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- W2012292961 abstract "The temperature dependences of the second moments of the proton magnetic resonance absorption spectra and spin-lattice relaxation times are measured in (NH4)2HAsO4 and (NH4)2HPO4. Characteristic T1 minima and proton line width transitions are found demonstrating the existence of two chemically different NH4 groups in the unit cell. The anomalous increase in the As75 NQR frequency with increasing temperature in (NH4)2HAsO4 is explained as a result of thermally induced “acid” proton fluctuations in the HAsO4 groups. In (NH4)2HAsO4 and (NH4)2HPO4 werden die Temperaturabhängigkeiten der zweiten Momente der magnetischen Protonenresonanzabsorptionsspektren und Spin—Gitter-Relaxationszeiten gemessen. Charakteristische T1-Minima und Übergänge der Protonenlinienbreiten werden gefunden und zeigen die Existenz von zwei chemisch verschiedenen NH4-Gruppen in der Einheitszelle an. Der anomale Anstieg in der As75-NQR-Frequenz mit steigender Temperatur in (NH4)2HAsO4 wird als Ergebnis thermisch induzierter „azider”︁ Protonenfluktuationen in den HAsO4-Gruppen interpretiert." @default.
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- W2012292961 date "1977-07-16" @default.
- W2012292961 modified "2023-10-17" @default.
- W2012292961 title "Proton magnetic resonance study of molecular motion in (NH4)2HAsO4 and (NH4)2HPO4" @default.
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- W2012292961 doi "https://doi.org/10.1002/pssa.2210420135" @default.
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