کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1490686 | 992330 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-temperature dehydration behavior and protonic conductivity of RbH2PO4 in humid atmosphere
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The high-temperature (HT) properties of RbH2PO4 have been investigated here by several methods. Two anomalies at Tp (â¼109 °C) and Tâ²p (â¼276 °C) in differential scanning calorimetry (DSC) measurement are due to structural transition from tetragonal (phase III) to monoclinic (phase II) and monoclinic to an unidentified phase I, respectively. The initial dehydration event in RbH2PO4 occurs at â¼250 °C, leading to the formation of dimer crust (Rb2H2P2O7) on the external surface of crystal particles which decelerates the further dehydration process. The conductivity measurement was performed under a highly humidified N2 condition PH2Oâ0.56atm to suppress its dehydration. It revealed two reversible superprotonic phase transition at Tp and Tâ²p. For the one at Tâ²p, the conductivity increases sharply by â¼2 orders of magnitude and the high-conductivity phase I was stable till melting. However, the other one at Tp shows a relatively small jump in conductivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 45, Issue 12, December 2010, Pages 1909-1915
Journal: Materials Research Bulletin - Volume 45, Issue 12, December 2010, Pages 1909-1915
نویسندگان
Zikun Li, Tongbor Tang,