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Structure of gallium‐doped mayenite and its reduction behaviour
Author(s) -
Palacios Luis,
Bruque Sebastián,
Aranda Miguel A. G.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200743425
Subject(s) - gallium , amorphous solid , crystallography , doping , decomposition , materials science , crystal structure , powder diffraction , rietveld refinement , neutron diffraction , chemistry , metallurgy , organic chemistry , optoelectronics
The isovalent Al/Ga substitution in mayenite has been studied by preparing the (Ca 12 Al 14– x Ga x O 32 )O 1 □ 5 series. Single phase compounds can be prepared up to x = 1 and the structure of this compound has been studied by joint Rietveld analysis of neutron and X‐ray powder diffraction data. The results showed that gallium substitutes aluminium, which provokes the expansion of the unit cell, as expected. (Ca 12 Al 13 GaO 32 )O 1 □ 5 has been treated at high temperature under strong reducing conditions to prepare an electride derivative. Unfortunately, instead the reduction leaving electrons into the mayenite cages, the Ga‐doped mayenite undergoes decomposition. The initial compound transforms to Ca 3 Al 2 O 6 , (Ca 12 Al 14 O 32 )O 1 □ 5 and amorphous Ga metal, which is likely deposited on the mayenite crystal surfaces. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)