High-Quality Single Crystal Perovskite for Highly Sensitive X-Ray Detector

2020 ◽  
Vol 41 (2) ◽  
pp. 256-259 ◽  
Author(s):  
Xiangshun Geng ◽  
Qixin Feng ◽  
Rui Zhao ◽  
Thomas Hirtz ◽  
Guanhua Dun ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Quality ◽  
X Ray ◽  
High Quality Single Crystal ◽  
Highly Sensitive

Identification and proportion of the enantiomers of the antihypertensive drug chlortalidone in its Form II by high quality single-crystal X-ray diffraction data

2016 ◽  
Vol 118 ◽  
pp. 101-104 ◽  
Author(s):  
Leandro M. Santos ◽  
Olimpia M.M. Santos ◽  
Paula Freire Mendes ◽  
Iara Maria Landre Rosa ◽  
Cameron Capeletti da Silva ◽  
...  
Keyword(s):  
Single Crystal ◽  
Antihypertensive Drug ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
High Quality Single Crystal

Single-crystal elasticity of Ice at high pressures

2020 ◽  
Author(s):  
Zhu Mao ◽  
Weigang Shi
Keyword(s):  
Single Crystal ◽  
High Pressures ◽  
Experimental Studies ◽  
Linear Increase ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
High Quality Single Crystal ◽  
Cauchy Relation ◽  
Longitudinal Modulus

<p>Recent astronomy studies observed the existence of hundreds of ice giants in the universe. Ice is one of the major components of these ice giants. Experimental studies on the physical properties of ice at high pressures are thus important for understanding the composition and evolution of these ice giants. Here, we have synthesized high-quality single-crystal H<sub>2</sub>O-ice with 0.5 m NaCl. Single-crystal elasticity of ice was measured by Brillouin spectroscopy combined with X-ray diffraction up to 93 GPa at 300 K using diamond anvil cells. All the elastic moduli of ice-VII exhibit a nearly linear increase with pressure up to 43 GPa at 300 K, although the off-diagonal modulus C<sub>12</sub> and shear modulus C<sub>44</sub> slightly deviate from the Cauchy relation between 10 and 20 GPa. The longitudinal modulus, C<sub>11</sub>, and C<sub>12</sub> show a clear softening when ice-VII changes to the pre-transition ice-VII state. Meanwhile, we also observed a weak drop in the unit cell volume across this change in our high-quality single-crystal X-ray diffraction measurements. We also present first experimental measurements on the single-crystal elasticity of ice-X. Our experimental results were also used to model the anisotropy of ice at high pressures.</p>

scholarly journals Crystallographic features of ammonium fluoroelpasolites: dynamic orientational disorder in crystals of (NH4)3HfF7 and (NH4)3Ti(O2)F5

2017 ◽  
Vol 73 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Anatoly A. Udovenko ◽  
Alexander A. Karabtsov ◽  
Natalia M. Laptash
Keyword(s):  
Single Crystal ◽  
Electron Density ◽  
Diffraction Data ◽  
Central Atom ◽  
X Ray Diffraction ◽  
Dynamic Nature ◽  
Orientational Disorder ◽  
High Quality ◽  
Structural Units ◽  
X Ray

A classical elpasolite-type structure is considered with respect to dynamically disordered ammonium fluoro-(oxofluoro-)metallates. Single-crystal X-ray diffraction data from high quality (NH4)3HfF7 and (NH4)3Ti(O2)F5 samples enabled the refinement of the ligand and cationic positions in the cubic Fm \bar 3 m (Z = 4) structure. Electron-density atomic profiles show that the ligand atoms are distributed in a mixed (split) position instead of 24e. One of the ammonium groups is disordered near 8c so that its central atom (N1) forms a tetrahedron with vertexes in 32f. However, a center of another group (N2) remains in the 4b site, whereas its H atoms (H2) occupy the 96k positions instead of 24e and, together with the H3 atom in the 32f position, they form eight spatial orientations of the ammonium group. It is a common feature of all ammonium fluoroelpasolites with orientational disorder of structural units of a dynamic nature.

scholarly journals Redetermination of Sr2PdO3 from single-crystal X-ray data

2019 ◽  
Vol 75 (1) ◽  
pp. 30-32
Author(s):  
Gohil S. Thakur ◽  
Hans Reuter ◽  
Claudia Felser ◽  
Martin Jansen
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Diffraction Data ◽  
Structure Refinement ◽  
Structure Type ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Cell Parameters ◽  
Anisotropic Displacement Parameters

The crystal structure redetermination of Sr2PdO3 (distrontium palladium trioxide) was carried out using high-quality single-crystal X-ray data. The Sr2PdO3 structure has been described previously in at least three reports [Wasel-Nielen & Hoppe (1970). Z. Anorg. Allg. Chem. 375, 209–213; Muller & Roy (1971). Adv. Chem. Ser. 98, 28–38; Nagata et al. (2002). J. Alloys Compd. 346, 50–56], all based on powder X-ray diffraction data. The current structure refinement of Sr2PdO3, as compared to previous powder data refinements, leads to more precise cell parameters and fractional coordinates, together with anisotropic displacement parameters for all sites. The compound is confirmed to have the orthorhombic Sr2CuO3 structure type (space group Immm) as reported previously. The structure consists of infinite chains of corner-sharing PdO4 plaquettes interspersed by SrII atoms. A brief comparison of Sr2PdO3 with the related K2NiF4 structure type is given.

Linear parabolic single-crystal diamond refractive lenses for synchrotron X-ray sources

2017 ◽  
Vol 24 (1) ◽  
pp. 103-109 ◽  
Author(s):  
Sergey Terentyev ◽  
Maxim Polikarpov ◽  
Irina Snigireva ◽  
Marco Di Michiel ◽  
Sergey Zholudev ◽  
...  
Keyword(s):  
Single Crystal ◽  
Focal Spot ◽  
Synthetic Diamond ◽  
Picosecond Laser ◽  
Radius Of Curvature ◽  
High Quality ◽  
X Ray ◽  
Single Crystal Diamond ◽  
Refractive Lens ◽  
Focusing Properties

Linear parabolic diamond refractive lenses are presented, designed to withstand high thermal and radiation loads coming from upgraded accelerator X-ray sources. Lenses were manufactured by picosecond laser treatment of a high-quality single-crystal synthetic diamond. Twelve lenses with radius of curvature at parabola apex R = 200 µm, geometrical aperture A = 900 µm and length L = 1.5 mm were stacked as a compound refractive lens and tested at the ESRF ID06 beamline. A focal spot of size 2.2 µm and a gain of 20 were measured at 8 keV. The lens profile and surface quality were estimated by grating interferometry and X-ray radiography. In addition, the influence of X-ray glitches on the focusing properties of the compound refractive lens were studied.

Materials with Dirac Loops: A Potential Solution for Next-generation Electronics

2021 ◽  
Vol 1 ◽  
Keyword(s):  
Electronic Structure ◽  
Single Crystal ◽  
Potential Solution ◽  
Next Generation ◽  
Rhenium Oxide ◽  
High Quality ◽  
High Quality Single Crystal

A high-quality single crystal of rhenium oxide shows significantly large magnetoresistance, potentially originating from a unique electronic structure called “hourglass Dirac chain” protected by the symmetry of the crystal.

Epitaxy of High-Quality Single-Crystal Hexagonal Perovskite YAlO3 on GaAs(111)A Using Laminated Atomic Layer Deposition

2019 ◽  
Vol 19 (4) ◽  
pp. 2030-2036 ◽  
Author(s):  
Lawrence Boyu Young ◽  
Chao-Kai Cheng ◽  
Keng-Yung Lin ◽  
Yen-Hsun Lin ◽  
Hsien-Wen Wan ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Single Crystal ◽  
Atomic Layer ◽  
High Quality ◽  
High Quality Single Crystal ◽  
Layer Deposition
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