Hall mobility of undoped n-type conducting strontium titanate single crystals between 19 K and 1373 K

1995 ◽  
Vol 61 (4) ◽  
pp. 389-395 ◽  
Author(s):  
R. Moos ◽  
W. Menesklou ◽  
K. H. H�rdtl
Keyword(s):  
Single Crystals ◽  
Strontium Titanate ◽  
Hall Mobility

Hall mobility of undoped n-type conducting strontium titanate single crystals between 19 K and 1373 K

1995 ◽  
Vol 61 (4) ◽  
pp. 389-395 ◽  
Author(s):  
R. Moos ◽  
W. Menesklou ◽  
K. H. H�rdtl
Keyword(s):  
Single Crystals ◽  
Strontium Titanate ◽  
Hall Mobility

A-site surface termination in strontium titanate single crystals

2001 ◽  
Vol 79 (12) ◽  
pp. 1786-1788 ◽  
Author(s):  
A. G. Schrott ◽  
J. A. Misewich ◽  
M. Copel ◽  
D. W. Abraham ◽  
Y. Zhang
Keyword(s):  
Single Crystals ◽  
Strontium Titanate ◽  
Surface Termination ◽  
A Site

Cation Transport and Surface Reconstruction in Lanthanum Doped Strontium Titanate at High Temperatures

2002 ◽  
Vol 756 ◽  
Author(s):  
Karsten Gömann ◽  
Günter Borchardt ◽  
Anissa Gunhold ◽  
Wolfgang Maus-Friedrichs ◽  
Bernard Lesage ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Single Crystals ◽  
Surface Reconstruction ◽  
Strontium Titanate ◽  
Cation Transport ◽  
Tracer Diffusion ◽  
Ex Situ ◽  
Spectroscopic Methods ◽  
Time Dependency ◽  
Depth Profiles

ABSTRACTTracer diffusion experiments were carried out in synthetic air at 1573 K in SrTiO3(100) and (110) single crystals, which were either undoped or doped with up to 1 at.% La, respectively. Tracer sources of 139La and 142Nd were applied by ion implantation. The resulting depth profiles were measured by SIMS. The reconstruction of the surface was monitored ex-situ using microscopic and spectroscopic methods including SEM, EPMA, and AFM. The measured tracer diffusivities show no dependency on orientation. The tracer diffusion takes place via cation vacancies. Under oxidizing conditions the dopant is compensated by Sr vacancies. Hence the diffusion is increasing strongly with La concentration. The observed time dependency of the diffusivities may be related to a space charge layer postulated by the current defect chemistry model for donor doped SrTiO3. At high dopant concentrations annealing leads to segregation of bulk La to the surface. La is not significantly incorporated into the secondary crystallites at the surface which consist almost entirely of Sr and O.

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