Using 18O/16O exchange to probe an equilibrium space-charge layer at the surface of a crystalline oxide:: method and application

被引：88

作者：

De Souza, Roger A. ^{[1
]}

Martin, Manfred ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Phys Chem, D-52056 Aachen, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2008年 / 10卷 / 17期

关键词：

D O I：

10.1039/b719618k

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 use of an O-18/O-16 exchange experiment as a means for probing surface space-charge layers in oxides is examined theoretically and experimentally. On the basis of a theoretical treatment, isotope penetration profiles are calculated for O-18/O-16 exchange across a gas-solid interface and subsequent diffusion of the labelled isotope through an equilibrium space-charge layer depleted of mobile oxygen vacancies and into a homogeneous bulk phase. Profiles calculated for a range of conditions all have a characteristic shape: a sharp drop in isotope fraction close to the surface followed by a normal bulk diffusion profile. Experimental O-18 profiles in an exchanged (001) oriented single crystal of Fe-doped SrTiO3 were measured by time-of-flight secondary ion mass spectrometry (ToF-SIMS). By extracting the space-charge potential from such profiles, we demonstrate that this method allows the spatially resolved characterization of space-charge layers at the surfaces of crystalline oxides under thermodynamically well-defined conditions.

引用

页码：2356 / 2367

页数：12

共 57 条

[1] Enhancement of oxygen surface exchange kinetics of SrTiO3 by alkaline earth metal oxides [J].

Argirusis, C ;

Wagner, S ;

Menesklou, W ;

Warnke, C ;

Damjanovic, T ;

Borchardt, G ;

Ivers-Tiffée, E .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2005, 7 (20) :3523-3525

[2] The influence of atomic structure on the formation of electrical barriers at grain boundaries in SrTiO3 [J].

Browning, ND ;

Buban, JP ;

Moltaji, HO ;

Pennycook, SJ ;

Duscher, G ;

Johnson, KD ;

Rodrigues, RP ;

Dravid, VP .

APPLIED PHYSICS LETTERS, 1999, 74 (18) :2638-2640

[3] Trapping of oxygen vacancies on twin walls of CaTiO3:: a computer simulation study [J].

Calleja, M ;

Dove, MT ;

Salje, EKH .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (14) :2301-2307

[4] First-principles calculations of the atomic and electronic structure of F centers in the bulk and on the (001) surface of SrTiO3 -: art. no. 064106 [J].

Carrasco, J ;

Illas, F ;

Lopez, N ;

Kotomin, EA ;

Zhukovskii, YF ;

Evarestov, RA ;

Mastrikov, YA ;

Piskunov, S ;

Maier, J .

PHYSICAL REVIEW B, 2006, 73 (06)

[5]

CHIN CJ, 2007, SOLID STATE IONICS, V178, P1081

[6]

Crank J., 1975, The Mathematics of Diffusion, V1

[7]

De Groot SR., 1962, NONEQUILIBRIUM THERM

[8] A universal empirical expression for the isotope surface exchange coefficients (k*) of acceptor-doped perovskite and fluorite oxides [J].

De Souza, RA .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2006, 8 (07) :890-897

[9] Electrical resistance of low-angle tilt grain boundaries in acceptor-doped SrTiO3 as a function of misorientation angle -: art. no. 053502 [J].

De Souza, RA ;

Fleig, J ;

Maier, J ;

Zhang, ZL ;

Sigle, W ;

Rühle, M .

JOURNAL OF APPLIED PHYSICS, 2005, 97 (05)

[10] Determining oxygen isotope profiles in oxides with Time-of-Flight SIMS [J].

De Souza, RA ;

Zehnpfenning, J ;

Martin, M ;

Maier, J .

SOLID STATE IONICS, 2005, 176 (15-16) :1465-1471

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