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H.C.G. Verhaar H. Donker G.J. Dirksen M.J.J. Lammers G. Blasse C.C. Torardi L.H. Brixner 《Journal of solid state chemistry》1985,60(1):20-28
The luminescence of undoped and rare-earth-doped LaNb3O9 is reported. The two modifications (α and β) show striking differences. Whereas undoped β-LaNb3O9 does not luminesce at all (down to 4.2 K), α-LaNb3O9 emits efficiently with a quenching temperature of 250 K. Energy transfer from niobate to rare-earth dopants is observed for the α, but not for the β modification. The rare-earth dopant emission consists of sharp lines for the α modification, but is considerably broadened for the β modification. The luminescence properties are discussed in terms of the crystal structure. In addition results for α-NbPO5 will be given. 相似文献
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B. J. Verhaar A. M. Schulte J. de Kam 《Zeitschrift für Physik A Hadrons and Nuclei》1976,276(3):261-264
The relation between the socalled Coriolis couplingI · j, operating in rotating nuclei, and the classical Coriolis force is discussed. The system forces acting in the cranking model for non-uniform rotation and in the rotator-particle model are examined. Differences with the molecular Coriolis coupling are indicated. 相似文献
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Isoperimetric inequalities are applied to a moving-boundaryproblem for doubly-connected domains. This problem occurs forexample in electrochemistry, in which case the domains in questionare the electrolyte of an electrolytic cell. The two electrodessurrounding the electrolyte are assumed to grow or dissolve,at different rates in general, by electrochemical reaction.We obtain optimal estimates showing, for example, that the leastchange in volume of each electrode always occurs in sphericalsymmetry. 相似文献
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G. Blasse M.J.J. Lammers H.C.G. Verhaar L.H. Brixner C.C. Torardi 《Journal of solid state chemistry》1985,60(2):258-261
The luminescence of La3NbO4Cl6 with trigonal bipyramidal NbO5?5 groups is reported. The Nb5+ coordination does not seem to influence the niobate emission. The luminescence and Raman spectrum of La3TaO4Cl6 are also reported. Finally, differences in luminescence of the M and M′ modifications of YTaO4 are discussed. 相似文献
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