scholarly journals Dependence of phase transitions on halide ratio in inorganic CsPb(BrxI1−x)3 perovskite thin films obtained from high-throughput experimentation

2020 ◽  
Vol 8 (43) ◽  
pp. 22626-22631
Author(s):  
H. Näsström ◽  
P. Becker ◽  
J. A. Márquez ◽  
O. Shargaieva ◽  
R. Mainz ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Diagram ◽  
Phase Transitions ◽  
High Throughput ◽  
Combinatorial Synthesis ◽  
X Ray ◽  
Heating And Cooling ◽  
High Throughput Experimentation ◽  
Cooling Phase

The heating and cooling phase diagram of CsPb(BrxI1−x)3 is determined by combinatorial synthesis and high throughput X-ray characterization.

Phase Transitions in Gold Contacts to Gallium Arsenide

1984 ◽  
Vol 37 ◽  
Author(s):  
Edward Beam ◽  
D. D. L. Chung
Keyword(s):  
Gallium Arsenide ◽  
Phase Transitions ◽  
Peritectic Transformation ◽  
Complete Dissolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heating And Cooling ◽  
Similar Phase ◽  
Gold Contacts

AbstractX-ray diffraction was used in situ to study the phase transitions which occurred in 1500 Å Au/GaAs(100) upon heating and cooling. The reaction between Au and GaAs took the form Au + Ga → α Au-Ga. Upon heating, α Au-Ga completely dissolved in liquid Au-Ga. Upon subsequent cooling, β Au-Ga (or Au7Ga2) formed. In 1 atm of nitrogen, phase transitions were observed reversibly at 525 ± 25°C (due to the complete dissolution of α Au-Ga upon heating) and 415 ± 5°C (due to the peritectic transformation of β Au-Ga to α Au-Ga and liquid Au-Ga upon heating). In a vacuum of 425 μ (0.031 Kg/2m) similar phase transitions were observed at 425 ± 25°C and 387 ± 13°C, respectively.

Energy dispersive X-ray reflectivity to study phase transitions in thin films

2004 ◽  
Vol 70 (4-5) ◽  
pp. 611-617 ◽  
Author(s):  
M. Bhattacharya ◽  
M.K. Mukhopadhyay ◽  
S. Pal ◽  
M.K. Sanyal
Keyword(s):  
Thin Films ◽  
Phase Transitions ◽  
Energy Dispersive ◽  
Study Phase ◽  
X Ray

scholarly journals Advances in the Use of Microfluidics to Study Crystallization Fundamentals

2019 ◽  
Vol 10 (1) ◽  
pp. 59-83 ◽  
Author(s):  
Nadine Candoni ◽  
Romain Grossier ◽  
Mehdi Lagaize ◽  
Stéphane Veesler
Keyword(s):  
Phase Diagram ◽  
Diffraction Analysis ◽  
High Throughput ◽  
Concentration Measurement ◽  
Ultraviolet Spectroscopy ◽  
X Ray Diffraction ◽  
Chemical Library ◽  
Microfluidic Platform ◽  
X Ray ◽  
Phase Diagram Determination

This review compares droplet-based microfluidic systems used to study crystallization fundamentals in chemistry and biology. An original high-throughput droplet-based microfluidic platform is presented. It uses nanoliter droplets, generates a chemical library, and directly solubilizes powder, thus economizing both material and time. It is compatible with all solvents without the need for surfactant. Its flexibility permits phase diagram determination and crystallization studies (screening and optimizing experiments) and makes it easy to use for nonspecialists in microfluidics. Moreover, it allows concentration measurement via ultraviolet spectroscopy and solid characterization via X-ray diffraction analysis.

scholarly journals Thermal evolution of the crystal structure and phase transitions of KNbO 3

2018 ◽  
Vol 5 (6) ◽  
pp. 180368 ◽  
Author(s):  
S. L. Skjærvø ◽  
K. Høydalsvik ◽  
A. B. Blichfeld ◽  
M.-A. Einarsrud ◽  
T. Grande
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Thermal Evolution ◽  
Dynamical Instability ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Cell Parameters ◽  
First Order ◽  
Heating And Cooling

The thermal evolution of the crystal structure and phase transitions of KNbO 3 were investigated by high-temperature powder X-ray diffraction and Rietveld refinement of the diffraction data. Two phase transitions from orthorhombic ( Amm 2) to tetragonal ( P 4 mm ) and from tetragonal to cubic ( P m 3 ¯ m ) were confirmed, both on heating and cooling. Both phase transitions are first order based on the observed hysteresis. The mixed displacive and order–disorder nature of the tetragonal to cubic transition is argued based on symmetry and apparent divergence of the atomic positions from pseudo-cubic values. The transition between the orthorhombic and tetragonal phase shows no temperature-dependence for atomic positions and only thermal expansion of the unit cell parameters and is thus discussed in relation to a lattice dynamical instability.

Phase Transitions and the Condition of Near-Interface Layer in PbZrO3 Epitaxial Films on SrRuO3/SrTiO3 Substrate

2019 ◽  
Vol 806 ◽  
pp. 93-99
Author(s):  
Georgiy Lityagin ◽  
Daria Andronikova ◽  
Yurii Bronwald ◽  
Maria Knjazeva ◽  
Ran Gao ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transitions ◽  
Film Surface ◽  
Interface Layer ◽  
X Ray Diffraction ◽  
Interface Area ◽  
Diffraction Profile ◽  
X Ray ◽  
Cubic Phases ◽  
Distribution Of Stress

We have studied temperature-induced phase transitions in PbZrO3 thin films by X-ray diffraction. By tracing the temperature dependence of superstructure reflections we show that the onset of antiferroelectric ordering takes place highly continuously on cooling and another, presumably ferroelectric phase is present at high temperatures, between the antiferroelectric and cubic phases. To clarify the possible reason for this behavior, we have investigated the X-ray diffraction profile with momentum transfer along the normal to the film surface and carried out the relevant simulation using the formalism of scattering by inhomogeneously deformed sample. From the analysis it follows that the near-interface layer is effectively compressed along the normal to the film. We associate this observation with the presence of dislocations through which the film is relaxed. The results suggest that the reasons for the phase transition sequence modification in thin films can be associated with inhomogeneous distribution of stress and defects in the near-interface area.

Temperature and composition dependent phase transitions of lead-free piezoelectric (Bi0.5Na0.5)TiO3–BaTiO3 thin films

2017 ◽  
Vol 19 (30) ◽  
pp. 19992-19997 ◽  
Author(s):  
Zhen Zhou ◽  
Jin Luo ◽  
Wei Sun ◽  
Jing-Feng Li
Keyword(s):  
Thin Films ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Lead Free ◽  
Structure And Properties ◽  
Temperature Dependent

Composition and temperature dependent transitions of structure and properties of BNT–BT films were discussed and a phase diagram was proposed.

scholarly journals High energy x-ray diffraction/x-ray fluorescence spectroscopy for high-throughput analysis of composition spread thin films

2009 ◽  
Vol 80 (12) ◽  
pp. 123905 ◽  
Author(s):  
John M. Gregoire ◽  
Darren Dale ◽  
Alexander Kazimirov ◽  
Francis J. DiSalvo ◽  
R. Bruce van Dover
Keyword(s):  
Thin Films ◽  
Fluorescence Spectroscopy ◽  
High Throughput ◽  
High Energy ◽  
X Ray Diffraction ◽  
High Throughput Analysis ◽  
Throughput Analysis ◽  
X Ray
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