Surface and grain boundary energy as the key enabler of ferroelectricity in nanoscale hafnia-zirconia: a comparison of model and experiment

Nanoscale ◽  
2017 ◽  
Vol 9 (28) ◽  
pp. 9973-9986 ◽  
Author(s):  
Min Hyuk Park ◽  
Young Hwan Lee ◽  
Han Joon Kim ◽  
Tony Schenk ◽  
Woongkyu Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid Solution ◽  
Grain Boundary ◽  
Boundary Energy ◽  
Energy Model ◽  
Grain Boundary Energy ◽  
Crystalline Phases ◽  
Thermodynamic Surface

The crystalline phases in hafnia-zirconia solid solution thin films are comprehensively studied by a comparison with the thermodynamic surface or interface/grain boundary energy model.

Study of Mn–Co–Ni–O thin films incorporated with Cu and Cu/Sc elements and properties of the detectors

2021 ◽  
pp. 2150227
Author(s):  
Fei Zhang ◽  
Wei Zhou ◽  
Zhiming Huang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Grain Boundary ◽  
Boundary Energy ◽  
Decisive Role ◽  
Grain Boundary Energy ◽  
Solution Deposition ◽  
Chemical Solution Deposition Method ◽  
Voltage Responsivity ◽  
The Stability

Thin films [Formula: see text] (MCNO), [Formula: see text] (MCNCuO) and [Formula: see text] (MCNCuScO) are prepared by Chemical Solution Deposition method. The results show that the addition of Cu and Cu/Sc elements can reduce the grain boundary energy and the grain boundary angle to improve the single crystal degree of MCNO thin film. Through the analysis of MCNCuScO thin film, it is found that the stability of spinel structure mainly depends on the octahedron rather than tetrahedron. The bandgap of the samples from small to large is separately MCNCuScO, MCNCuO and MCNO films. The absorptivity within the waveband of [Formula: see text] plays a decisive role in the performance of the detector. At the same frequency, the MCNCuO thin film detector has the highest voltage responsivity, followed by the MCNCuScO thin film detector, while the MCNO film detector has the lowest responsivity.

Sinterability and Luminescence Property of the MgO-YAG:Ce Phosphor Ceramic with Sintering Aids

2021 ◽  
Vol 16 (2) ◽  
pp. 142-148
Author(s):  
Huaqian Yu ◽  
Huanyu Zhao ◽  
Mu Zhang ◽  
Haijun Peng ◽  
Xudong Sun
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Grain Boundary ◽  
Luminescence Intensity ◽  
Hot Pressing ◽  
Luminescence Property ◽  
Boundary Energy ◽  
Grain Boundary Energy ◽  
Sintering Aids ◽  
Interstitial Solid Solution

MgO-YAG:Ce phosphor ceramics with the addition of Y2O3, SiO2, TiO2 and ZrO2 as sintering aids were developed from commercial powders by hot-pressing. In this work, the effects of Y2O3, SiO2, TiO2, ZrO2 on the phase composition, microstructure, sinterability and luminescence intensity of MgO-YAG:Ce phosphor ceramic were investigated. By comparison, the relative density of MgO-YAG:Ce phosphor ceramic with 2 wt.% SiO2 was satisfying, reaching 98.4%, and the luminescence intensity reached the maximum. Because SiO2 and MgO react to form interstitial solid solution Mg2SiO4, which leads to the increase of the grain boundary energy of the MgO matrix, thereby increasing the sintering performance of MgO-YAG:Ce phosphor ceramics. And SiO2 does not react with YAG, maintaining the excellent luminescence properties of YAG itself.

Evidence for a Grain Boundary Grooving Model of Agglomeration in Polycrystalline Tisi2 Thin Films

1990 ◽  
Vol 202 ◽  
Author(s):  
Thomas Nolan ◽  
Robert Beyers ◽  
Robert Sinclair
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Grain Boundary ◽  
Cross Section ◽  
Boundary Energy ◽  
Film Surface ◽  
Grain Boundary Energy ◽  
Surface And Interface ◽  
Si Substrates ◽  
Polycrystalline Thin Films

ABSTRACTAn equilibrium model for agglomeration based upon the mechanism of grain boundary grooving in polycrystalline thin films is suggested. It involves an energy balance between surface, interface, and grain boundary energies, and predicts parameters which will influence the onset of agglomeration. It has been determined that small grain size, low grain boundary energy, high film surface and interface energies, and growth of single crystal epitaxial layers should promote resistance to agglomeration. Polycrystalline TiSi2 thin films deposited on Si substrates have been observed using cross-section TEM. The micrographs provide evidence that, for these films, the grain boundary grooving mechanism is dominant and most of the modeling assumptions are valid.

Grain Growth in Thin Films With Variable Grain Boundary Energy

1993 ◽  
Vol 317 ◽  
Author(s):  
H.J. Frost ◽  
Y. Hayashi ◽  
C.V. Thompson ◽  
D.T. Walton
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Grain Growth ◽  
Boundary Energy ◽  
High Energy ◽  
Grain Boundary Energy ◽  
Triple Junctions ◽  
Variable Boundary ◽  
Von Neumann ◽  
Grain Size Distributions

ABSTRACTIn simulations of grain growth in thin films we have considered the effect of variations in grain boundary energy. Boundary energy depends on both the misorientation between the two neighboring grains, and the angles which the boundary plane makes with the crystallographic axes of the two crystals. Variations in grain boundary energy mean that dihedral angles at triple junctions deviate from 120°. The proportionality between boundary velocities and local curvatures, and the critical curvature for boundary pinning due to surface grooving also both depend on boundary energy. One effect of variable boundary energies is that grains no longer gain or lose area at rates determined solely by their topology or number of sides. (They no longer obey the Von Neumann/Mullins law). Another effect is that as the grain structures evolve, the fraction of high-energy boundaries decreases. Also, the stagnant structures have broader grain size distributions.

Grain boundary energy in /φ Pure Ice Bicrystals Samples

2021 ◽  
pp. 111094
Author(s):  
C.L. Di Prinzio ◽  
D. Stoler ◽  
Aguirre Varela ◽  
E. Druetta
Keyword(s):  
Grain Boundary ◽  
Boundary Energy ◽  
Grain Boundary Energy

Dihedral angles in Cu–1wt.% Pb: Grain boundary energy and grain boundary triple line effects

2009 ◽  
Vol 57 (8) ◽  
pp. 2527-2537 ◽  
Author(s):  
D. Empl ◽  
L. Felberbaum ◽  
V. Laporte ◽  
D. Chatain ◽  
A. Mortensen
Keyword(s):  
Grain Boundary ◽  
Boundary Energy ◽  
Triple Line ◽  
Dihedral Angles ◽  
Grain Boundary Energy ◽  
Boundary Triple

Grain boundary energy function for α iron

Materialia ◽  
2021 ◽  
pp. 101186
Author(s):  
Rajchawit Sarochawikasit ◽  
Cong Wang ◽  
Poom Kumam ◽  
Hossein Beladi ◽  
Taira Okita ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Energy Function ◽  
Boundary Energy ◽  
Grain Boundary Energy
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