Local environment of Barium, Cerium and Yttrium in BaCe1-xYxO3-δ ceramic protonic conductors

被引:48
作者
Giannici, F.
Longo, A.
Deganello, F.
Balerna, A.
Arico, A. S.
Martorana, A.
机构
[1] Univ Palermo, Dipartimento Chim Inorgan & Analit Stanislao Cann, I-90128 Palermo, Italy
[2] CNR, ISMN, I-90146 Palermo, Italy
[3] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[4] CNR, ITAE, I-98126 Messina, Italy
关键词
barium cerate; Y-doping; protonic conductor; perovskite; EXAFS;
D O I
10.1016/j.ssi.2007.01.015
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Y-doped barium cerate protonic conductors with composition BaCe1-xYxO3-delta (x=0.02, 0.1, 0.2, 0.3) have been synthesized by sol-gel route, giving by X-ray diffraction tests a homogeneous crystalline phase. A commercial sample BaCe0.8Y0.2O3-delta produced by combustion spray pyrolysis was also provided for comparison aim. The local structure around the cations was studied by X-ray absorption spectroscopy at the K-edges of Ba, Ce and Y. It is demonstrated that the insertion of yttrium in the site of cerium produces a remarkable local distortion of the dopant first-shell octahedral environment that affects also the next coordination shells by a static disorder increasing with dopant amount. For a dopant concentration estimated as x > 0. 17, a poorly crystallized yttrium oxide phase that cannot be detected by X-ray diffraction is segregated. The static disorder around Y noticeably increases in the protonated samples and can be related to a preferential location of protons near the dopant. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:587 / 591
页数:5
相关论文
共 28 条
[1]   Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure [J].
Ankudinov, AL ;
Ravel, B ;
Rehr, JJ ;
Conradson, SD .
PHYSICAL REVIEW B, 1998, 58 (12) :7565-7576
[2]   EXAFS study of SrCeO3 doped with Yb [J].
Arita, Y ;
Yamasaki, S ;
Matsui, T ;
Harami, T ;
Kobayashi, K .
SOLID STATE IONICS, 1999, 121 (1-4) :225-228
[3]   Cation dopant sites in the CaZrO3 proton conductor:: a combined EXAFS and computer simulation study [J].
Davies, RA ;
Islam, MS ;
Chadwick, AV ;
Rush, GE .
SOLID STATE IONICS, 2000, 130 (1-2) :115-122
[4]   Protons and other defects in BaCeO3:: a computational study [J].
Glöckner, R ;
Islam, MS ;
Norby, T .
SOLID STATE IONICS, 1999, 122 (1-4) :145-156
[5]   QUASI-ELASTIC NEUTRON-SCATTERING STUDY OF PROTON DIFFUSION IN SRCE0.95YB0.05H0.02O2.985 [J].
HEMPELMANN, R ;
KARMONIK, C ;
MATZKE, T ;
CAPPADONIA, M ;
STIMMING, U ;
SPRINGER, T ;
ADAMS, MA .
SOLID STATE IONICS, 1995, 77 :152-156
[6]   Defects and protons in the CaZrO3 perovskite and Ba2In2O5 brownmillerite:: computer modelling and EXAFS studies [J].
Islam, MS ;
Davies, RA ;
Fisher, CAJ ;
Chadwick, A .
SOLID STATE IONICS, 2001, 145 (1-4) :333-338
[7]   Proton migration and defect interactions in the CaZrO3 orthorhombic perovskite:: A quantum mechanical study [J].
Islam, MS ;
Davies, RA ;
Gales, JD .
CHEMISTRY OF MATERIALS, 2001, 13 (06) :2049-2055
[8]   Prospect of hydrogen technology using proton-conducting ceramics [J].
Iwahara, H ;
Asakura, Y ;
Katahira, K ;
Tanaka, M .
SOLID STATE IONICS, 2004, 168 (3-4) :299-310
[9]   Local structure around Yb in SrZr1-xYbxO3 [J].
Kamishima, O ;
Ohta, K ;
Chiba, Y ;
Hattori, T .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2001, 13 (11) :2455-2466
[10]   A HIGH-RESOLUTION NEUTRON POWDER DIFFRACTION STUDY OF NEODYMIUM DOPING IN BARIUM CERATE [J].
KNIGHT, KS ;
BONANOS, N .
SOLID STATE IONICS, 1995, 77 :189-194