Process for producing single crystal of garnet ferrite
First Claim
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1. A process for producing a single crystal of garnet ferrite, consisting essentially of the step of subjecting raw materials for the garnet ferrite, said raw materials comprising an admixture of simple oxides, to sintering at a temperature between 1350°
- and 1550°
C., such that unequal grain growth results in a conversion of said raw materials into a crystalline structure comprising a few grains which are much larger than surrounding grains, said crystalline structure having the formula;
space="preserve" listing-type="equation">Ca.sub.x M.sub.3-x N.sub.5 O.sub.12wherein (i) M is at least one of yttrium and a rare earth element, (ii) x satisfies the relationship;
space="preserve" listing-type="equation">0.01≦
x≦
1.0,and (iii) N is a component comprised of iron, an a-site element and a d-site element, said a-site and d-site elements being present in amounts, respectively, such that electrical neutrality is maintained in said structure.
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Abstract
A process for producing a signal crystal of garnet ferrite comprises causing a signal crystal to grow by subjecting raw materials for the garnet ferrite to sintering so as to utilize the anomalous grain growth induced by the sintering. The process requires a shorter period of time for the growth of the single crystal, is free from mixing of impurities, and is capable of producing a single crystal with a high Faraday rotation while reducing production cost for the crystal.
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13 Claims
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1. A process for producing a single crystal of garnet ferrite, consisting essentially of the step of subjecting raw materials for the garnet ferrite, said raw materials comprising an admixture of simple oxides, to sintering at a temperature between 1350°
- and 1550°
C., such that unequal grain growth results in a conversion of said raw materials into a crystalline structure comprising a few grains which are much larger than surrounding grains, said crystalline structure having the formula;
space="preserve" listing-type="equation">Ca.sub.x M.sub.3-x N.sub.5 O.sub.12wherein (i) M is at least one of yttrium and a rare earth element, (ii) x satisfies the relationship;
space="preserve" listing-type="equation">0.01≦
x≦
1.0,and (iii) N is a component comprised of iron, an a-site element and a d-site element, said a-site and d-site elements being present in amounts, respectively, such that electrical neutrality is maintained in said structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- and 1550°
Specification