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Dislocations in magnetic garnet crystals
Author(s) -
Gendelev S. Sh.,
Fedorovich L. D.,
Titova A. G.
Publication year - 1971
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19710060411
Subject(s) - dislocation , materials science , crucible (geodemography) , crystal (programming language) , crystallization , condensed matter physics , crystallography , dislocation creep , heat flow , thermodynamics , composite material , chemistry , thermal , physics , computational chemistry , computer science , programming language
1. Dislocations in magnetic flux‐grown garnet crystals (Y 3 Fe 5 O 12 and others) have been observed. As a rule, {110} growth pyramids have more defects than {211} ones. 2. The highest content of defects (dislocation density 10 3 –10 4 cm −2 ) is observed in Y 3 Fe 5 O 12 that grows on crucible walls adjacent to the free surface of the solution where the flow of heat is not uniform to the greatest degree. Bottom grown crystals usually have less dislocations. Far fewer dislocations are in wall grown crystals, least of all dislocations are contained in crystals that grow inside the solution. The solution pouring off at the end of the crystallization period increases dislocation density by some dozens. 3. Heat treatment decreases dislocation density. The less dislocation content and the lower ordering are in the initial crystal, the higher heat treatment effectiveness.