scholarly journals Time resolved studies of phase transformations using high temperature powder diffraction

2000 ◽  
Author(s):  
M. J. Kramer
Keyword(s):  
High Temperature ◽  
Phase Transformations ◽  
Powder Diffraction ◽  
Time Resolved

Time-resolved, high-temperature X-ray powder diffraction of BaB2O4

1994 ◽  
Vol 152 (1) ◽  
pp. 361-366 ◽  
Author(s):  
Yasunao Oyama ◽  
Hideo Yabashi ◽  
Masashi Hasegawa ◽  
Humihiko Takei
Keyword(s):  
High Temperature ◽  
Powder Diffraction ◽  
Time Resolved ◽  
X Ray

Time-Resolved Observations of Solid Reactions and Structure Transitions using a PSD, An SSD and Computer Aided Measurement and Control

1991 ◽  
Vol 35 (A) ◽  
pp. 415-423 ◽  
Author(s):  
Takamitsu Yamanaka ◽  
Shinji Kawasaki ◽  
Tsuyoshi Shibata
Keyword(s):  
High Temperature ◽  
Powder Diffraction ◽  
Counting Efficiency ◽  
Energy Dispersive ◽  
Position Sensitive Detector ◽  
Sensitive Detector ◽  
Time Resolved ◽  
Kinetic Information ◽  
Dehydration Reactions ◽  
Position Sensitive

AbstractFor time-resolved diffraction studies under high temperature and/or high pressure, we designed a new diffractometer incorporating a curved position sensitive detector and tested the rapid intensity measurement and the resolution of the angular dispersive diffraction. The diffraction profiles were compared with those from energy dispersive diffraction. Rapid intensity collection has been carried out with a CAMAC module. A curved position sensitive detector with a 120° working angular region was installed on the off-centered four circle diffractometer. Only a few seconds were needed to obtain a whole powder diffraction because of the extremely high counting efficiency due to the streamer mode.Time-resolved observations of the dehydration reactions of Mg(OH)2 and Ca(OH)2, have been undertaken by angular dispersive and energy dispersive x-ray powder diffraction at high temperature. The in situ observations of the dehydration process provide kinetic information, such as the reaction rate, the apparent activation energy and the dehydration mechanism.

Time-resolved studies of Ti34−xCu47Zr11Ni8Six metallic glass devitrification using high temperature X-ray powder diffraction

2001 ◽  
Vol 290 (2-3) ◽  
pp. 163-172 ◽  
Author(s):  
Daniel J Sordelet ◽  
Matthew J Kramer ◽  
Matthew F Besser ◽  
Elena Rozhkova
Keyword(s):  
High Temperature ◽  
Metallic Glass ◽  
Powder Diffraction ◽  
Time Resolved ◽  
X Ray

A Dynamic High Temperature XRPD Study of the Calcination of Zirconium Hydroxide

1988 ◽  
Vol 3 (4) ◽  
pp. 234-239 ◽  
Author(s):  
G. T. Mamott ◽  
P. Barnes ◽  
S. E. Tarling ◽  
S. L. Jones ◽  
C. J. Norman
Keyword(s):  
High Temperature ◽  
Powder Diffraction ◽  
Zirconium Hydroxide ◽  
Starting Material ◽  
Chemical Changes ◽  
Time Resolved ◽  
Amorphous Component ◽  
X Ray ◽  
Tetragonal Form ◽  
Increasing Temperature

AbstractStructural and chemical changes in materials can be dynamically observed by using time resolved X-ray Powder Diffraction (XRPD) to collect patterns as these events happen. During calcination of amorphous zirconium hydroxide, Zr(OH)4, and its crystallisation to a metastable tetragonal form of zirconia, ZrO2, patterns have been collected at 10°C temperature intervals during a heating sequence to 500°C. These patterns show both the onset of ordering within the amorphous starting material and the progress of its conversion into crystalline zirconia. Events are recorded within the pattern in the form of peak growth and reduction in amorphous component of the pattern with increasing temperature.

Time-resolved in situ powder X-ray diffraction reveals the mechanisms of molten salt synthesis

2016 ◽  
Vol 52 (96) ◽  
pp. 13865-13868 ◽  
Author(s):  
Saul J. Moorhouse ◽  
Yue Wu ◽  
Hannah C. Buckley ◽  
Dermot O'Hare
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Powder Diffraction ◽  
High Energy ◽  
Chemical Processes ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

We report the first use of high-energy monochromatic in situ X-ray powder diffraction to gain unprecedented insights into the chemical processes occurring during high temperature, lab-scale metal oxide syntheses.

High temperature 27Al NMR time resolved study. Application to the CaO-Al2O3 binary system

1995 ◽  
Vol 92 ◽  
pp. 1871-1876 ◽  
Author(s):  
B Touzo ◽  
D Trumeau ◽  
D Massiot ◽  
I Farnan ◽  
JP Coutures
Keyword(s):  
High Temperature ◽  
Binary System ◽  
27Al Nmr ◽  
Time Resolved ◽  
Study Application

Monitoring Polymer-Assisted Mechanochemical Cocrystallisation Through in Situ X-Ray Powder Diffraction

2020 ◽  
Author(s):  
Luzia S. Germann ◽  
Sebastian T. Emmerling ◽  
Manuel Wilke ◽  
Robert E. Dinnebier ◽  
Mariarosa Moneghini ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Powder Diffraction ◽  
Reaction Rate ◽  
Polymer Additives ◽  
Time Resolved ◽  
X Ray

Time-resolved mechanochemical cocrystallisation studies have so-far focused solely on neat and liquid-assisted grinding. Here, we report the monitoring of polymer-assisted grinding reactions using <i>in situ</i> X-ray powder diffraction, revealing that reaction rate is almost double compared to neat grinding and independent of the molecular weight and amount of used polymer additives.<br>

Quantitative FM Spectroscopy at High Temperatures: The Detection of 1CH2 behind Shock Waves

2000 ◽  
Vol 214 (12) ◽  
Author(s):  
G. Friedrichs ◽  
H.Gg. Wagner
Keyword(s):  
High Temperature ◽  
Shock Waves ◽  
High Temperatures ◽  
Frequency Modulation ◽  
Modulation Frequency ◽  
Optical Power ◽  
Time Resolved ◽  
Signal Conversion ◽  
High Modulation ◽  
Singlet Methylene

The technique of time resolved frequency modulation (FM) spectroscopy has been shown to provide a very sensitive means to detect small radicals behind shock waves. Features of high temperature FM spectroscopy behind shock waves will be discussed and a general signal conversion procedure to carry out quantitative concentration measurements will be presented.Using a high modulation frequency, a high modulation index and high total optical power, singlet methylene radicals (α

Sign in / Sign up

Export Citation Format

Share Document