scholarly journals Towards cubic symmetry for Ir4+ : Structure and magnetism of the antifluorite K2IrBr6

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Nazir Khan ◽  
Danil Prishchenko ◽  
Mary H. Upton ◽  
Vladimir G. Mazurenko ◽  
Alexander A. Tsirlin
Keyword(s):  
Cubic Symmetry

The need of electron microscopy in the study of domains and domain walls in ferroelectrics

1994 ◽  
Vol 52 ◽  
pp. 550-551
Author(s):  
Wenwu Cao
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
High Mobility ◽  
Continuum Theory ◽  
Polarization Vector ◽  
Ferroelectric Materials ◽  
Dielectric Constants ◽  
Nonlocal Coupling ◽  
Cubic Symmetry ◽  
Gradient Energy

Domain structures play a key role in determining the physical properties of ferroelectric materials. The formation of these ferroelectric domains and domain walls are determined by the intrinsic nonlinearity and the nonlocal coupling of the polarization. Analogous to soliton excitations, domain walls can have high mobility when the domain wall energy is high. The domain wall can be describes by a continuum theory owning to the long range nature of the dipole-dipole interactions in ferroelectrics. The simplest form for the Landau energy is the so called ϕ model which can be used to describe a second order phase transition from a cubic prototype,where Pi (i =1, 2, 3) are the components of polarization vector, α's are the linear and nonlinear dielectric constants. In order to take into account the nonlocal coupling, a gradient energy should be included, for cubic symmetry the gradient energy is given by,

Magnetic and magnetoelastic properties of a ferromagnetic single crystal with cubic symmetry

1978 ◽  
Vol 3 ◽  
pp. 479-501 ◽  
Author(s):  
E. Du Trémolet de Lacheisserie ◽  
P. Morin ◽  
J. Rouchy
Keyword(s):  
Single Crystal ◽  
Cubic Symmetry ◽  
Magnetoelastic Properties

scholarly journals An Unexpected Cubic Symmetry in Group IV Alloys Prepared Using Pressure and Temperature

2021 ◽  
Vol 60 (16) ◽  
pp. 9009-9014
Author(s):  
George Serghiou ◽  
Hans Josef Reichmann ◽  
Nicholas Odling ◽  
Kristina Spektor ◽  
Anna Pakhomova ◽  
...  
Keyword(s):  
Group Iv ◽  
Cubic Symmetry

scholarly journals Quasiclassical calculations of Landau level spectrum for 20.5-nm-wide H gTe quantum well: “extremum loop” model and effects of cubic symmetry

2021 ◽  
Vol 47 (1) ◽  
pp. 7-13
Author(s):  
S. V. Gudina ◽  
A. S. Bogolubskiy ◽  
V. N. Neverov ◽  
K. V. Turutkin ◽  
N. G. Shelushinina ◽  
...  
Keyword(s):  
Quantum Well ◽  
Landau Level ◽  
Loop Model ◽  
Cubic Symmetry ◽  
Level Spectrum

Two- and Three-Photon Linear Circular Dichroism in Semiconductors of Cubic Symmetry

2021 ◽  
Author(s):  
R. Ya. Rasulov ◽  
V. R. Rasulov ◽  
I. Eshboltaev ◽  
R. R. Sultonov
Keyword(s):  
Circular Dichroism ◽  
Cubic Symmetry ◽  
Circular Dichroïsm

Hydrothermal Treatment of Coprecipitated YSZ Powders

2010 ◽  
Vol 660-661 ◽  
pp. 983-988 ◽  
Author(s):  
Alexander Rodrigo Arakaki ◽  
Walter Kenji Yoshito ◽  
Valter Ussui ◽  
Dolores Ribeiro Ricci Lazar
Keyword(s):  
Surface Area ◽  
Hydrothermal Treatment ◽  
Gas Adsorption ◽  
X Ray Diffraction ◽  
Electronic Microscopy ◽  
Immersion Method ◽  
Cubic Symmetry ◽  
X Ray ◽  
Granulometric Analysis ◽  
Symmetry Surface

Zirconia stabilized with 8.5 mol% yttria (YSZ) were synthesized by coprecipitation and resulting gels were hydrothermallly treated at 200°C and 220 PSI for 4, 8 and 16 hours. Products were oven dried at 70°C for 24 hours, isostatically pressed as pellets and sintered at 1500 °C for 1 hour. Powders were characterized for surface area with N2 gas adsorption, X-ray diffraction, laser diffraction granulometric analysis and scanning and transmission electronic microscopy. Density of ceramics was measured by an immersion method based on the Archimedes principle. Results showed that powders dried at 70°C are amorphous and after treatment has tetragonal/cubic symmetry. Surface area of powders presented a significant reduction after hydrothermal treatment. Ceramics prepared from hydrothermally treated powders have higher green density but sintered pellets are less dense when compared to that made with powders calcined at 800°C for 1 hour due to the agglomerate state of powders. Solvothermal treatment is a promising procedure to enhance density.

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