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- W1985052011 abstract "The far-infrared reflectivity of (CH3NH3)3MnCl4(=MAMC) and of (CH3NH3)2FeCl4(=MAFC) single crystals was studied at several temperatures. By means of a Kramers-Kronig analysis, the frequencies of the long-wavelength infrared-active phonons were determined. Because of the considerable gap (300-900 cm-1) between the external and the internal modes of the organic ions these can be treated as rigid bodies at far-infrared frequencies. In addition, the authors present the results of a structure analysis of MAMC above and below the continuous phase transition at 394K which turns out to be of the order-disorder type. In the high-temperature tetragonal modification, three strong and two weak IR-active modes are observed for E perpendicular to c." @default.
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- W1985052011 date "1975-12-07" @default.
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- W1985052011 title "Lattice dynamics in perovskite-type layer structures. FIR studies of (CH<sub>3</sub>NH<sub>3</sub>)<sub>2</sub>MnCl<sub>4</sub>and (CH<sub>3</sub>NH<sub>3</sub>)<sub>2</sub>FeCl<sub>4</sub>" @default.
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- W1985052011 doi "https://doi.org/10.1088/0022-3719/8/23/023" @default.
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