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Crystal structure, dielectric properties and molecular motions in (i-C4H9NH3)3Bi2Br9

✍ Scribed by J. Jóźków; R. Jakubas; G. Bator; J. Zaleski; R. Decressain

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 332 KB
Volume: 61
Category: Article
ISSN: 0022-3697
DOI: 10.1016/s0022-3697(99)00386-8

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✦ Synopsis

The crystal structure of (i-C 4 H 9 NH 3 ) 3 Bi 2 Br 9 at room temperature has been determined and refined to R 0:036: The crystal is orthorhombic, space group Ama2. The structure is built up of the i-butylammonium cations and isolated Bi 2 Br 3Ϫ 9 anions. The complex dielectric permittivity along the a-axis has been measured between 500 Hz and 1000 MHz in the vicinity of two phase transitions at 252 and 263 K. The dielectric response close to 252 K is well described by the Debye equation. The activation energy of the reorientation of the i-butylammonium cations is found to be 0.68 eV. The temperature dependencies of the proton relaxation time T 1 and of the second moment of 1 H NMR has been studied between 120 and 390 K. The relaxation time T 1 reveals one minimum due to the motion of both NH 3 and CH 3 groups. Analysis of the relaxation data yields the activation energy barriers for the NH 3 and CH 3 groups motion of 0.113 and 0.037 eV, respectively. The NMR studies suggest that the 263 K phase transition is connected with the reorientation of the cations as a whole.

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