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Hydration of Germanium Oxide Carnotite
Author(s) -
Martin Roger I.,
Brown Paul W.
Publication year - 1992
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.1151-2916.1992.tb04184.x
Subject(s) - germanate , calcium hydroxide , germanium , oxide , hydrate , microstructure , materials science , mineralogy , calcium , calcium oxide , chemical engineering , hydroxide , inorganic chemistry , chemistry , composite material , metallurgy , silicon , organic chemistry , engineering , optoelectronics , doping
The quaternary invariant point was reached in the CaO–GeO 2 –P 2 O 5 –H 2 O system by the hydration of germanium oxide carnotite. Complete reaction was achieved although the kinetics were very slow. Three products were identified by X‐ray diffraction: calcium germanate hydrate, hydroxyapatite, and calcium hydroxide. Energy dispersive X‐ray analyses established the compositions of the three phases present in the heterogeneous microstructure. Calcium germanate hydrate exhibited a fibrous habit and was present as large individual fibers as well as small thin fibers. The small fibers were intermixed with hydroxyapatite. The latter was observed to form feltlike assemblages. Stacked calcium hydroxide plates were unequivocally observed.