Lattice Dynamics of Silver Chloride

Vijayaraghavan, P.R.; Nicklow, R. M.; Smith, Harry; Wilkinson, M. K.

doi:10.1103/physrevb.1.4819

Cited by 86 publications

(18 citation statements)

References 20 publications

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“…The solid lines and circles correspond to the theoretical and experimental results, respectively. The present calculations for AgCl and AgBr are in good agreement with the experimental results [5,6]. These results have already been confirmed by Kleppmann and Weber [7].…”

Section: Phonon Dispersion Relations and Elastic Constantssupporting

confidence: 92%

“…The observed phonon dispersion curves of rock-salt silver halides are known to show some unusual behaviors different from those of alkali halides [3]. For instance, the transverse optical (TO) phonon branch is low at the L point of the Brillouin zone and crosses the longitudinal acoustic (LA) phonon branch [3][4][5][6]. It is considered that the d electrons of Ag ions give rise to these peculiar phonon dispersion relations of silver halides.…”

Section: Introductionmentioning

confidence: 94%

“…Solid lines denote the theoretical values based on the QD shell model. Solid circles are the experimental values[5].…”

mentioning

confidence: 99%

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Influence of quadrupolar deformability on phonon dispersion in silver and copper halides

2004

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Section: Phonon Dispersion Relations and Elastic Constantssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 94%

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Influence of quadrupolar deformability on phonon dispersion in silver and copper halides

2004

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“…Nusslein and Schroder [19] introduced the deformable shell model and got a slightly better agreement with observed data than with the simple shell model. However, all these models were not very successful for the description of the lattice dynamics of AgCl [20], at least the values of the parameters had no obvious physical significance. Fischer et al [5] developed therefore a model with new electronic degrees of freedom of quadrupolar (Fi2) and rotational symmetry character to consider the deformability of the d shell of the Ag+ ion and its covalent coupling to the neighbours.…”

Section: Modelsmentioning

confidence: 94%

Crystal dynamics of silver bromide at 80 and 295 K

Bührer

1975

Physica Status Solidi (b)

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The dispersion relation for the normal modes of vibration in AgBr have been determined a t 80 and 295 K along symmetry directions. The neutron inelastic scattering experiments have been performed on a triple axis spectrometer a t the "Diorit" reactor. The phonon frequencies show a strong temperature dependence. The dispersion curves can be well fitted by an eleven-parameter model with deformable electronic shells of the silver ions.In Silberbromid wurden die Frequenzen der Normalschwingungen bei 80 und 295 K entlang der Symmetrierichtungen durch unelastische Neutronenstreuung bestimmt. Die Experimente wurden mit einem Dreiachsen-Spektrometer am Ileaktor ,,Diorit" durchgefiihrt. Die Dispersionskurven zeigen eine sehr starke Temperaturabhangigkeit. Die gemessenen E'requenzen konnen durch ein Elf-Parameter-Model1 mit deformierbaren Elektronenschalen der Silber-Ionen gut beschrieben werden.

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“…For the Indium III-Vcompounds InSb, InAs, InP, where the nuclear relaxation times have been measured over a wide range of temperatures, a considerable improvement of the theoretical fit was achieved by using the experimentally determined phonon spectrum of grey tin [27], I. As to the silver halides the phonon spectrum of AgC1 has been computed from the phonon dispersion curves as measured by X-ray [28] and by neutron scattering [29]. Another approach was taken by Sch~ifer and Ludwig [30,31]: They derived an analytic expression for the phonon spectrum of AgC1 from the macroscopic interionic force constants, and with this spectrum the thermodynamic functions could be calculated in almost perfect agreement with the experimental data.…”

Section: Temperature Dependence Of the Spin-lattice Relaxation Time Tmentioning

confidence: 99%

Relaxation and deorientation of110Ag(T 1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides

et al. 1973

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Polarized 11~ nuclei are produced in the silver halides by capture of polarized neutrons at temperatures below 30 K and magnetic field strengths up to 6 kOe. The depolarization process is studied by observation of the 11 decay asymmetry as a function of magnetic field, temperature and of the radio frequency field strength in NMR signals. The depolarization is caused by a field dependent deorientation process and by temperature dependent spin-lattice relaxation. The deorientation is due to a succession of coupling steps of the nuclear spin with electromagnetic fields of defects generated as a consequence of the capture process, and the field dependence of the polarization can be understood as a decoupling curve. The temperature dependence of the spin-lattice relaxation is in accordance with the theory of quadrupolar relaxation above 18 K if an empirical phonon spectrum is used for the calculation. At lower temperatures the experimental relaxation rate is anomalously high, which may be due to resonance modes connected with recoil lattice defects.

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Lattice Dynamics of Silver Chloride

Cited by 86 publications

References 20 publications

Influence of quadrupolar deformability on phonon dispersion in silver and copper halides

Influence of quadrupolar deformability on phonon dispersion in silver and copper halides

Crystal dynamics of silver bromide at 80 and 295 K

Relaxation and deorientation of110Ag(T 1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides

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