Inhibition of Positronium Formation in Yttria Stabilized Zirconia Nanopowders Modified by Addition of Chromia

2012 ◽  
Vol 733 ◽  
pp. 249-253 ◽  
Author(s):  
Oksana Melikhova ◽  
Jakub Čížek ◽  
Ivan Procházka ◽  
Tetyana E. Konstantinova ◽  
Igor A. Yashchishyn
Keyword(s):  
Grain Boundaries ◽  
Yttria Stabilized Zirconia ◽  
Positronium Formation ◽  
Stabilized Zirconia ◽  
Zirconia Nanopowders ◽  
Triple Points

The effect of chromia additive on defects in yttria stabilized zirconia (YSZ) nanopowders was investigated in this work. It was found that positrons are trapped at vacancy-like misfit defect at grain boundaries and at larger defects situated at triple points. Moreover, a long-lived ortho-positronium contribution was found in YSZ nanopowder without chromia. Addition of chromia prolongs the lifetime of positrons trapped at vacancy-like misfit defects which indicates segregation of Cr ions at grain interfaces and interaction of Cr with vacancy-like misfit defets. Moreover addition of chromia completely suppresses formation of positronium.

Grain-Size-Dependent Thermal Transport Properties in Nanocrystalline Yttria-Stabilized Zirconia

2001 ◽  
Vol 703 ◽  
Author(s):  
Ho-Soon Yang ◽  
J.A. Eastman ◽  
L.J. Thompson ◽  
G.-R. Bai
Keyword(s):  
Grain Boundaries ◽  
Thermal Transport ◽  
Chemical Vapor ◽  
Yttria Stabilized Zirconia ◽  
Organic Chemical ◽  
Stabilized Zirconia ◽  
Size Dependent ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

ABSTRACTUnderstanding the role of grain boundaries in controlling heat flow is critical to the success of many envisioned applications of nanocrystalline materials. This study focuses on the effect of grain boundaries on thermal transport behavior in nanocrystalline yttria-stabilized zirconia (YSZ) coatings prepared by metal-organic chemical vapor deposition.

Systematic Study of Grain Boundary Structure and Chemical Analysis of [100] and [111] Tilt Grain Boundaries in Yttria-Stabilized Zirconia

2004 ◽  
Vol 10 (S02) ◽  
pp. 304-305 ◽  
Author(s):  
James P Buban ◽  
Katsuyuki Matsunaga ◽  
Takahisa Yamamoto ◽  
Yuichi Ikuhara
Keyword(s):  
Chemical Analysis ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Systematic Study ◽  
Yttria Stabilized Zirconia ◽  
Boundary Structure ◽  
Stabilized Zirconia ◽  
Grain Boundary Structure

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

scholarly journals Chemical and structural effects on ionic conductivity at columnar grain boundaries in yttria-stabilized zirconia thin films

2014 ◽  
Vol 122 (1426) ◽  
pp. 430-435 ◽  
Author(s):  
Takanori KIGUCHI ◽  
Yumiko KODAMA ◽  
Toyohiko J. KONNO ◽  
Hiroshi FUNAKUBO ◽  
Osamu SAKURAI ◽  
...  
Keyword(s):  
Thin Films ◽  
Ionic Conductivity ◽  
Grain Boundaries ◽  
Yttria Stabilized Zirconia ◽  
Structural Effects ◽  
Stabilized Zirconia ◽  
Columnar Grain

Sintering of yttria-stabilized zirconia nanopowders studied by positron annihilation spectroscopy

2009 ◽  
Vol 6 (11) ◽  
pp. 2582-2584 ◽  
Author(s):  
J. C����z��ek ◽  
O. Melikhova ◽  
J. Kuriplach ◽  
I. Proch��zka ◽  
T. E. Konstantinova ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Positron Annihilation Spectroscopy ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Nanopowders

Role of grain boundaries on the electrical properties of titania doped yttria stabilized zirconia

1995 ◽  
Vol 30 (4) ◽  
pp. 515-522 ◽  
Author(s):  
M.T. Colomer ◽  
L.S.M. Traqueia ◽  
J.R. Jurado ◽  
F.M.B. Marques
Keyword(s):  
Electrical Properties ◽  
Grain Boundaries ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

scholarly journals Positron annihilation study of yttria-stabilized zirconia nanopowders containing Cr2O3additive

2011 ◽  
Vol 265 ◽  
pp. 012020 ◽  
Author(s):  
I Procházka ◽  
J Čížek ◽  
O Melikhova ◽  
J Kuriplach ◽  
T E Konstantinova ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Nanopowders ◽  
Positron Annihilation Study

Special grain boundaries in YBa2Cu3O7-x

1988 ◽  
Vol 46 ◽  
pp. 870-871
Author(s):  
L.A. Tietz ◽  
C.B. Carter ◽  
D.K. Lathrop ◽  
S.E. Russek ◽  
R.A. Buhrman
Keyword(s):  
Thin Films ◽  
Grain Boundaries ◽  
Mechanical Stability ◽  
Yttria Stabilized Zirconia ◽  
High Angle ◽  
Stabilized Zirconia ◽  
Routine Manner ◽  
Cubic Materials ◽  
Oriented Single Crystal

Much attention has recently been paid to the characterization of twin boundaries in YBa2Cu3O7-x (YBCO). However, in polycrystalline samples other high-angle grain boundaries may have a much more significant effect on, not only the superconducting behavior, but also the chemical and mechanical stability of the material. In the present study, attention has therefore also been focussed on several types of low-angle and high-angle grain boundaries. Such boundaries are frequently found in thin films of this material which are grown on {001}-oriented, single-crystal yttria-stabilized zirconia (YSZ) or magnesium oxide by electron beam co-evaporation of the metals in an oxygen atmosphere. The fact that over most of the substrate these films are oriented epitactically with respect to the zirconia substrate means that these high-angle grain boundaries can be characterized in a relatively routine manner using selected-area diffraction. The high-angle boundaries observed in this study include those produced by 23.5°, 29°, and 45° rotations about [001] and 90° rotations about [100] or [010]. These boundaries are compared to special high-angle grain boundaries in cubic materials.

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