Dielectric Susceptibility of Ion Impurity Systems at Low Temperatures

Baur, M. E.; Salzman, W. R.

doi:10.1103/physrevlett.16.701

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Low-temperature Anharmonicity In Fecl 2 and Other Materials1

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1966

1973

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Cited by 16 publications

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“…For example, lithium impurities in potassium chloride and potassium bromide show a multiminimum potential. [35][36][37][38] In these cases the minima in the potential are large enough so that upon cooling to low temperatures these ions will actually settle into one of the off-center minima. Another example of this type of behavior is the growing class of displacive ferroelectric materials.…”

Section: Low-temperature Anharmonicity In Fecl 2 and Other Materialsmentioning

confidence: 99%

Low-Temperature Anharmonicity in FeCl2

Johnson

Dash

1968

Phys. Rev.

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Mossbauer spectra of Fe 57 in thin anhydrous ferrous chloride powdered absorbers have been investigated at several temperatures between 300 and 10°K. The quadrupole splitting, velocity shift, and Mossbauer fraction have been determined. The Mossbauer fraction of FeCl2 shows an anomalously weak temperature dependence which cannot be explained by any harmonic model for the interatomic forces or by the usual hightemperature anharmonicity. This anomalous behavior implies a low-temperature anharmonicity which is qualitatively explained in terms of the relative sizes of the ions involved. The interpretation is consistent with the finding of essentially harmonic behavior for FeF2. The results of our reexamination of other Mossbauer / studies are also consistent with these size arguments.

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Section: Low-temperature Anharmonicity In Fecl 2 and Other Materialsmentioning

confidence: 99%