Atomic structure of undoped Σ = 5 symmetrical tilt grain boundary in strontium titanate

1993 ◽  
Vol 52 (3-4) ◽  
pp. 557-563 ◽  
Author(s):  
V. Ravikumar ◽  
Vinayak P. Dravid
Keyword(s):  
Grain Boundary ◽  
Strontium Titanate ◽  
Atomic Structure ◽  
Symmetrical Tilt ◽  
Tilt Grain Boundary

Atomic structure of undoped Σ=5 symmetrical-tilt grain boundary in strontium titanate

1993 ◽  
Vol 51 ◽  
pp. 986-987
Author(s):  
V. Ravikumar
Keyword(s):  
Grain Boundary ◽  
Strontium Titanate ◽  
Atomic Structure ◽  
Processing Parameters ◽  
Boundary Region ◽  
Boundary Structure ◽  
Reference Structure ◽  
Structure Changes ◽  
Symmetrical Tilt ◽  
Tilt Grain Boundary

Strontium titanate is an important electroceramic material which, under appropriate processing and dopant additions exhibits both varistor and Grain Boundary Layer Capacitor (GBLC) behavior. The presence of electrically active grain boundaries is essential for obtaining these properties. The first step towards correlating the grain boundary structure to properties is to determine the detailed atomic structure of the boundary, which includes its geometric structure, chemistry and electronic structure. We present here our TEM investigation of the atomic structure of an undoped (“pristine”) symmetrical tilt grain boundary in SrTiO3. This provides the basic reference structure, changes to which can be studied as a function of doping and/or processing parameters, and correlated to electrical and dielectric properties.Self-supported TEM samples were made from bicrystals of SrTiO3 through the conventional sample preparation route. Fig. 1 shows a high resolution electron micrograph (Hitachi H9000) of a representative grain boundary region in the sample.

Atomic Structure of the (310) Symmetrical TILT Grain Boundary in Strontium Titanate - A Comparison among Experimental Methods and Atomistic Simulations

1996 ◽  
Vol 54 ◽  
pp. 330-331
Author(s):  
V. Ravikumar ◽  
Vinayak. P. Dravid ◽  
D. Wolf
Keyword(s):  
Grain Boundary ◽  
Strontium Titanate ◽  
Atomic Structure ◽  
Perovskite Oxide ◽  
Atomistic Simulations ◽  
Kikuchi Pattern ◽  
Lattice Statics ◽  
Transmission Electron ◽  
Theoretical Investigations ◽  
Symmetrical Tilt

Strontium Titanate is a prototypical perovskite oxide whose macroscopic electroceramic properties, like varistor and grain boundary barrier layer capacitor (GBBLC) behavior, are controlled by grain boundary (GB) phenomena. In this paper, we present a comparative analysis of the results of both experimental and theoretical investigations of the atomic structure of a (310) symmetrical tilt GB (a Σ=5 (310) [001] GB in the CSL notation) in SrTiO3. Bicrystals of SrTiO3 were procured from Shinkosha Ltd., and electron backscatter kikuchi pattern analysis as well as transmission electron diffraction studies confirm that the GB conforms to the Σ =5 misorientation. The atomic structure of this GB has been investigated using high resolution transmission electron microscopy (HRTEM) and associated image simulations, as well as by atomistic simulations using static iterative energy minimization schemes (“lattice-statics”).2

Structures of a Σ = 9, [110]/{221} symmetrical tilt grain boundary in SrTiO3

2011 ◽  
Vol 46 (12) ◽  
pp. 4162-4168 ◽  
Author(s):  
T. Mitsuma ◽  
T. Tohei ◽  
N. Shibata ◽  
T. Mizoguchi ◽  
T. Yamamoto ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Symmetrical Tilt ◽  
Tilt Grain Boundary

Atomic Structure of ZnO Σ13 [0001]/{134¯0} Symmetric Tilt Grain Boundary

2013 ◽  
Vol 97 (2) ◽  
pp. 617-621 ◽  
Author(s):  
Ji-Young Roh ◽  
Yukio Sato ◽  
Yuichi Ikuhara
Keyword(s):  
Grain Boundary ◽  
Atomic Structure ◽  
Symmetric Tilt ◽  
Tilt Grain Boundary

Local atomic structure of a near-sigma 5 tilt grain boundary in MgO

2013 ◽  
Vol 48 (16) ◽  
pp. 5470-5474 ◽  
Author(s):  
Mitsuhiro Saito ◽  
Zhongchang Wang ◽  
Susumu Tsukimoto ◽  
Yuichi Ikuhara
Keyword(s):  
Grain Boundary ◽  
Atomic Structure ◽  
Local Atomic Structure ◽  
Tilt Grain Boundary

HTREM Studies of Segregated Ga at the Al Sigma 11 (113)[11―0] Symmetrical Tilt Grain Boundary

2004 ◽  
Vol 10 (S02) ◽  
pp. 282-283
Author(s):  
Gunther Richter ◽  
Steffen Schmidt ◽  
Wilfried Sigle ◽  
Manfred Rühle
Keyword(s):  
Grain Boundary ◽  
Symmetrical Tilt ◽  
Tilt Grain Boundary

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Atomic structure of a Σ = 21 grain boundary

1990 ◽  
Vol 5 (11) ◽  
pp. 2658-2662 ◽  
Author(s):  
William Krakow
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Atomic Structure ◽  
Structural Unit ◽  
Defect Structures ◽  
Atomic Column ◽  
Unit Model ◽  
Tilt Grain Boundary

An electron microscope structure image of a σ = 21/[111] tilt grain boundary in Au was obtained and atomic column positions identified to yield a structural unit model of the interface consisting of repeating polyhedron shapes. This result represents the smallest projected spacings at a grain boundary containing defect structures imaged by an electron microscope and interpreted atomistically.

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