EPR measurements on yttria-doped tetragonal zirconia polycrystals (Y-TZP) were performed in order to study the modifications of the structure of the material following hydrothermal treatments. By X-ray irradiation of the samples, the structural defects near the oxygen vacancies were magnetically activated by electron trapping. Y2O3 aggregates were identified by EPR signals of defects of F+ type, coordinated with yttrium ions, and defects such as Y2+ (4d1) in four-fold coordination, randomly tetragonally distorted. The analysis of these defect sites, used as local probes, supports the existence of structural modification of the material and the formation of α-Y(OH)3 clusters. © 1993 Chapman & Hall.
Azzoni, C., Paleari, A., Scardina, F., Krajewski, A., Ravaglioli, A., Meschke, F. (1993). EPR structural study on hydrothermally aged yttria-doped tetragonal zirconia polycrystals. JOURNAL OF MATERIALS SCIENCE, 28(14), 3951-3956 [10.1007/BF00353204].
EPR structural study on hydrothermally aged yttria-doped tetragonal zirconia polycrystals
PALEARI, ALBERTO MARIA FELICE;
1993
Abstract
EPR measurements on yttria-doped tetragonal zirconia polycrystals (Y-TZP) were performed in order to study the modifications of the structure of the material following hydrothermal treatments. By X-ray irradiation of the samples, the structural defects near the oxygen vacancies were magnetically activated by electron trapping. Y2O3 aggregates were identified by EPR signals of defects of F+ type, coordinated with yttrium ions, and defects such as Y2+ (4d1) in four-fold coordination, randomly tetragonally distorted. The analysis of these defect sites, used as local probes, supports the existence of structural modification of the material and the formation of α-Y(OH)3 clusters. © 1993 Chapman & Hall.
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