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Optical Properties of Zinc Aluminate, Zinc Gallate, and Zinc Aluminogallate Spinels
Author(s) -
Sampath Suresh K.,
Cordaro James F.
Publication year - 1998
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.1151-2916.1998.tb02385.x
Subject(s) - zinc , corundum , spinel , aluminate , wurtzite crystal structure , materials science , ultraviolet , crystal structure , crystal (programming language) , mineralogy , analytical chemistry (journal) , inorganic chemistry , crystallography , chemistry , metallurgy , optoelectronics , chromatography , cement , computer science , programming language
The optical spectra of zinc aluminate (ZnAl 2 O 4 ), zinc gallate (ZnGa 2 O 4 ), and zinc aluminogallate (ZnAlGaO 4 ) spinel powders were studied at wavelengths in the range of 250‐900 nm using reflectance spectroscopy. The ZnAl 2 O 4 and ZnGa 2 O 4 powders were synthesized by using conventional ceramic processing techniques and had systematic variations in the molar ratio of ZnO to M 2 O 3 (M = Al or Ga). The cubic spinel crystal structure of each composition was confirmed via powder X‐ray diffractometry. The ZnAl 2 O 4 powders showed optical properties in the ultraviolet wavelength region and had combined characteristics that were similar to that of ZnO (wurtzite structure) and Al 2 O 3 (corundum structure), which result from the similar local environments of the zinc and aluminum cations within the cubic spinel crystal structure. A mechanically induced optical absorption (optomechanical effect) in the ultraviolet wavelength region was also observed in ZnAl 2 O 4 . The ZnGa 2 O 4 powder followed a similar behavior, with the exception that the optomechanical effect did not occur in the gallate. The ZnAlGaO 4 showed optical spectra that were intermediate to that of the endpoint compositions.