High-temperature phase transition of Tm2Ti2O7

被引：0
作者：
A. V. Shlyakhtina
A. V. Knot’ko
L. L. Larina
S. A. Borichev
L. G. Shcherbakova
机构：
[1] Russian Academy of Sciences,Semenov Institute of Chemical Physics
[2] Moscow State University,Emanuel Institute of Biochemical Physics
[3] Russian Academy of Sciences,undefined
[4] Mendeleev University of Chemical Technology,undefined
来源：
Inorganic Materials | 2004年 / 40卷
关键词：
Grain Size; Phase Transition; Heat Treatment; Inorganic Chemistry; Ionic Conductivity;
D O I：
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学科分类号：
摘要：
The high-temperature (>1600°C) order—disorder phase transition of Tm2Ti2O7 is shown to be irreversible. The 740°C ionic conductivity of nanocrystalline Tm2Ti2O7 ceramics synthesized at 1670°C is 2 × 10-3 S/cm and remains unchanged upon heat treatment in air at 860°C for 240 h. The conductivity of the high-temperature (disordered pyrochlore) phase of Tm2Ti2O7 is independent of grain size in the range 20–30 nm.
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页码：1312 / 1316
页数：4
相关论文
共 22 条
[1]  
Goodenough J.B.(2000)Oxide-Ion Conductors by Design Nature 404 821-823
[2]  
Boivin J.C.(1998)Recent Material Developments in Fast Oxide Ion Conductors Chem. Mater. 10 2870-2880
[3]  
Mairesse G.(1978)Electrical Properties of the α, β, γ and δ Phases of Bismuth Sesquioxide J. Solid Sate Chem. 26 265-274
[4]  
Harwing H.A.(1997)Semiconduction and Mixed Ionic-Electronic Conduction in Nonstoichiometric Oxides: Impact and Control Solid State Ionics 94 63-74
[5]  
Gerard A.G.(2003)Compatibility of Gd Solid State Ionics 158 79-90
[6]  
Tuller H.L.(2004)Ti J. Solid State Electrochem. 8 661-667
[7]  
Mori M.(2004)O Neorg. Mater. 40 67-74
[8]  
Tompsett G.M.(2003) Pyrochlores (1.72 < x < 2.0) as Electrolytes in High-Temperature Solid Oxide Fuel Cells Elektrokhimiya 49 520-525
[9]  
Sammes N.M.(2003)Study of the Fluorite-Pyrochlore-Pyrochlore Phase Transitions in Ln Ferroelectrics 294 175-190
[10]  
Shlyakhtina A.V.(undefined)Ti undefined undefined undefined-undefined
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