 600 degrees C at which point the H(2)S is completely shut off and the sample cooled to room temperature in pure hydrogen in about 5 minutes. 5. The mass is then removed from the furnace and transferred to a dry box through which dry nitrogen is flowing. The particle size is reduced by grinding in the absence of water vapor and air. It is then pressed into the desired shape without the addition of binder. 6. The green ceramic body of EuS is then placed in a gas- tight furnace and slowly, e.g., 1-2 hours, heated to greater than 1000 degrees C, e.g., 1100 degrees - 1300 degrees C, in a hydrogen atmosphere. Several per cent (5-20%) H(2)S...