Ultra-thin Y-doped Zirconia Electrolyte Membranes Synthesized under Photon Irradiation: Structure Evolution and High Temperature Electrochemical Transport Studies

2019 ◽  
Vol 13 (26) ◽  
pp. 15-22 ◽  
Author(s):  
Masaru Tsuchiya ◽  
Shriram Ramanathan
Keyword(s):  
High Temperature ◽  
Structure Evolution ◽  
Photon Irradiation ◽  
Transport Studies ◽  
Electrolyte Membranes ◽  
Zirconia Electrolyte ◽  
Electrochemical Transport

Preparation and Investigation of Reinforced PVP Blend Membranes for High Temperature Polymer Electrolyte Membranes

2018 ◽  
Vol 19 (12) ◽  
pp. 2449-2457 ◽  
Author(s):  
Xiaorui Ren ◽  
Huanhuan Li ◽  
Ke Liu ◽  
Hongyi Lu ◽  
Jingshuai Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membranes ◽  
Blend Membranes ◽  
Electrolyte Membranes

Mode-crystallography analysis of the crystal structures and the low- and high-temperature phase transitions in Na0.5K0.5NbO3

2015 ◽  
Vol 48 (2) ◽  
pp. 318-333 ◽  
Author(s):  
B. Orayech ◽  
A. Faik ◽  
G. A. López ◽  
O. Fabelo ◽  
J. M. Igartua
Keyword(s):  
Phase Transitions ◽  
High Temperature ◽  
Crystal Structures ◽  
Degrees Of Freedom ◽  
High Temperature Phase ◽  
Structure Evolution ◽  
Internal Space ◽  
Temperature Phase ◽  
Conventional Solid State Reaction ◽  
Space Group

Na0.5K0.5NbO3has been synthesized by the conventional solid-state reaction process. The crystal structures and phase transitions, at low and high temperature, determined from the Rietveld refinements of X-ray and neutron powder diffraction data are reported. The structure evolution of Na0.5K0.5NbO3in the temperature range from 2 to 875 K shows the presence of three phase transitions. The first one, at ∼135 K, is discontinuous from the rhombohedralR3c(No. 161) space group to the room-temperature orthorhombicAmm2 (No. 38) space group; the second is discontinuous from the orthorhombic to the tetragonalP4mmspace group (No. 99) at ∼465 K, and the third is continuous from the tetragonal to the cubic Pm\overline{3}m space group (No. 221) at ∼700 K. The obtained phase-transition sequence isR3c→Amm2 →P4mm→Pm\overline{3}m. No previous studies at low temperature have been carried out on the material with composition Na0.5K0.5NbO3. In the course of the determination of the three experimentally found phases, a novel method of refinement is presented. This is a step forward in the use of the symmetry-adapted modes as degrees of freedom in the refinement process: the parameterization of a direction in the internal space of the, in this case, sole irreducible representation, GM4−, responsible for the symmetry breaking from the parent cubic space group to the polar distorted low-symmetry phases. Eventually, this procedure enables the calculation of the spontaneous polarization.

Incorporation of Graphene and Graphene-Based Materials into Membranes As an Alternative Electrolyte Configuration for Low and High Temperature Polymeric Electrolyte Membranes Fuel Cells.

2020 ◽  
Vol MA2020-02 (35) ◽  
pp. 2247-2247
Author(s):  
Maria Perez-Page ◽  
Jianuo Chen ◽  
Andres Parra-Puerto ◽  
Javier Rubio-Garcia ◽  
Anthony R. J. Kucernak ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Polymeric Electrolyte ◽  
Electrolyte Membranes

scholarly journals Tracing Phase Transformation and Lattice Evolution in a TRIP Sheet Steel under High-Temperature Annealing by Real-Time In Situ Neutron Diffraction

Crystals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 360 ◽  
Author(s):  
Dunji Yu ◽  
Yan Chen ◽  
Lu Huang ◽  
Ke An
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Real Time ◽  
Retained Austenite ◽  
Sheet Steel ◽  
Carbon Diffusion ◽  
Structure Evolution ◽  
In Situ Neutron Diffraction

Real-time in situ neutron diffraction was used to characterize the crystal structure evolution in a transformation-induced plasticity (TRIP) sheet steel during annealing up to 1000 °C and then cooling to 60 °C. Based on the results of full-pattern Rietveld refinement, critical temperature regions were determined in which the transformations of retained austenite to ferrite and ferrite to high-temperature austenite during heating and the transformation of austenite to ferrite during cooling occurred, respectively. The phase-specific lattice variation with temperature was further analyzed to comprehensively understand the role of carbon diffusion in accordance with phase transformation, which also shed light on the determination of internal stress in retained austenite. These results prove the technique of real-time in situ neutron diffraction as a powerful tool for heat treatment design of novel metallic materials.

Polyimide Electrolyte Membranes Having Fluorenyl and Sulfopropoxy Groups for High Temperature PEFCs

Fuel Cells ◽  
2005 ◽  
Vol 5 (2) ◽  
pp. 296-301 ◽  
Author(s):  
H. Zhou ◽  
K. Miyatake ◽  
M. Watanabe
Keyword(s):  
High Temperature ◽  
Electrolyte Membranes
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