کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9804209 | 1516480 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structure (at T = 163 K) and phase transitions of NH4HgI3·H2O
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
NH4HgI3·H2O crystallizes in the monoclinic system, space group Cc (No. 9), with: a = 10.9865(11) Ã
; b = 9.7683(10)Â Ã
; c = 8.6759(9)Â Ã
; β = 90.395(8)°; V = 931.07(16) Ã
3 and Z = 4 (T = 163 K). Refinement of single crystal X-ray data lead to R(F) = 0.0271. The structure consists of tetrahedra [HgI4] linked by common corners to infinite chains, running parallel to [0 0 1]. The ammonium groups and water molecules are located between the chains ensuring the stability of the structure by hydrogen bonding contacts: Nî¸Hâ¯I, Oî¸Hâ¯I and Nî¸Hâ¯O. Differential scanning calorimetry reveals three anomalies at 219, 345 and 375 K. The peak at 219 K, according to the single crystal X-ray diffraction, was attributed to an orientational disorder of ammonium groups. IR-spectroscopy shows that the NH4HgI3·H2O compound loses crystallization water gradually in the temperature range (350-540 K).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 386, Issues 1â2, 11 January 2005, Pages 107-114
Journal: Journal of Alloys and Compounds - Volume 386, Issues 1â2, 11 January 2005, Pages 107-114
نویسندگان
M. Loukil, A. Kabadou, I. Svoboda, A. Ben Salah, H. Fuess,