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Making Homogeneous LPE Fluxed Garnet Melts

IP.com Disclosure Number: IPCOM000080856D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gless, EA: AUTHOR [+2]

Abstract

There is described herein a method for producing homogeneous LPE (liquid phase epitaxy) garnet fluxed melts, which are suitable for use in the making of magnetic bubble films. These homogeneous melts, in accordance with this method, are produced simply and economically by calcining rare earth, RE (including yttrium), oxide constituents with sufficient Fe(2)O(3) (and Ga(2)O(3) or Al(2)O(3) if they are used) to make a RE(3)Fe(5)O(12) garnet solid compact prior to melting with the PbO and B(2)O(3) flux constituents, including the remaining excess Fe(2)O(3). The garnet solid compact is made by intimately mixing the constituent oxides such as, for example, by mortar and pestle or ball milling, and then cold compressing the powders and firing for more than 8 hours at 1350 degrees to 1400 degrees C in O(2) or air.

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Making Homogeneous LPE Fluxed Garnet Melts

There is described herein a method for producing homogeneous LPE (liquid phase epitaxy) garnet fluxed melts, which are suitable for use in the making of magnetic bubble films. These homogeneous melts, in accordance with this method, are produced simply and economically by calcining rare earth, RE (including yttrium), oxide constituents with sufficient Fe(2)O(3) (and Ga(2)O(3) or Al(2)O(3) if they are used) to make a RE(3)Fe(5)O(12) garnet solid compact prior to melting with the PbO and B(2)O(3) flux constituents, including the remaining excess Fe(2)O(3). The garnet solid compact is made by intimately mixing the constituent oxides such as, for example, by mortar and pestle or ball milling, and then cold compressing the powders and firing for more than 8 hours at 1350 degrees to 1400 degrees C in O(2) or air.

It has been found that the intimacy of mixing and the completeness of the reaction are improved if the solid compact is ground, mixed, pressed and fired more than once, before this prereacted garnet is ground and mixed with the PbO and B(2)O(3) flux constituents including the remaining excess Fe(2)O(3). The final melting and homogenization prior to film growth is suitably effected in a covered platinum crucible, at about 1150 to 1200 degrees C for at least 2 hours.

The method described herein takes advantage of the improved solubility of rare earth iron garnets (melt points about 1500 degrees C) compared with the less...