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- W2157308504 abstract "Small crystals of CaZnF4 with scheelite-type structure, doped with about 1% Mn are obtained from the melt by the Bridgman method with subsequent annealing at 725 °C, 50 K below a reversible phase transformation detected by DTA. Mn2+ exclusively occupies Zn sites as evident from the size of the hyperfine splitting constant. The intrinsic zero field splitting parameter of second order obtained from superposition analysis is in the same range as that for [MnF6]4− units. The luminescence spectra do not serve as a critical test for distinction between four- and eightfold coordination. Kleine Kristalle von CaZnF4 mit Scheelit-Struktur, dotiert mit etwa 1% Mn, wurden aus der Schmelze nach der Bridgman-Methode mit nachfolgender Temperung bei 725 °C, 50 K unterhalb einer reversiblen, durch DTA nachgewiesenen Phasenumwandlung, erhalten. Mn2+ besetzt ausschließlich Zn-Gitterplätze, wie die Größe der Hyperfeinaufspaltungskonstanten zeigt. Der durch Superpositionsanalyse erhaltene intrinsische Nullfeldaufspaltungsparameter zweiter Ordnung hat etwa den gleichen Wert wie für Mn2+ in sechsfacher Koordination durch Fluor. Die Lumineszenzspektren können nicht zur Unterscheidung von vier- und achtfacher Koordination eingesetzt werden." @default.
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- W2157308504 date "1983-05-01" @default.
- W2157308504 modified "2023-10-16" @default.
- W2157308504 title "EPR and luminescence of Mn2+ in distorted tetrahedral symmetry in CaZnF4 crystals" @default.
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- W2157308504 doi "https://doi.org/10.1002/pssb.2221170129" @default.
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