کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1297313 1498373 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanochemical synthesis and order–disorder phase transition in fluoride ion conductor RbPbF3
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Mechanochemical synthesis and order–disorder phase transition in fluoride ion conductor RbPbF3
چکیده انگلیسی

Fluoride ion conductor RbPbF3 was synthesized by means of mechanochemical method. Three distinct phases including two new structures were confirmed, Im-3m structure just after synthesis, Pnma structure after annealing and Pm-3m structure at high temperature. The structural differences among them were attributed to not only dynamic properties of the fluoride ions but also to the cation arrangements in their structures. In the case of Im-3m structure a body-centered cationic sub-lattice is formed by random distribution of Rb+ and Pb2+. Phase transition from Im-3m to Pnma takes place at 340 K–400 K associated with an exothermic process. A superionic phase transition at 490 K from Pnma to Pm-3m structure demonstrated a order–disorder character, at which the conductivity jumped ca 2 orders and reached 3 ⁎ 10− 2 S cm− 1 at 500 K. Temperature dependences of 19F NMR spectra supported the high fluoride ion conductivities at Im-3m and Pm-3m phases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 179, Issues 17–18, July 2008, Pages 605–610
نویسندگان
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