scholarly journals Inverse Slip Accompanying Twinning and Detwinning during Cyclic Loading of Magnesium Single Crystal

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Qin Yu ◽  
Jian Wang ◽  
Yanyao Jiang
Keyword(s):  
Quantitative Analysis ◽  
Cyclic Loading ◽  
Plastic Strain ◽  
Single Crystal ◽  
Single Crystals ◽  
Work Hardening ◽  
Two Stages ◽  
First Time ◽  
High Work

In situ, observation of twinning and detwinning in magnesium single crystals during tension-compression cyclic loading was made using optical microscopy. A quantitative analysis of plastic strain indicates that twinning and detwinning experience two stages, low and high work hardening de-twinning, and pure re-twinning and fresh twinning combined with retwinning. Slip is always activated. For the first time, inverse slip accompanying with pure retwinning and high work hardening detwinning was experimentally identified, which provides insights in better understanding of the activity of twining, detwinning, and slips.

Refinement of the layered titanosilicate AM-1 from single-crystal X-ray diffraction data

2007 ◽  
Vol 63 (11) ◽  
pp. i186-i186 ◽  
Author(s):  
Stanislav Ferdov ◽  
Uwe Kolitsch ◽  
Christian Lengauer ◽  
Ekkehart Tillmanns ◽  
Zhi Lin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Single Crystal ◽  
Single Crystals ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time ◽  
Ir And Raman ◽  
Bonding Scheme

The structure of the layered noncentrosymmetric titanosilicate AM-1 (also known as JDF-L1, disodium titanium tetrasilicate dihydrate), Na4Ti2Si8O22·4H2O, grown as small single crystals without the use of organics, has been refined from single-crystal X-ray diffraction data. The H atom has been located for the first time, and the hydrogen-bonding scheme is also characterized by IR and Raman spectroscopy. All atoms are in general positions except for the Na, the Ti, one Ti-bound O, one Si-bound O and the water O atoms (site symmetries 2, 4, 4, 2 and 2, respectively).

Growth and Characterization of Single Crystal Epitaxial CoGa on MBE Grown III-V Semiconductors

1988 ◽  
Vol 144 ◽  
Author(s):  
K. C. Garrison ◽  
C. J. Palmstrøm ◽  
R. A. Bartynski
Keyword(s):  
Substrate Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Structural Quality ◽  
High Quality ◽  
Auger Analysis ◽  
Post Deposition

ABSTRACTWe have demonstrated growth of high quality single crystal CoGa films on Ga1−xAlxAs. These films were fabricated in-situ by codeposition of Co and Ga on MBE grown Ga1−xAlxAs(100) surfaces. The elemental composition of the films was determined using Rutherford Backscattering (RBS) and in-situ Auger analysis. The structural quality of the films' surfaces was studied using RHEED (during deposition) and LEED (post deposition). RBS channeling was used to determine the bulk crystalline quality of these films.For ∼500 Å CoGa films grown at ∼450°C substrate temperature, channeling data showed good quality epitaxial single crystals [χmin ∼7%] with minimal dechanneling at the interface.

Properties and growth of large single crystals of one-dimensional organic lead iodine perovskite

CrystEngComm ◽  
2020 ◽  
Vol 22 (42) ◽  
pp. 7090-7094 ◽  
Author(s):  
Yiming Wang ◽  
Yanliang Liu ◽  
Yizhang Wu ◽  
Junjie Jiang ◽  
Chunlin Liu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
One Dimensional ◽  
Organic Lead ◽  
First Time

Here, we demonstrate for the first time the growth of 2 mm × 4 mm × 8 mm sized single crystal one dimensional organic lead iodine perovskite – DMAPbI3 ((CH3)2NH2PbI3).

Successful melting and density measurements of Cu and Ag single crystals with an electrostatic levitation (ESL) system

CrystEngComm ◽  
2014 ◽  
Vol 16 (32) ◽  
pp. 7575-7579 ◽  
Author(s):  
Yong Chan Cho ◽  
Bum-Su Kim ◽  
Hanbyeol Yoo ◽  
Ji Young Kim ◽  
Seunghun Lee ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Electrostatic Levitation ◽  
Density Measurements ◽  
System P ◽  
First Time

By using grain-free single crystal specimens, the melting of Cu and Ag using electrostatic levitation (ESL) and obtaining their high-temperature densities were accomplished for the first time.

scholarly journals Adjustable Positive-Negative Signal in Self-Driven Photodetector based on Cubic CH3NH3PbI3 Large Single Crystal

2021 ◽  
Author(s):  
Xuewei Fu ◽  
Yunying Wang ◽  
Huawei Zhou ◽  
Yan Chen ◽  
Chen Wang ◽  
...  
Keyword(s):  
Response Time ◽  
Single Crystal ◽  
Band Gap ◽  
Single Crystals ◽  
Photocurrent Density ◽  
Large Single Crystal ◽  
Orientation Disorder ◽  
Octahedral Cavity ◽  
First Time ◽  
Negative Signal

<p><b>In this study, for the first time, self-driven photodetector based on cubic CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> large single crystal </b><b>(C-MAPbI<sub>3 </sub>LSC) </b><b>with adjustable positive-negative signal is fabricated. </b><b>The preparation of MAPbI<sub>3 </sub>large single crystal (MAPbI<sub>3 </sub>LSC) is realized by the method of growth-drop-growth (GDG). </b><b>The band gap of </b><b>MAPbI<sub>3 </sub></b><b>single crystals </b><b>with Pm-3m (221) space group (6.134×6.134×6.134 Å, 90.00 x 90.00 x 90.00) </b><b>is 1.58 eV.</b> <b>CH<sub>3</sub>NH<sub>3</sub><sup>+</sup> cation is orientation-disorder </b><b>within the perovskite cubo-octahedral cavity.</b><b> The photocurrent density at 803 nm of the</b><b> C-MAPbI<sub>3 </sub>LSC</b><b> photodetector under different bias voltages is the highest under different wavelength. The </b><b>responsivities (R), response time, external quantum efficiencies (EQE) and the detectivity (D) for </b><b>C-MAPbI<sub>3 </sub>LSC</b><b> photodetector at 803 nm wavelength with 1 W m<sup>-2</sup></b><b>, respectively, is </b><b>508.7 µA/mW, 0.1338 ms, 79.6% and 8.64*10<sup>11</sup> Jones. Notably, </b><b>the C-MAPbI<sub>3 </sub>LSC photodetector can be self-driven under 0 V bias voltage, in particular, the positive and negative values of the photocurrent can be adjusted. The proposed mechanism of poling inducing built-in potential is explained adjustable positive-negative signal in self-driven photodetector based on cubic CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> large single crystal.</b><b></b></p>

scholarly journals Raman Spectroscopy and Single-Crystal High-Temperature Investigations of Bentorite, Ca6Cr2(SO4)3(OH)12·26H2O

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 38
Author(s):  
Rafał Juroszek ◽  
Biljana Krüger ◽  
Irina Galuskina ◽  
Hannes Krüger ◽  
Martina Tribus ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Single Crystal ◽  
Chemical Formula ◽  
Crystal Chemical Formula ◽  
Single Crystal Diffraction ◽  
Bending Vibrations ◽  
X Ray ◽  
First Time

The crystal structure of bentorite, ideally Ca6Cr2(SO4)3(OH)12·26H2O, a Cr3+ analogue of ettringite, is for the first time investigated using X-ray single crystal diffraction. Bentorite crystals of suitable quality were found in the Arad Stone Quarry within the pyrometamorphic rock of the Hatrurim Complex (Mottled Zone). The preliminary semi-quantitative data on the bentorite composition obtained by SEM-EDS show that the average Cr/(Cr + Al) ratio of this sample is >0.8. Bentorite crystallizes in space group P31c, with a = b = 11.1927(5) Å, c =21.7121(10) Å, V = 2355.60(18) Å3, and Z = 2. The crystal structure is refined, including the hydrogen atom positions, to an agreement index R1 = 3.88%. The bentorite crystal chemical formula is Ca6(Cr1.613Al0.387)Σ2[(SO4)2.750(CO3)0.499]Σ3.249(OH)11.502·~25.75H2O. The Raman spectra of bentorite from two different localities exhibit the presence of the main stretching and bending vibrations related to the sulfate group at 983 cm−1 (ν1), 1109 cm−1 (ν3), 442 cm−1 (ν2), and 601 cm−1 (ν4). Moreover, the presence of bands assigned to the symmetric Cr(OH)63− stretching mode and hydroxyl deformation vibrations of Cr–OH units at ~540 cm−1 and ~757 cm−1, respectively, may be used to distinguish between ettringite and bentorite. In situ high temperature single crystal XRD experiments show that the decomposition of bentorite starts at ca. 45 °C and that a dehydroxylation product similar to metaettringite is formed.

scholarly journals Peculiarities of pseudogap in Y0.95Pr0.05Ba2Cu3O7−δ single crystals under pressure up to 1.7 GPa

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
A. L. Solovjov ◽  
L. V. Omelchenko ◽  
E. V. Petrenko ◽  
R. V. Vovk ◽  
V. V. Khotkevych ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Single Crystal ◽  
Single Crystals ◽  
Temperature Interval ◽  
Fluctuation Theory ◽  
Structural Defects ◽  
Fluctuation Conductivity ◽  
First Time ◽  
Effect Of Hydrostatic Pressure

AbstractThe effect of hydrostatic pressure up to P = 1.7 GPa on the fluctuation conductivity σ′(T) and pseudogap ∆*(T) in Y0.95Pr0.05Ba2Cu3O7−δ single crystal with critical temperature Тс = 85.2 K (at P = 0) was investigated. The application of pressure leads to the increase in Tc with dTc/dP = +1.82 K∙GPa−1 while the resistance decreases as dlnρ(100 K)/dP = −(10.5 ± 0.2) %∙GPa−1. Regardless of the pressure, in the temperature interval from Tc to T0 (~88 K at P = 0) the behaviour of σ′(T) is well described by the Aslamazov – Larkin (AL – 3D) fluctuation theory, and above the T0 by the Lawrence – Doniach theory (LD). The Maki-Thompson (MT – 2D) fluctuation contribution is not observed. This indicates the presence of structural defects in the sample induced by Pr. Here it is determined for the first time that when the pressure is applied to the Y1−xPrxBa2Cu3O7−δ single crystal, the pseudogap increases as dlnΔ*/dP = 0.17 GPa–1.

Sign in / Sign up

Export Citation Format

Share Document