Phase development of Bi-2212 superconductor: A time-resolved neutron powder diffraction investigation

1996 ◽  
Vol 11 (2) ◽  
pp. 277-280 ◽  
Author(s):  
Dimitri N. Argyriou ◽  
Julie A. Garcia ◽  
John F. Mitchell ◽  
J. D. Jorgensen ◽  
D. G. Hinks
Keyword(s):  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Lattice Parameters ◽  
Time Resolved ◽  
Temperature Range ◽  
Phase Development

Time-resolved in situ neutron powder diffraction and Rietveld refinement have been used to study the synthesis of Bi-2212 from hydroxide precursors in a 2% O2 atmosphere. Bi-2212 was found to form within the temperature range 770–800 °C. Studies at 800 °C show that Bi-2212 grows rapidly at the expense of Bi-2201. Upon lowering the temperature to 500 °C and changing the atmosphere to Ar, a rapid increase in the lattice parameters was observed. We attribute this change to the loss of oxygen from the Bi-2212 lattice. The final material exhibited a Tc of 94 K.

A time-resolved powder diffraction study of in-situ photodimerization kinetics of 9-methylanthracene using a CCD area detector and parametric Rietveld refinement

2012 ◽  
Vol 68 (4) ◽  
pp. 424-430 ◽  
Author(s):  
Ahmed F. Mabied ◽  
Melanie Müller ◽  
Robert E. Dinnebier ◽  
Shunsuke Nozawa ◽  
Manabu Hoshino ◽  
...  
Keyword(s):  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Quantitative Phase Analysis ◽  
Time Resolved ◽  
Anthracene Derivative ◽  
Area Detector ◽  
Dimensional Growth ◽  
Kinetics Of ◽  
Dimerization Process

The [4π + 4π] photodimerization process of the 9-substituted anthracene derivative crystalline 9-methylanthracene (9-MA) was investigated using time-resolved X-ray powder diffraction. The study was carried out in-situ using a CCD area detector. Sequential and parametric Rietveld refinement was applied for quantitative phase analysis. The results of traditional sequential Rietveld refinement showed that the evolution of the dimerization process can be described using the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model. The parameters of the JMAK equation were obtained successfully by parametric Rietveld refinement and suggest that the reaction follows heterogeneous nucleation and one-dimensional growth with a decreasing nucleation rate.

scholarly journals Site occupancy and lattice parameters in sigma-phase Co–Cr alloys

2012 ◽  
Vol 68 (2) ◽  
pp. 123-127 ◽  
Author(s):  
Jakub Cieslak ◽  
Stanislaw M. Dubiel ◽  
Michael Reissner
Keyword(s):  
Powder Diffraction ◽  
Sigma Phase ◽  
Site Occupancy ◽  
Neutron Powder Diffraction ◽  
Lattice Parameters ◽  
Linear Temperature ◽  
Temperature Range ◽  
Temperature Ranges ◽  
Expansion Coefficients

Neutron powder diffraction was used to study the distribution of Co and Cr atoms over different lattice sites as well as the lattice parameters of sigma-phase compounds Co100 − x Cr x with x = 57.0, 62.7 and 65.8. From the diffractograms recorded in the temperature range of 4.2–300 K it was found for the five crystallographically independent sites that A (2a) and D (8i) are predominantly occupied by Co atoms, while sites B (4f), C (8i) and E (8j) mainly accommodate Cr atoms. The lattice parameters a and c exhibit linear temperature dependencies, with different expansion coefficients in the temperature ranges of 4.2–100 and 100–300 K.

scholarly journals Cation migrations and Bronsted site formation in NH4 form of zeolite omega: a combined in situ time-resolved synchrotron and neutron powder diffraction study

2018 ◽  
Vol 74 (a2) ◽  
pp. e49-e49
Author(s):  
Giada Beltrami ◽  
Annalisa Martucci ◽  
Francesco Di Renzo ◽  
Alberto Alberti ◽  
Maria de Lourdes Guzman-Castillo ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Site Formation ◽  
Time Resolved

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>

In Situ Neutron Powder Diffraction Study of Ti3SiC2 Synthesis

2004 ◽  
Vol 84 (10) ◽  
pp. 2281-2288 ◽  
Author(s):  
Erdong Wu ◽  
Erich H. Kisi ◽  
Shane J. Kennedy ◽  
Andrew J. Studer
Keyword(s):  
Diffraction Study ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction

Oxygen Ordered Phases in LaxSr1−xMnOy(0 ≤x≤ 0.2, 2.5 ≤ y ≤ 3): An In situ Neutron Powder Diffraction Study

2008 ◽  
Vol 20 (4) ◽  
pp. 1636-1645 ◽  
Author(s):  
Leopoldo Suescun ◽  
Bogdan Dabrowski ◽  
James Mais ◽  
Steven Remsen ◽  
James W. Richardson ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Ordered Phases

Rietveld Refinement of the Structure of Ba2YCu3O7-xwith Neutron Powder Diffraction Data

1987 ◽  
Vol 26 (Part 2, No. 5) ◽  
pp. L649-L651 ◽  
Author(s):  
Fujio Izumi ◽  
Hajime Asano ◽  
T\=oru Ishigaki ◽  
Eiji Takayama-Muromachi ◽  
Yoshishige Uchida ◽  
...  
Keyword(s):  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Neutron Powder Diffraction ◽  
Powder Diffraction Data ◽  
Neutron Powder Diffraction Data
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