scholarly journals Laboratory X-ray Diffraction Complex for In Situ Investigations of Structural Phase Evolution of Materials under Gaseous Atmosphere

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 447 ◽  
Author(s):  
Maxim Syrtanov ◽  
Georgiy Garanin ◽  
Egor Kashkarov ◽  
Natalia Pushilina ◽  
Viktor Kudiiarov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Hydrogen Pressure ◽  
Structural Phase ◽  
Phase Evolution ◽  
Gaseous Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ti Powder ◽  
Cp Ti

In this work, a laboratory X-ray diffraction complex for in situ investigations of structural phase evolution of materials under gaseous atmosphere and elevated temperatures was developed. The approbation of the complex was carried out using a commercially pure titanium (CP-Ti) powder, zirconium (Zr-1Nb) alloy and electron beam melted Ti-6Al-4V alloy. It was established that hydrogenation of the CP-Ti powder occurred at a temperature of 500 °C and a hydrogen pressure of 0.5 atm, accompanied by the formation of metastable γ titanium hydride (γ-TiH) phase. The lifetime of the γ-TiH phase was 35–40 min. Decomposition of the γ-TiH occurred after reaching a temperature of 650 °C as a result of the thermally stimulated desorption of hydrogen. The α-Zr → δ-ZrH phase transformation was observed under hydrogenation of the zirconium Zr-1Nb alloy at a temperature of 350 °C and a hydrogen pressure of 0.5 atm. It was revealed that the increase in hydrogenation temperature to 450 °C accelerated this transformation by two times. Hydrogenation of the electron beam melted titanium Ti-6Al-4V alloy at a temperature of 650 °C and hydrogen pressure of 0.5 atm was accompanied by the α → α + β → β + α2 phase transformations.

Thermal stability and miscibility of co-evaporated methyl ammonium lead halide (MAPbX3, X = I, Br, Cl) thin films analysed by in situ X-ray diffraction

2018 ◽  
Vol 6 (24) ◽  
pp. 11496-11506 ◽  
Author(s):  
Paul Pistor ◽  
Thomas Burwig ◽  
Carlo Brzuska ◽  
Björn Weber ◽  
Wolfgang Fränzel
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Thermal Treatment ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
X Ray ◽  
Subsequent Thermal Treatment ◽  
Lead Halide

We present the identification of crystalline phases by in situ X-ray diffraction during growth and monitor the phase evolution during subsequent thermal treatment of CH3NH3PbX3 (X = I, Br, Cl) perovskite thin films.

Microstructure and Mechanical Properties of In Situ TiB2/6061 Composites

2012 ◽  
Vol 535-537 ◽  
pp. 14-17
Author(s):  
Long Hua Zhong ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Rong Wen
Keyword(s):  
Master Alloy ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
X Ray ◽  
Mixing Method ◽  
Particulate Volume Fraction ◽  
Ti Powder ◽  
Particulate Volume

In situ TiB2/6061 composites have been successfully synthesized through chemical reaction between 6061 master alloy, Al-3B master alloy and Ti powder. The composites fabricated by direct melt mixing method was investigated by Scanning Electron Microscope (SEM), Energy Dispersive x-ray Spectroscopy (EDS) and X-Ray Diffraction (XRD), The results shown the existence of TiB2particles. The size of most TiB2particles were just in micron level, and even reached to sub-micron level. The increase in microhardness and tensile strength for the as-prepared composites with 5% particulate volume fraction (PVF) are up to 26.8% and 51.2% respectively.

scholarly journals Mechanistic insight of KBiQ2 (Q = S, Se) using panoramic synthesis towards synthesis-by-design

2021 ◽  
Author(s):  
Rebecca McClain ◽  
Christos D. Malliakas ◽  
Jiahong Shen ◽  
Jiangang He ◽  
Chris Wolverton ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
Panoramic View ◽  
X Ray ◽  
Mechanistic Insight

This work uses in situ powder X-ray diffraction studies to observe crystalline phase evolution over the course of multiple K-Bi-Q (Q = S, Se) reactions, thereby constructing a “panoramic” view of each reaction from beginning to end.

Electrical Transport and In-Situ X-Ray Studies of the Formation of TiSi2 Thin Films on Si

1986 ◽  
Vol 77 ◽  
Author(s):  
J. C. Hensel ◽  
J. M. Vandenberg ◽  
L. F. Mattheiss ◽  
F. C. Unterwald ◽  
A. Maury
Keyword(s):  
Thin Films ◽  
Electrical Transport ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
Metallic Behavior ◽  
Distinctive Features ◽  
X Ray ◽  
Total Energies ◽  
Sputter Deposited

ABSTRACTThe formation of TiSi2 thin films on Si has been investigated by in situ x-ray diffraction and by electrical transport. The x-ray results show unequivocally that the staging proceeds through two orthorhombic polytypes of TiSi2 according to the sequence: sputter-deposited metallic Ti films on Si (001) → TiSi2 (C49 structure) → TiSi2 (C54 structure), with no evidence of lower suicides. Electrical transport shows metallic behavior for all phases and distinctive features in the annealing curves which correlate with the structural transformations. Most importantly, the resistivity, characteristically very high for the C49 phase, undergoes a precipitous drop at the C49 → C54 transition. Total energies for both phases are calculated and, consistent with the occurrence of a structural phase transformation, are found not to differ appreciably.

Influence of Time on Thermal Oxidation of CP-Ti Grade II at 850 °C

2014 ◽  
Vol 614 ◽  
pp. 35-40
Author(s):  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Sorin Iacob Strugaru ◽  
Alexandru Barca ◽  
Carmen Biniuc ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Analytical Techniques ◽  
Phase Evolution ◽  
Thermal Treatments ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Thick Oxide Layer ◽  
Grade Ii ◽  
Cp Ti

The objective of this work is to understand the influence of time on thermal oxidation of CP-Ti Grade II at 850 oC. Thermal treatments were performed for 5 minutes, 15 minutes, 30 minutes, 60 minutes and 120 minutes of isothermal stage. The response of titanium to oxidation at same temperatures and various timings has been investigated, in terms of layer thickness, phase evolution. A variety of experimental and analytical techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM) and ball cratering test have been used to characterize the result of thermal oxidized surfaces. The results showed that oxygen diffused on Ti structure can produce a thick oxide layer with rutile (TiO2) between 3,50 and 10,34 microns, which exhibited good adhesion with the substrate.

Phase Transformations in physical mixtures of Pd-Cu nanoparticles

2013 ◽  
Vol 1528 ◽  
Author(s):  
Vineetha Mukundan ◽  
Jun Yin ◽  
Chuan-Jian Zhong ◽  
Oana Malis
Keyword(s):  
Structural Phase ◽  
Alloy Nanoparticles ◽  
Thermal Treatments ◽  
Cu Nanoparticles ◽  
X Ray Diffraction ◽  
Structural Phase Transformation ◽  
X Ray ◽  
Random Alloy ◽  
Physical Mixtures

ABSTRACTThe temperature induced structural transformations in physical mixtures of 1nm palladium and ultrafine (∼0.5nm) copper nanoparticles supported on carbon were studied using in-situ real time synchrotron based x-ray diffraction. These nanoparticles were subjected to two-step thermal annealing from 25°C to 700°C. The Pd and Cu nanoparticles were found to coalesce forming alloy nanoparticles that subsequently undergo a structural phase transformation from ordered B2 to disordered fcc. The random alloy formed at the end of the thermal treatments was found to be copper-rich.

Phase evolution of (Ni, Co, Mn)O4 during heat treatment with high temperature in situ X-ray diffraction

2016 ◽  
Vol 42 (4) ◽  
pp. 5412-5417 ◽  
Author(s):  
Sungwook Mhin ◽  
HyukSu Han ◽  
Donghyun Kim ◽  
Sunghwan Yeo ◽  
Jung-Il Lee ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
X Ray
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