Raman and infrared studies of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">CN</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>stretching-mode anharmonicity and its relation to phase transitions in pure alkali cyanides

Durand, Dominique; Lc, Scavarda do Carmo; Lüty, Fritz

doi:10.1103/physrevb.39.6096

Cited by 20 publications

(17 citation statements)

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“…The dichroic absorption results show that most OH À ions in the halogen-ion planes are arranged with their electric-dipole axes parallel to the crystal c-axis. Because the dipole moment of the OH À ion [10] is 8 to 18 times larger than that of the CN À ion [11], it would be energetically favorable for the OH À electric dipoles to be aligned parallel to the direction of the c-axis.…”

Section: Article In Pressmentioning

confidence: 99%

Dichroic infrared absorption of dipole centers in cadmium halide crystals

Terakami

Nakagawa

Fukui³

et al. 2004

Journal of Luminescence

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Dichroic infrared (IR) absorption measurements on CN‾ or OH‾ centers in cadmium halide crystals were carried out at 6 K with a high spectral resolution of 0.025 cm−1 at 2000 cm−1, by using a FT-IR spectrometer. Several sharp absorption lines with widths less than 0.1 cm−1 are observed in the energy region of the stretching vibration, i.e. 2000–2250 cm−1 for CN‾ and 2500–4500 cm−1 for OH‾. These lines are classified into three groups attributed to: (1) an isolated center simply substituted for a halogen ion, (2) an interstitial center located between the cadmium and halogen ion sheets and (3) a coupled center with an anion vacancy. A doublet structure is observed in CdI2 which comes from different halogen-ion sites in the 4H-polytype crystal. The isolated CN‾ centers in CdCl2 and CdBr2 align toward Cd2+ ions, away from the direction of the c-axis. Almost all of the coupled center with a vacancy lies in a halogen-ion plane. The doublet structure of the coupled center in CdCl2 and CdBr2 is connected to the tunneling splitting of a vibrational level

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Section: Article In Pressmentioning

confidence: 99%

Dichroic infrared absorption of dipole centers in cadmium halide crystals

Terakami

Nakagawa

Fukui³

et al. 2004

Journal of Luminescence

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“…Von vielen ionisch aufgebauten Cyaniden, dar unter insbesondere von den Alkalimetallcyaniden MCN (M = Na, K, Rb, Cs), ist bekannt, daß die Cyanidionen in den Hochtemperaturmodifikationen fehlgeordnet sind [1,2]. Zur Erklärung wur den sowohl Orientierungsfehlordnung in allen drei Raumrichtungen als auch eine Rotation der Cya nidionen auf ihren Gitterplätzen herangezogen [3].…”

Section: Introductionunclassified

“…Beim Unterschrei ten einer Grenztemperatur reduziert sich die Fehl ordnung. Die Cyanidionen liegen parallel zuein ander vor, aber die Richtung der Anordnung von Kohlenstoff-und Stickstoffatomen bleibt statistisch ungeordnet [1,3]. Natrium-und Kaliumcyanid zei gen bei weiterer Abkühlung einen zusätzlichen Phasenübergang.…”

Section: Introductionunclassified

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Kristallstruktur und thermische Phasenumwandlung von Tetramethylammoniumcyanid, (CH₃)₄N⁺CN^- / Crystal Structure and Thermal Phase Transition of Tetramethylammonium Cyanide, (CH₃)₄N⁺CN^-

Komath

Blecher

1999

Zeitschrift Für Naturforschung B

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“…The experimental value of dL/dz (2.4 D/9) is available in the literature, 41 and differs appreciably from theoretically predicted values, which are higher. 42 From these quantities the potential dependencies of the band frequencies (dvc.N/dE) were estimated to be 8cm' 1 V " 1 and 15cm' V " 1 for linear and bridged CN' , respectively.…”

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confidence: 98%

An Infrared Spectroelectrochemical Study of Cyanide Adsorption on Palladium Surfaces

Ashley¹,

Weinert²,

Samant³

et al. 1987

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Raman and infrared studies of theCN−stretching-mode anharmonicity and its relation to phase transitions in pure alkali cyanides

Cited by 20 publications

References 33 publications

Dichroic infrared absorption of dipole centers in cadmium halide crystals

Dichroic infrared absorption of dipole centers in cadmium halide crystals

Kristallstruktur und thermische Phasenumwandlung von Tetramethylammoniumcyanid, (CH₃)₄N⁺CN^- / Crystal Structure and Thermal Phase Transition of Tetramethylammonium Cyanide, (CH₃)₄N⁺CN^-

An Infrared Spectroelectrochemical Study of Cyanide Adsorption on Palladium Surfaces

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Raman and infrared studies of theCN−stretching-mode anharmonicity and its relation to phase transitions in pure alkali cyanides

Cited by 20 publications

References 33 publications

Dichroic infrared absorption of dipole centers in cadmium halide crystals

Dichroic infrared absorption of dipole centers in cadmium halide crystals

Kristallstruktur und thermische Phasenumwandlung von Tetramethylammoniumcyanid, (CH3)4N+CN- / Crystal Structure and Thermal Phase Transition of Tetramethylammonium Cyanide, (CH3)4N+CN-

An Infrared Spectroelectrochemical Study of Cyanide Adsorption on Palladium Surfaces

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Kristallstruktur und thermische Phasenumwandlung von Tetramethylammoniumcyanid, (CH₃)₄N⁺CN^- / Crystal Structure and Thermal Phase Transition of Tetramethylammonium Cyanide, (CH₃)₄N⁺CN^-