An XAS study of the defect structure of Ti-doped α-Cr2O3

被引：47
作者：
Blacklocks, Aran N.
Atkinson, Alan
Packer, Robert J.
Savin, Shelley L. P.
Chadwick, Alan V.
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England
[2] Univ Kent, Sch Phys Sci, Funct Mat Grp, Canterbury CT2 7NH, Kent, England
来源：
SOLID STATE IONICS | 2006年 / 177卷 / 33-34期
关键词：
chromium oxide; XAS; EXAFS; XANES; point defects; gas sensor;
D O I：
10.1016/j.ssi.2006.08.028
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：
The bulk defect structure in Cr2-xTixO3 (x = 0.05, 0.20 and 0.30) has been studied by X-ray absorption spectroscopy measurements at the Cr and Ti K-edges. The results show that the Ti is predominantly present in the IV oxidation state and resides on the normal Cr host lattice site. The dopant is charge compensated by Cr3+ vacancies and there is evidence for the formation of defect clusters; however, the detailed structure of these clusters could not be deduced. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：2939 / 2944
页数：6
相关论文
共 20 条
  • [1] LOCAL ORDER IN SOL-GEL DERIVED GLASSY TIO2
    ANTONIOLI, G
    BERSANI, D
    LOTTICI, PP
    MANZINI, I
    GNAPPI, G
    MONTENERO, A
    [J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1995, 97 (1-4) : 198 - 201
  • [2] Defect properties of Ti-doped Cr2O3
    Atkinson, Alan
    Levy, Mark R.
    Roche, Severine
    Rudkin, Robert A.
    [J]. SOLID STATE IONICS, 2006, 177 (19-25) : 1767 - 1770
  • [3] Tin-, titanium-, and magnesium-doped α-Cr2O3:: characterisation and rationalisation of the structures
    Ayub, I
    Berry, FJ
    Johnson, C
    Johnson, DA
    Moore, EA
    Ren, XL
    Widatallah, HM
    [J]. SOLID STATE COMMUNICATIONS, 2002, 123 (3-4) : 141 - 145
  • [4] BINSTED N, 1998, SERC DARESBURY PROGR
  • [5] ELECTRON-ENERGY LOSS AND X-RAY ABSORPTION-SPECTROSCOPY OF RUTILE AND ANATASE - A TEST OF STRUCTURAL SENSITIVITY
    BRYDSON, R
    SAUER, H
    ENGEL, W
    THOMAS, JM
    ZEITLER, E
    KOSUGI, N
    KURODA, H
    [J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 1989, 1 (04) : 797 - 812
  • [6] EXAFS STUDIES OF DOPANT SITES IN METAL-OXIDES
    CHADWICK, AV
    [J]. SOLID STATE IONICS, 1993, 63-5 : 721 - 727
  • [7] Ti K-edge XANES studies of Ti coordination and disorder in oxide compounds: Comparison between theory and experiment
    Farges, F
    Brown, GE
    Rehr, JJ
    [J]. PHYSICAL REVIEW B, 1997, 56 (04) : 1809 - 1819
  • [8] SELECTIVITY AND COMPOSITION DEPENDENCE OF RESPONSE OF GAS-SENSITIVE RESISTORS .2. HYDROGEN-SULFIDE RESPONSE OF CR-2-XTIXO3+Y
    HENSHAW, GS
    DAWSON, DH
    WILLIAMS, DE
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 1995, 5 (11) : 1791 - 1800
  • [9] Electrical conductivity of Cr2O3 doped with TiO2
    Holt, A
    Kofstad, P
    [J]. SOLID STATE IONICS, 1999, 117 (1-2) : 21 - 25
  • [10] Electrical conductivity and defect structure of Mg-doped Cr2O3
    Holt, A
    Kofstad, P
    [J]. SOLID STATE IONICS, 1997, 100 (3-4) : 201 - 209
12