Synthesis and high-temperature electrical conductivity of Ln2Ti2O7 and LnYTi2O7 (Ln = Dy, Ho)

被引：0

作者：

Shlyakhtina, A. V. ^{[1
]}

Savyin, S. N. ^{[3
]}

Levchenko, A. V. ^{[2
]}

Kolbanev, I. V. ^{[1
]}

Karyagina, O. K. ^{[4
]}

Shcherbakova, L. G. ^{[1
]}

机构：

[1] Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 119991, Russia

[2] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Russia

[3] Moscow MV Lomonosov State Univ, Moscow 119899, Russia

[4] Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119991, Russia

来源：

INORGANIC MATERIALS | 2008年 / 44卷 / 03期

关键词：

D O I：

10.1134/S0020168508030163

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ho2Ti2O7 and LnYTi(2)O(7) (Ln = Dy, Ho) pyrochlores have been synthesized using hydroxide coprecipitation, mechanical activation, and firing at 1600 degrees C. The bulk and grain-boundary components of their conductivity have been determined for the first time by impedance spectroscopy. The 740 degrees C bulk conductivity of Ho2Ti2O7 is 4 x 10(-4) S/cm, and that of HoYTi2O7 is 1 x 10(-3) S/cm, with activation energies E-a = 1.01 and 1.17 eV, respectively, suggesting that these materials are new oxygen-ion conductors. The bulk conductivity of DyYTi2O7 (3 x 10(-4) S/cm at 740 degrees C, E-a = 1.09 eV) is almost one order of magnitude lower than that of HoYTi2O7 (1 x 10(-3) S/cm at 740 degrees C, E-a = 1.17 eV).

引用

页码：299 / 304

页数：6

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