کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10637057 | 993844 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structures, phase transitions and electrical properties of Ag5Te2âySeyCl (y=0-0.7)
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Herein we report the structural, thermal and physical properties of Ag5Te2âySeyCl (y=0-0.7). Polymorphic Ag5Te2Cl (y=0) is an ion conductor with two reversible phase transitions at 241 and 334 K. While the monoclinic room temperature β- and the low temperature γ-phase show conductivities below Ï=10â3Ωâ1cmâ1, the tetragonal high temperature α-phase is a promising conductor for electronic devices with conductivities up to 10â1Ωâ1cmâ1 in addition to high moisture and photo stability. The α-β-phase transition temperature of ion conducting Ag5Te2Cl can be lowered by partial substitution of tellurium by selenium. From differential thermal analysis (DTA) and differential scanning calorimetry (DSC) a linear decrease of the α-β-phase transition temperature with increasing compositional parameter y to a minimum transition temperature of 239 K was observed for Ag5Te1.3Se0.7Cl. Phases up to a maximum selenium content of y=0.7 were stabilized by preservation of the β- and α-Ag5Te2Cl structure types. Ag5Te2âySeyCl (y=0-0.9) phases were characterised by powder X-ray diffraction (XRD) at room temperature. The stabilization of the α-Ag5Te2Cl structure type in Ag5Te2âySeyCl around room temperature results in an increase of conductivity of more than 2 orders of magnitude compared to the ternary phase. Conductivity of up to Ï=5.1Ã10â2Ωâ1cmâ1 (314 K, α-Ag5Te1.6Se0.4Cl) was observed by impedance spectroscopy. In the range from room temperature down to 239 K any transition temperature can be chosen by simply varying the composition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 7, Issue 1, January 2005, Pages 79-88
Journal: Solid State Sciences - Volume 7, Issue 1, January 2005, Pages 79-88
نویسندگان
Tom Nilges, Cornelia Dreher, Anna Hezinger,