Chemical diffusion of water in the double perovskites Ba4Ca2Nb2O11 and Sr6Ta2O11
作者： I ANIMITSA , A NEIMAN , N KOCHETOVA , D KORONA , A SHARAFUTDINOV
DOI: 10.1016/J.SSI.2006.07.005
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摘要: The mechanism and kinetics of water incorporation in the double perovskites Ва4Ca2Nb2O11 Sr6Ta2O11 has been investigated (T = 300÷500 °C aH2O = 1 · 10− 3÷2.2 · 10− 2). formation hydration products Ba4Ca2Nb2O11·xH2O Sr6Ta2O11·xH2O (0.2 < x < 0.50) was limited by diffusion H2O. It found that concentration dependences D˜H2O are same for both samples: small increasing with x. temperature chemical coefficients compositions Ba4Ca2Nb2O11·0.35H2O Sr6Ta2O11·0.35H2O could be described close activation energies Ea = 0.38 ± 0.03 eV Ea = 0.49 ± 0.03 eV, respectively. nearly one order magnitude smaller tantalate Sr6Ta2O11. This result correlates lower oxygen proton conductivities as consequence mobilities.
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J. Bruce Wagner, Diffusion in Oxide Semiconductors Springer, Boston, MA. pp. 543- 600 ,(1973) , 10.1007/978-1-4615-8636-4_8
Atomic diffusion in semiconductors Plenum Press. ,(1973) , 10.1007/978-1-4615-8636-4
John Crank, The mathematics of diffusion ,(1956)
Irina Animitsa, Truls Norby, Stefan Marion, Ronny Glöckner, Arkady Neiman, Incorporation of water in strontium tantalates with perovskite-related structure Solid State Ionics. ,vol. 145, pp. 357- 364 ,(2001) , 10.1016/S0167-2738(01)00931-6
AS Nowick, KC Liang, None, Effect of non-stoichiometry on the protonic and oxygen-ionic conductivity of Sr2(ScNb)O6: a complex perovskite Solid State Ionics. ,vol. 129, pp. 201- 207 ,(2000) , 10.1016/S0167-2738(99)00326-4
Yu.M Baikov, The chemical state and the mobility of hydrogen in oxide–hydroxide solids Solid State Ionics. ,vol. 97, pp. 471- 476 ,(1997) , 10.1016/S0167-2738(97)00059-3
A.S Nowick, Yang Du, K.C Liang, Some factors that determine proton conductivity in nonstoichiometric complex perovskites Solid State Ionics. ,vol. 125, pp. 303- 311 ,(1999) , 10.1016/S0167-2738(99)00189-7
J. H. SHARP, G. W. BRINDLEY, B. N. NARAHARI ACHAR, Numerical Data for Some Commonly Used Solid State Reaction Equations Journal of the American Ceramic Society. ,vol. 49, pp. 379- 382 ,(1966) , 10.1111/J.1151-2916.1966.TB13289.X
I Animitsa, A Nieman, S Titova, N Kochetova, E Isaeva, A Sharafutdinov, N Timofeeva, Ph Colomban, Phase relations during water incorporation in the oxygen and proton conductor Sr6Ta2O11 Solid State Ionics. ,vol. 156, pp. 95- 102 ,(2003) , 10.1016/S0167-2738(02)00605-7
A HONDERS, J DERKINDEREN, A VANHEEREN, J DEWIT, G BROERS, Bounded diffusion in solid solution electrode powder compacts. Part II. The simultaneous measurement of the chemical diffusion coefficient and the thermodynamic factor in LixTiS2 and LixCoO2 Solid State Ionics. ,vol. 15, pp. 265- 276 ,(1985) , 10.1016/0167-2738(85)90129-8