Phase-change sintering of BaCl^sub 2^ transparent ceramics

We report on the compaction of anhydrous BaCl2 powders under severe plastic deformation and the conversion of their native orthorhombic cotunnite crystalline structure into a fine-grained cubic fluorite structure. This conversion, supported by x-ray diffraction and transmission electron microscopy d...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-05, Vol.705, p.517
Main Authors: Shoulders, W Taylor, Gaume, Romain M
Format: Article
Language:English
Subjects:
Ceramic powders
Ceramics
Chemical compounds
Conversion
Diffraction
Fluorite
Phase transitions
Plastic deformation
Sintering
Temperature
Transition temperature
Transmission electron microscopy
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Summary:We report on the compaction of anhydrous BaCl2 powders under severe plastic deformation and the conversion of their native orthorhombic cotunnite crystalline structure into a fine-grained cubic fluorite structure. This conversion, supported by x-ray diffraction and transmission electron microscopy data, and which enables the production of highly dense ceramics of BaCl2, occurs 500 °C below the known phase transition temperature of 925 °C for this material at 1 atm. We discuss this phase change in the context of a stress-induced polymorphic transformation and its implication on the fabrication of transparent ceramics for scintillator applications.
ISSN:0925-8388
1873-4669