scholarly journals Thermal expansion in BaRuO3 perovskites – an unusual case of bond strengthening at high temperatures

2017 ◽  
Vol 46 (9) ◽  
pp. 2974-2980 ◽  
Author(s):  
Paula Kayser ◽  
Sean Injac ◽  
Brendan J. Kennedy ◽  
Andre L. Menezes de Oliveira ◽  
Yuichi Shirako ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
High Resolution ◽  
High Temperatures ◽  
Room Temperature ◽  
Unusual Case ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Dependences

The temperature dependences of the structures of three polytypes of BaRuO3 have been investigated between room temperature and 1000 °C using high resolution synchrotron X-ray diffraction.

Structural and thermal properties of Cu1.75−xMxTe crystals

2020 ◽  
Vol 34 (19) ◽  
pp. 2050180
Author(s):  
Y. I. Aliyev ◽  
Y. G. Asadov ◽  
L. B. Rustamova ◽  
A. O. Dashdemirov ◽  
N. A. Ismayilova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Room Temperature ◽  
Lattice Parameters ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cubic Phases ◽  
Temperature Dependences ◽  
Cubic Structure

Single crystals of Cu[Formula: see text]Te, Cu[Formula: see text]Zn[Formula: see text]Te and Cu[Formula: see text]Cd[Formula: see text]Te compounds were synthesized by Brijmen method and their crystal structure was studied by X-ray diffraction. The hexagonal, orthorhombic aand cubic structure phases of these compounds have been determined at room-temperature. Phase transitions at high-temperatures were observed. Lattice parameters for hexagonal, orthorhombic and cubic phases have been determined in the temperature range of [Formula: see text]–1073 K. From the temperature dependences of the lattice parameters, the coefficients of thermal expansion of the existing modifications in the main crystallographic directions were calculated.

scholarly journals An examination of the thermal expansion of urea using high-resolution variable-temperature X-ray powder diffraction

2005 ◽  
Vol 38 (6) ◽  
pp. 1038-1039 ◽  
Author(s):  
Robert Hammond ◽  
Klimentina Pencheva ◽  
Kevin J. Roberts ◽  
Patricia Mougin ◽  
Derek Wilkinson
Keyword(s):  
Thermal Expansion ◽  
High Resolution ◽  
Variable Temperature ◽  
X Ray Diffraction ◽  
Polymorphic Transformations ◽  
X Ray ◽  
Thermal Expansion Coefficients ◽  
Cell Dimensions ◽  
Expansion Coefficients ◽  
Unit Cell Dimensions

Variable-temperature high-resolution capillary-mode powder X-ray diffraction is used to assess changes in unit-cell dimensions as a function of temperature over the range 188–328 K. No evidence was found for any polymorphic transformations over this temperature range and thermal expansion coefficients for urea were found to be αa= (5.27 ± 0.26) × 10−5 K−1and αc= (1.14 ± 0.057) × 10−5 K−1.

scholarly journals Experimental Investigations of the Interaction of SO2 with MgO

1999 ◽  
Vol 590 ◽  
Author(s):  
Andrea Freitag ◽  
J. A. Rodriguez ◽  
J. Z. Larese
Keyword(s):  
High Resolution ◽  
Film Thickness ◽  
Room Temperature ◽  
Temperature Programmed Desorption ◽  
Experimental Investigations ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Temperature Programmed ◽  
X Ray Absorption

ABSTRACTHigh resolution adsorption isotherms, temperature programmed desorption (TPD), x-ray diffraction (XRD) and x-ray absorption near edge spectroscopy (XANES) methods were used to investigate the interaction of SO2 with high quality MgO powders. The results of these investigations indicate that when SO2 is deposited on MgO in monolayer quantities at temperatures near 100K both SO3 and SO4 species form that are not removed by simply pumping on the pre-dosed samples at room temperature. TPD and XANES studies indicate that heating of pre-dosed MgO samples to temperatures above 350 °C is required for full removal of the SO3/SO4 species. XANES measurements made as a function of film thickness indicate for coverages near monolayer completion that the SO4 species form first.

scholarly journals Neutron and high-resolution room-temperature X-ray data collection from crystallized lytic polysaccharide monooxygenase

2015 ◽  
Vol 71 (11) ◽  
pp. 1448-1452 ◽  
Author(s):  
John-Paul Bacik ◽  
Sophanit Mekasha ◽  
Zarah Forsberg ◽  
Andrey Kovalevsky ◽  
Jay C. Nix ◽  
...  
Keyword(s):  
High Resolution ◽  
Diffraction Data ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Lytic Polysaccharide Monooxygenase ◽  
Data Set ◽  
X Ray ◽  
Processing Enzymes ◽  
Bacteria And Fungi ◽  
Polysaccharide Monooxygenase

Bacteria and fungi express lytic polysaccharide monooxgyenase (LPMO) enzymes that act in conjunction with canonical hydrolytic sugar-processing enzymes to rapidly convert polysaccharides such as chitin, cellulose and starch to single monosaccharide products. In order to gain a better understanding of the structure and oxidative mechanism of these enzymes, large crystals (1–3 mm3) of a chitin-processing LPMO from the Gram-positive soil bacteriumJonesia denitrificanswere grown and screened for their ability to diffract neutrons. In addition to the collection of neutron diffraction data, which were processed to 2.1 Å resolution, a high-resolution room-temperature X-ray diffraction data set was collected and processed to 1.1 Å resolution in space groupP212121. To our knowledge, this work marks the first successful neutron crystallographic experiment on an LPMO. Joint X-ray/neutron refinement of the resulting data will reveal new details of the structure and mechanism of this recently discovered class of enzymes.

Behaviors of the Zr–1.0Sn–0.39Nb–0.31Fe–0.05Cr Alloy at High Temperature

2011 ◽  
Vol 399-401 ◽  
pp. 80-84
Author(s):  
Yi Yuan Tang ◽  
Jie Li Meng ◽  
Kai Lian Huang ◽  
Jian Lie Liang
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
High Temperature ◽  
Oxide Film ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thin Oxide Film ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

Phase transformation of the Zr-1.0Sn-0.39Nb-0.31Fe-0.05Cr alloy was investigated by high temperature X-ray diffraction (XRD). The XRD results revealed that the alloy contained two precipitates at room temperature, namely β-Nb and hexagonal Zr(Nb,Fe,Cr,)2. β-Nb was suggested to dissolve into the α-Zr matrix at the 580oC. Thin oxide film formed at the alloy’s surface was identified as mixture of the monoclinic Zr0.93O2and tetragonal ZrO2, when the temperature reached to 750oC and 850 oC. The thermal expansion coefficients of αZr in this alloy was of αa = 8.39×10-6/°C, αc = 2.48×10-6/°C.

Thermal expansion of single-crystalline β-Ga2O3 from RT to 1200 K studied by synchrotron-based high resolution x-ray diffraction

2018 ◽  
Vol 113 (18) ◽  
pp. 182102 ◽  
Author(s):  
Zongzhe Cheng ◽  
Michael Hanke ◽  
Zbigniew Galazka ◽  
Achim Trampert
Keyword(s):  
Thermal Expansion ◽  
High Resolution ◽  
X Ray Diffraction ◽  
Single Crystalline ◽  
X Ray

High-Resolution X-Ray Diffraction Analysis of “Devicequality” Cubic GaN Grown on (001)GaAs Substrate Prepared by Atomic-Hydrogen Treatment At “High Temperatures”

1997 ◽  
Vol 482 ◽  
Author(s):  
A. Yoshikawa ◽  
Z. X. Qin ◽  
H. Nagano ◽  
Y. Sugure ◽  
A. W. Jia ◽  
...  
Keyword(s):  
High Resolution ◽  
High Temperatures ◽  
Atomic Hydrogen ◽  
Plasma Source ◽  
Hydrogen Treatment ◽  
X Ray Diffraction ◽  
Reciprocal Space Mapping ◽  
X Ray ◽  
Cubic Gan ◽  
First Time

AbstractCubic GaN (c-GaN) layers were grown by if-plasma source MBE on (001) GaAs prepared by atomic-hydrogen treatment at “high temperatures”, and the structural properties of the epilayers were investigated by the high-resolution X-ray rocking curve and the reciprocal space mapping measurements. The growth temperature was varied from 620 to 740°C. It was found that single domain “device-quality” c-GaN layers could be grown for the first time; the FWHM of the X-ray rocking curves for the (002) c-GaN could be as small as 70 - 90 arcsec and the inclusion of h-GaN phase in the c-GaN epilayers grown at temperatures above 680°C could be less than 4×10-3.

Combined Room Temperature Photoluminescence And High Resolution X-Ray Diffraction Mapping Of Semiconductor Wafers

1995 ◽  
Vol 406 ◽  
Author(s):  
S Cockerton ◽  
M L Cooke ◽  
D K Bowen ◽  
B K Tanner
Keyword(s):  
High Resolution ◽  
Room Temperature ◽  
Poisson Ratio ◽  
X Ray Diffraction ◽  
Rocking Curve ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Composition Variation ◽  
Line Context ◽  
And Performance

AbstractWe describe the characteristics and performance of a combined desk-side high resolution X-ray diffractometer and room temperature photoluminescence spectrometer designed for rapid mapping of compound semiconductors in a production line context. The combined data for AIGaAs on GaAs suggest that recent measurements of the lattice constant and the Poisson ratio of AlAs may be more reliable than earlier published values. We illustrate the instrument performance in showing that for lattice matched ternary GaInP on GaAs systems, the X-ray rocking curve maps are much more sensitive to composition variation than the photoluminescence spectra.

Controllable Thermal Expansion in In2-xFexMoxO12

2014 ◽  
Vol 602-603 ◽  
pp. 677-680
Author(s):  
Mei Mei Wu ◽  
Yun Tao Liu
Keyword(s):  
Thermal Expansion ◽  
Solid Solutions ◽  
Room Temperature ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Orthorhombic Phase ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fe Content

The structural and thermal expansion properties of solid solutions In2-xFexMo3O12have been characterized using X-ray diffraction. The lattice parameters decrease linearly with increasing Fe content at room temperature. All compounds exhibit monoclinic structure at room temperature, and transform to orthorhombic phase upon heating. Monoclinic In2-xFexMo3O12(x= 0.3, 1.0 and 1.3) possess strong positive thermal expansion, while the linear thermal expansion coefficient of orthorhombic phase varies from zero/near-zero to positive with increasing Fe3+content.

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