Octahedral cation ordering in olivine at high temperature. I: in situ neutron single-crystal diffraction studies on natural mantle olivines (Fa12 and Fa10)

2000 ◽  
Vol 27 (9) ◽  
pp. 623-629 ◽  
Author(s):  
R. Rinaldi ◽  
G. Artioli ◽  
C. C. Wilson ◽  
G. McIntyre
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Cation Ordering ◽  
Single Crystal Diffraction ◽  
Octahedral Cation

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.

Octahedral cation ordering in olivine at high temperature. II: an in situ neutron powder diffraction study on synthetic MgFeSiO 4 (Fa50)

2000 ◽  
Vol 27 (9) ◽  
pp. 630-637 ◽  
Author(s):  
S. A. T. Redfern ◽  
G. Artioli ◽  
R. Rinaldi ◽  
C. M. B. Henderson ◽  
K. S. Knight ◽  
...  
Keyword(s):  
High Temperature ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Cation Ordering ◽  
Octahedral Cation

High-temperature cation ordering in olivine: an in situ Mössbauer study of synthetic (Mg0.55Fe0.45)2 SiO4

ICAME 2007 ◽  
2008 ◽  
pp. 981-985
Author(s):  
Y. A. Abdu ◽  
H. Annersten ◽  
T. Ericsson ◽  
F. C. Hawthorne
Keyword(s):  
High Temperature ◽  
Cation Ordering ◽  
Mössbauer Study

scholarly journals Pressure-and temperature induced phase transitions, piezochromism, NLC behaviour and pressure controlled Jahn–Teller switching in a Cu-based framework

2020 ◽  
Vol 11 (33) ◽  
pp. 8793-8799
Author(s):  
Charles J. McMonagle ◽  
Priyanka Comar ◽  
Gary S. Nichol ◽  
David R. Allan ◽  
Jesús González ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Single Crystal ◽  
Spectroscopic Techniques ◽  
Single Crystal Diffraction ◽  
Jahn Teller ◽  
Pressure Controlled

In situ high-pressure single-crystal diffraction and spectroscopic techniques have been used to study a previously unreported Cu-framework bis[1-(4-pyridyl)butane-1,3-dione]copper(ii) (CuPyr-I).

scholarly journals Applications with a brighter X-ray source and new detectors from Agilent

2014 ◽  
Vol 70 (a1) ◽  
pp. C1734-C1734
Author(s):  
Zoltan Gal ◽  
Tadeusz Skarzynski ◽  
Fraser White ◽  
Oliver Presly ◽  
Adrian Jones ◽  
...  
Keyword(s):  
Data Quality ◽  
Single Crystal ◽  
Measurement System ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Vacuum Technology ◽  
Intelligent Measurement ◽  
Wide Range

Agilent Technologies develop and supply X-ray systems for single-crystal diffraction research, including the SuperNova; a compact, highly reliable and very low maintenance instrument providing X-ray data of the highest quality; and the PX Scanner for testing and characterization of protein crystals in their original crystallization drops (in-situ). The SuperNova and PX Scanner are constantly improving, with recent enhancements including a new range of detectors using an Intelligent Measurement System. The Eos S2, Atlas S2 and Titan S2 detector range employs a smart sensitivity control of the electronic gain and is capable of instantaneously switching its binning modes thus providing unprecedented flexibility in tuning every exposure to provide the highest data quality for a wide range of experiments. We have also developed a completely new micro-focus X-ray source based on Gradient Vacuum technology, with novel filament and target designs. This novel source is an integral part of the new Agilent GV1000 X-ray diffractometer, which has been designed for applications that require even higher brightness of the X-ray beam.

In Situ Observation of the Oxygen Nucleation in Silicon with X-Ray Single Crystal Diffraction

2011 ◽  
Vol 178-179 ◽  
pp. 353-359 ◽  
Author(s):  
Johannes Will ◽  
Alexander Gröschel ◽  
Christoph Bergmann ◽  
Andreas Magerl
Keyword(s):  
Single Crystal ◽  
Waller Factor ◽  
Dynamical Theory ◽  
Mean Value ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Float Zone ◽  
Debye Waller Factor ◽  
The Mean

The measurement of Pendellösungs oscillations was used to observe the time dependent nucleation of oxygen in a Czochralski grown single crystal at 750°C. It is shown, that the theoretical approach of the statistical dynamical theory describes the data well. Within the framework of this theory it is possible to determine the static Debye-Waller-factor as a function of the annealing time by evaluating the mean value of the Bragg intensity and the period length. The temperature influence on the Pendellösungs distance was corrected for by measurement of a Float-zone sample at the same temperature.

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