Uniaxial thermal expansion behaviors and ionic conduction in a layered (NH4)2V3O8

2020 ◽  
Vol 49 (30) ◽  
pp. 10638-10644
Author(s):  
Zhi-Yuan Yao ◽  
Guo-Qin Zhang ◽  
Wan-Wan Yao ◽  
Xiao-Zu Wang ◽  
Yin Qian ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Transverse Vibration ◽  
Ionic Conduction

Layered (NH4)2V3O8 exhibits ZTE and NTE behaviors along the c-axis, and ZTE nature along the a-axis owing to swing-like movement of vanadyl in VO4 tetrahedra and transverse vibration of bridged O atoms connecting VO4 tetrahedra.

Transverse vibration driven large uniaxial negative and zero thermal expansion in boron bridged REPt3B framework materials

2018 ◽  
Vol 20 (21) ◽  
pp. 14876-14883 ◽  
Author(s):  
Sudipta Mondal ◽  
Chandan Mazumdar ◽  
R. Ranganathan
Keyword(s):  
Thermal Expansion ◽  
Rare Earth ◽  
Transverse Vibration ◽  
Low Temperatures ◽  
Linear Chain ◽  
Rare Earth Compounds ◽  
Thermal Expansion Behavior ◽  
Framework Materials ◽  
Expansion Behavior ◽  
Anomalous Thermal Expansion

REPt3B (RE = rare-earth) compounds exhibit anomalous thermal expansion behavior at low temperatures driven by transverse vibration of boron atoms perpendicular to the Pt(2)–B–Pt(2) linear chain.

A Chemical Bonding Approach to Ionic Conduction and Thermal Expansion in Oxide Ion Conductors

2010 ◽  
Vol 72 ◽  
pp. 343-347 ◽  
Author(s):  
Sachi Taniguchi ◽  
Masaru Aniya
Keyword(s):  
Thermal Expansion ◽  
Ionic Conductivity ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Ionic Conduction ◽  
Point Of View ◽  
Semiempirical Methods ◽  
Oxygen Ionic Conductivity ◽  
The Difference ◽  
The Individual

In complex perovskite-type oxides which have been studied as cathode materials, the thermal expansion coefficient increases with the increase in the oxygen ionic conductivity. In the present study, with the aim to explain such a behavior, a research has been carried out from a chemical bond point of view. For oxides A1-xA′xB1-yB′yO with perovskite structure, the ionicity of the individual bond, A-O and B-O, and the thermal expansion coefficient of mixed compounds were estimated by using semiempirical methods. It has been shown that the thermal expansion coefficient and the oxygen ionic conductivity decrease with the increase in the difference of the ionicity between A-O and B-O bonds. It is also found that the tolerance factor and the specific free volume are linearly correlated with the difference of ionicity.

Unusual Thermal Expansion in Hydrogen Bonded Network of an Organic Salt Induced by Large Transverse Vibration of Atoms

2021 ◽  
Vol 21 (3) ◽  
pp. 1428-1433
Author(s):  
Lalita Negi ◽  
Sunil Kumar ◽  
Bhavna Dwivedi ◽  
Dinabandhu Das
Keyword(s):  
Thermal Expansion ◽  
Transverse Vibration ◽  
Organic Salt ◽  
Hydrogen Bonded

scholarly journals Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

2021 ◽  
Vol 8 ◽  
Author(s):  
Bojan A. Marinkovic ◽  
Patricia I. Pontón ◽  
Carl P. Romao ◽  
Thaís Moreira ◽  
Mary Anne White
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Ionic Conduction ◽  
Current Knowledge ◽  
Orthorhombic Phase ◽  
Related Factors ◽  
Challenges And Opportunities ◽  
Potential Applications ◽  
History Of ◽  
Present Understanding

This review presents the history of materials in the A2M3O12 and related ceramic families, including their unusual thermal expansion and the present understanding of its mechanism, and related factors such as hydroscopicity and the monoclinic to orthorhombic phase transition. Other properties, including thermomechanical, thermal and ionic conduction and optical properties, are presented in terms of current knowledge, challenges and opportunities for applications. One of the largest challenges is the production of monoliths, and various methods for consolidation and sintering are summarized. These ceramics have considerable promise when combined with other materials, and recent advances in such composites are presented. These matters are placed in the context of the potential applications of negative and near-zero thermal expansion ceramics, which still present challenges for future materials researchers.

scholarly journals A computational study of the electronic properties, ionic conduction, and thermal expansion of Sm1−xAxCoO3 and Sm1−xAxCoO3−x/2 (A = Ba2+, Ca2+, Sr2+, and x = 0.25, 0.5) as intermediate temperature SOFC cathodes

2017 ◽  
Vol 19 (21) ◽  
pp. 13960-13969 ◽  
Author(s):  
Emilia Olsson ◽  
Xavier Aparicio-Anglès ◽  
Nora H. de Leeuw
Keyword(s):  
Thermal Expansion ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Electronic Properties ◽  
Ionic Conduction ◽  
Computational Study ◽  
Ionic Conductivities ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Substitutional Doping

Substitutional doping of Ca2+, Sr2+, and Ba2+ on the Sm-site in SmCoO3 is reported to improve both electronic and ionic conductivities for applications as solid oxide fuel cell (SOFC) cathodes.

Microstructural and Microchemical Characterization of Nickel Sulfide Inclusions in Plate Glass

1991 ◽  
Vol 49 ◽  
pp. 962-963
Author(s):  
J. Cooper ◽  
O. Popoola ◽  
W. M. Kriven
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Glass Matrix ◽  
Nickel Sulfide ◽  
Plate Glass ◽  
Thermal Expansion Mismatch ◽  
Volume Increase ◽  
Β Phase ◽  
Microchemical Characterization

Nickel sulfide inclusions have been implicated in the spontaneous fracture of large windows of tempered plate glass. Two alternative explanations for the fracture-initiating behaviour of these inclusions have been proposed: (1) the volume increase which accompanies the α to β phase transformation in stoichiometric NiS, and (2) the thermal expansion mismatch between the nickel sulfide phases and the glass matrix. The microstructure and microchemistry of the small inclusions (80 to 250 μm spheres), needed to determine the cause of fracture, have not been well characterized hitherto. The aim of this communication is to report a detailed TEM and EDS study of the inclusions.

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