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Hydrothermal Preparation and Morphology Characteristics of Y 3 Fe 5 O 12
Author(s) -
Cho Yong S.,
Burdick Ver L.,
Amarakoon Vasantha R. W.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03025.x
Subject(s) - hydrothermal circulation , morphology (biology) , materials science , mineralogy , hydrothermal synthesis , crystallography , chemical engineering , geology , chemistry , paleontology , engineering
The influences of processing parameters such as mineralizer, temperature, and nonstoichiometry on reaction product and morphology were investigated in the hydrothermal synthesis of yttrium iron garnet, Y 3 Fe 5 O 12 (YIG). A cubic YIG phase was synthesized successfully under hydrothermal conditions of 200°C and 6 h from yttrium and iron hydroxide coprecipitates obtained by adjusting the pH to 10.5 using NH 4 OH. The other mineralizer, NaOH, was not effective in forming the garnet phase. Nonstoichiometric compositions utilizing excess Y content tended to increase the yield of the garnet phase, but did not affect the morphology. Different morphology characteristics were observed by changing the synthesis temperature. Isometric YIG particles disappeared at a relatively high temperature of 250°C, resulting in irregular star‐shaped particles of YIG due to the preferential orientation during particle growth.