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Microwave‐ versus Conventional‐Hydrothermal Synthesis of Hydroxyapatite Crystals from Gypsum
Author(s) -
Katsuki Hiroaki,
Furuta Sachiko,
Komarneni Sridhar
Publication year - 1999
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.1151-2916.1999.tb02073.x
Subject(s) - hydrothermal circulation , hydrogen phosphate , gypsum , hydrothermal synthesis , diammonium phosphate , materials science , microwave , mineralogy , chemical engineering , phosphate , nuclear chemistry , chemistry , composite material , metallurgy , potassium , organic chemistry , physics , quantum mechanics , engineering
Hydroxyapatite (HAp) crystals were synthesized from gypsum powder with diammonium hydrogen phosphate solution via microwave‐hydrothermal treatment at 100°C, and their properties were studied. Gypsum powder could be completely converted to fine HAp crystals 30‐300 nm long with 0.5 M diammonium hydrogen phosphate at 100°C in 5 min. Compared to the formation of HAp crystals via conventional‐hydrothermal treatment, microwave‐hydrothermal treatment led to increased rate of formation (by two orders of magnitude).