¹²⁷I NQR and Crystal Structure Studies of [N(CH₃)₄]₂CdI₄

verfasst von

Hideta Ishihara, Keizo Horiuchi, Thorsten M. Gesing, Shi Qi Dou, J. Christian Buhl, Hiromitsu Terao

Abstract

The temperature dependence of ¹²⁷1 NQR and DSC as well as the crystal structure at room temperature of the title compound were determined. This compound shows a first-order phase transition of an order-disorder type at 245 K. Eight¹²⁷I(v_:1 NQR lines of 79.57, 81.86, 82.56, 83.36, 84.68, 87.72, 88.34, and 88.86 MHz, and corresponding eight 127I(i/2: m = ±| ±) NQR lines were observed at liquid nitrogen temperature. Three ^l27I(v₁) NQR lines with an intensity ratio of 1:1:2 in the order of decreasing frequency were observed just above the transition point and two NQR lines except for the middle-frequency line disappeared around room temperature. This temperature behavior of NQR lines is very similar to that observed in [N(CH₃)₄]₂Hgl₄. Another first-order phase transition takes place at 527 K. The structure of the room-temperature phase was redetermined: orthorhombic, Pnma, Z = 4, a = 1342.8(3), b = 975.7(2), c = 1696.5(3) pm. The NQR result of three lines with an intensity ratio of 1:1:2 is in agreement with this structure. The thermal displacement parameters of atoms in both cations and anions are large.

Organisationseinheit(en)

Institut für Mineralogie

Externe Organisation(en)

Saga University
University of the Ryukyus
Tokushima University

Typ

Artikel

Journal

Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences

Band

55

Seiten

225-229

Anzahl der Seiten

5

ISSN

0932-0784

Publikationsdatum

01.02.2000

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Mathematische Physik, Physik und Astronomie (insg.), Physikalische und Theoretische Chemie

Elektronische Version(en)

https://doi.org/10.1515/zna-2000-1-240 (Zugang: Offen)
https://doi.org/10.15488/2371 (Zugang: Offen)