ISSN:
1432-0630
Keywords:
PACS: 76; 78
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
2+ spectra in axial and cubic crystal fields. Cu2+ substitutes for Ti4+ and the excess charge can be compensated by La3+ on a nearest-neighbor site, thus creating axial symmetry. The centers of cubic symmetry are those where the charge is compensated in distant spheres. In contrast to pure PLZT, PLZT:Cu exhibits a new luminescence band peaking at 1.18 eV. This emission is ascribed to the 2T2(D)→2E(D) transition of Cu2+(3d9) which can be excited either in the resonant 1.87 eV band or via charge-transfer excitation bands at 2.40, 2.57, and 3.03 eV. The absorption band at 1.45 eV is assumed to be that of Cu+ ions. Annealing in hydrogen and in oxygen atmospheres caused decrease and restoration, respectively, of the ESR and luminescence intensities as a consequence of Cu2+ conversion into Cu1+ and vice versa.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003390050712
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