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

Quaternary intermetallics RE2Pt3Ga4In (RE=Y, Gd-Tm) – intergrowth structures of NdRh2Sn4 and TiNiSi related slabs

2020 ◽  
Vol 235 (4-5) ◽  
pp. 117-125
Author(s):  
Myroslava Horiacha ◽  
Maximilian K. Reimann ◽  
Jutta Kösters ◽  
Vasyl‘ I. Zaremba ◽  
Rainer Pöttgen
Keyword(s):  
Single Crystals ◽  
High Frequency ◽  
Magnetic Moments ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Arc Melting ◽  
Intergrowth Structures ◽  
A Site

AbstractThe quaternary gallium-rich intermetallic phases RE2Pt3Ga4In with RE = Y and Gd-Tm were synthesized by arc-melting of the elements and subsequent annealing. Small single crystals were obtained by high-frequency annealing of the samples in sealed tantalum ampoules. The polycrystalline samples were characterized through their X-ray powder patterns. The RE2Pt3Ga4In phases crystallize with a site ordering variant of the orthorhombic Y2Rh3Sn5 type, space group Cmc 21. The structures of Gd2Pt3Ga4In, Dy2Pt3Ga4.14In0.86, Er2Pt3Ga4.17In0.83 and Tm2Pt3Ga4.21In0.79 were refined from single-crystal X-ray diffraction data. The single crystals reveal small homogeneity ranges RE2Pt3Ga4±xIn1±x. The striking geometrical structural building units are slightly distorted trigonal prisms around the three crystallographically independent platinum atoms: Pt1@RE4Ga2, Pt2@RE2Ga4 and Pt3@RE2Ga2In2. Based on these prismatic building units, the RE2Pt3Ga4In structures can be described as intergrowth variants of TiNiSi and NdRh2Sn4 related structural slabs. Temperature dependent magnetic susceptibility studies of Gd2Pt3Ga4In and Tb2Pt3Ga4In show Curie-Weiss behavior and the experimental magnetic moments confirm stable trivalent gadolinium respectively terbium. Gd2Pt3Ga4In and Tb2Pt3Ga4In order antiferromagnetically at TN = 15.8(1) and 26.0(1) K. Magnetization curves at 3 K show field-induced spin reorientations.

A study on the effects of mixed organic cations on the structure and properties in lead halide perovskites

2020 ◽  
Vol 22 (5) ◽  
pp. 3105-3111 ◽  
Author(s):  
Chao Wu ◽  
Daoyou Guo ◽  
Peigang Li ◽  
Shunli Wang ◽  
Aiping Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Single Crystals ◽  
Electrical Transport ◽  
Organic Cation ◽  
Organic Cations ◽  
Structure And Properties ◽  
Electrical Transport Properties ◽  
Halide Perovskites ◽  
A Site ◽  
Lead Halide

Four types of organic cation-mixed single crystals were successfully synthesized by partially substituting A site cations to investigate the effect of organic cations on structure, optical features, thermal stability, and electrical transport properties.

Synthesis and performance of A-site deficient lanthanum-doped strontium titanate by nanoparticle based spray pyrolysis

2012 ◽  
Vol 201 ◽  
pp. 26-36 ◽  
Author(s):  
Dariusz Burnat ◽  
Andre Heel ◽  
Lorenz Holzer ◽  
Dariusz Kata ◽  
Jerzy Lis ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Strontium Titanate ◽  
And Performance ◽  
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.

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

Combined effects of A-site deficiency and dopant content on the transport properties of Nb-doped strontium titanate

Ionics ◽  
1997 ◽  
Vol 3 (1-2) ◽  
pp. 16-22 ◽  
Author(s):  
J. C. C. Abrantes ◽  
J. A. Labrincha ◽  
J. R. Frade
Keyword(s):  
Transport Properties ◽  
Strontium Titanate ◽  
Combined Effects ◽  
Dopant Content ◽  
A Site
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