AEM quantification of phase compositions in SIALON-YAG ceramics
Conference
·
OSTI ID:6305441
Silicon nitride ceramics based on SIALON-YAG compositions have been shown to crystallize garnet (nominally Y3Al5O12) from a glassy matrix phase upon heat treatment of specimens hot-pressed with Y2O3 as a sintering aid (Lewis et al., 1980; Hohnke et al., 1981). It is of interest to accurately determine phase compositions in such materials in order to fully understand crystallization behavior and the development of microstructure. Upon initial inspection, these ceramics pose particular difficulties for quantitative AEM microanalysis. These difficulties are due in part to the extremely fine grain and intergrain dimensions, and to the potential for spectral artefacts to be generated by secondary fluorescence effects. The latter problem has been demonstrated in Ni-Ti analyses, for example (Angelini and Bentley, 1984), and was expected to be critical in the characterization of the garnet phase since both BSE's and yttrium x-rays can excite Si which is present in large concentration in bulk regions of ion-milled samples. The present report describes details of the quantification scheme developed for analysis of these specimens, and the experimental tests used to accurately characterize secondary fluorescence effects. The analysis techniques are applied to quantification of phases in hot-pressed and annealed specimens containing nominally 5 eq.% Al in the US -SIALON phase and 20 w/o garnet in annealed specimens.
- Research Organization:
- Michigan Univ., Ann Arbor (USA)
- DOE Contract Number:
- FG02-84ER45069
- OSTI ID:
- 6305441
- Report Number(s):
- CONF-8509168-4; ON: DE86003866
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
ELECTRON MICROSCOPY
MICROANALYSIS
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
ELECTRON MICROSCOPY
MICROANALYSIS
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES