scholarly journals Reinvestigation of crystal symmetry and fluctuations in La2CuO4

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
A. Sapkota ◽  
T. C. Sterling ◽  
P. M. Lozano ◽  
Yangmu Li ◽  
Huibo Cao ◽  
...  
Keyword(s):  
Crystal Symmetry

Microstructure and crystal symmetry of Pb2Sr2(Y/Ca)Cu3O9−δ

1990 ◽  
Vol 48 (4) ◽  
pp. 64-65
Author(s):  
Y. P. Lin ◽  
J. S. Xue ◽  
J. E. Greedan
Keyword(s):  
Electron Diffraction ◽  
High Temperature Superconductors ◽  
Carbon Film ◽  
Basic Structure ◽  
Crystal Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Space Groups ◽  
New Family ◽  
Convergent Beam

A new family of high temperature superconductors based on Pb2Sr2YCu3O9−δ has recently been reported. One method of improving Tc has been to replace Y partially with Ca. Although the basic structure of this type of superconductors is known, the detailed structure is still unclear, and various space groups has been proposed. In our work, crystals of Pb2Sr2YCu3O9−δ with dimensions up to 1 × 1 × 0.25.mm and with Tc of 84 K have been grown and their superconducting properties described. The defects and crystal symmetry have been investigated using electron microscopy performed on crushed crystals supported on a holey carbon film.Electron diffraction confirmed x-ray diffraction results which showed that the crystals are primitive orthorhombic with a=0.5383, b=0.5423 and c=1.5765 nm. Convergent Beam Electron Diffraction (CBED) patterns for the and axes are shown in Figs. 1 and 2 respectively.

Infrared spectroscopic study of the YPO4-YCrO4 system

1985 ◽  
Vol 50 (10) ◽  
pp. 2139-2145
Author(s):  
Alexander Muck ◽  
Eva Šantavá ◽  
Bohumil Hájek
Keyword(s):  
Spectroscopic Study ◽  
Infrared Spectra ◽  
Point Of View ◽  
Mixed Crystals ◽  
Crystal Symmetry ◽  
Infrared Spectroscopic Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectroscopic ◽  
Diffraction Patterns

The infrared spectra and powder X-ray diffraction patterns of polycrystalline YPO4-YCrO4 samples are studied from the point of view of their crystal symmetry. Mixed crystals of the D4h19 symmetry are formed over the region of 0-30 mol.% YPO4 in YCrO4. The Td → D2d → D2 or C2v(GS eff) correlation is appropriate for both PO43- and CrO43- anions.

scholarly journals Crystal symmetry breaking in few-quintuple Bi2Te3 films: Applications in nanometrology of topological insulators

2010 ◽  
Vol 96 (15) ◽  
pp. 153103 ◽  
Author(s):  
K. M. F. Shahil ◽  
M. Z. Hossain ◽  
D. Teweldebrhan ◽  
A. A. Balandin
Keyword(s):  
Symmetry Breaking ◽  
Topological Insulators ◽  
Crystal Symmetry

Effect of oxygen vacancies and crystal symmetry on piezocatalytic properties of Bi2WO6 ferroelectric nanosheets for wastewater decontamination

2021 ◽  
Author(s):  
Zihan Kang ◽  
Enzhu Lin ◽  
Ni Qin ◽  
Jiang Wu ◽  
Baowei Yuan ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Oxygen Vacancies ◽  
Mechanical Energy ◽  
Crystal Symmetry ◽  
Characteristic P ◽  
Novel Technique ◽  
Effect Of Oxygen

Piezocatalysis emerged as a novel technique to make use of mechanical energy in dealing with organic pollutants in wastewater. In this work, the ferroelectric Bi2WO6 (BWO) nanosheets with a characteristic...

scholarly journals Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators

2015 ◽  
Vol 14 (3) ◽  
pp. 318-324 ◽  
Author(s):  
Ilija Zeljkovic ◽  
Yoshinori Okada ◽  
Maksym Serbyn ◽  
R. Sankar ◽  
Daniel Walkup ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Crystal Symmetry ◽  
Mass Generation ◽  
Dirac Mass ◽  
Topological Crystalline Insulators

scholarly journals Crystal symmetry lowering in chiral multiferroic Ba3TaFe3Si2O14 observed by x-ray magnetic scattering

2017 ◽  
Vol 95 (20) ◽  
Author(s):  
M. Ramakrishnan ◽  
Y. Joly ◽  
Y. W. Windsor ◽  
L. Rettig ◽  
A. Alberca ◽  
...  
Keyword(s):  
Crystal Symmetry ◽  
Magnetic Scattering ◽  
X Ray

scholarly journals Integration, scaling, space-group assignment and post-refinement

2010 ◽  
Vol 66 (2) ◽  
pp. 133-144 ◽  
Author(s):  
Wolfgang Kabsch
Keyword(s):  
Data Reduction ◽  
Efficient Algorithm ◽  
Spot Size ◽  
Crystal Symmetry ◽  
Automatic Determination ◽  
Scaling Factors ◽  
Space Group ◽  
Group Assignment ◽  
Software Packages

Important steps in the processing of rotation data are described that are common to most software packages. These programs differ in the details and in the methods implemented to carry out the tasks. Here, the working principles underlying the data-reduction packageXDSare explained, including the new features of automatic determination of spot size and reflecting range, recognition and assignment of crystal symmetry and a highly efficient algorithm for the determination of correction/scaling factors.

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