scholarly journals Framework flexibility and the negative thermal expansion mechanism of copper(I) oxideCu2O

2014 ◽  
Vol 89 (21) ◽  
Author(s):  
Leila H. N. Rimmer ◽  
Martin T. Dove ◽  
Björn Winkler ◽  
Dan J. Wilson ◽  
Keith Refson ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Expansion Mechanism

First-principles study of negative thermal expansion mechanism in A-site-ordered perovskite SrCu3Fe4O12

RSC Advances ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 1801-1807 ◽  
Author(s):  
Hongping Li ◽  
Shuai Liu ◽  
Lin Chen ◽  
Jiandong Zhao ◽  
Beibei Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
First Principles ◽  
Negative Thermal Expansion ◽  
First Principles Study ◽  
Electrical And Magnetic Properties ◽  
Expansion Mechanism ◽  
A Site

We investigate electrical and magnetic properties of an A-site-ordered perovskite SrCu3Fe4O12 and clarify its negative thermal expansion mechanism.

scholarly journals Reprobing the mechanism of negative thermal expansion in siliceous faujasite

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 19903-19909 ◽  
Author(s):  
M. P. Attfield ◽  
M. Feygenson ◽  
J. C. Neuefeind ◽  
T. E. Proffen ◽  
T. C. A. Lucas ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Distribution Function ◽  
Neutron Scattering ◽  
Rietveld Refinement ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Negative Thermal Expansion ◽  
Scattering Data ◽  
Total Neutron ◽  
Expansion Mechanism

Combined Rietveld refinement and pair distribution function analysis of total neutron scattering data unveils the finer details of the negative thermal expansion mechanism of siliceous faujasite.

Theoretical study of negative thermal expansion mechanism of ZnF2

2012 ◽  
Vol 47 (5) ◽  
pp. 1113-1118 ◽  
Author(s):  
Lei Wang ◽  
Peng-Fei Yuan ◽  
Fei Wang ◽  
Qiang Sun ◽  
Er-Jun Liang ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Theoretical Study ◽  
Negative Thermal Expansion ◽  
Expansion Mechanism

Polarization- and Strain-Mediated Control of Negative Thermal Expansion and Ferroelasticity in BiInO3–BiZn1/2Ti1/2O3

2021 ◽  
Vol 33 (4) ◽  
pp. 1498-1505
Author(s):  
Takumi Nishikubo ◽  
Takahiro Ogata ◽  
Lalitha Kodumudi Venkataraman ◽  
Daniel Isaia ◽  
Zhao Pan ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion

scholarly journals Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Yongqiang Qiao ◽  
Yuzhu Song ◽  
Andrea Sanson ◽  
Longlong Fan ◽  
Qiang Sun ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Intermetallic Compound ◽  
Cell Volume ◽  
Valence State ◽  
Unit Cell Volume ◽  
Negative Thermal Expansion ◽  
Combined Effect ◽  
Dual Effect ◽  
Valence Transition ◽  
Magnetovolume Effect

AbstractNegative thermal expansion (NTE) is an intriguing property, which is generally triggered by a single NTE mechanism. In this work, an enhanced NTE (αv = −32.9 × 10−6 K−1, ΔT = 175 K) is achieved in YbMn2Ge2 intermetallic compound to be caused by a dual effect of magnetism and valence transition. In YbMn2Ge2, the Mn sublattice that forms the antiferromagnetic structure induces the magnetovolume effect, which contributes to the NTE below the Néel temperature (525 K). Concomitantly, the valence state of Yb increases from 2.40 to 2.82 in the temperature range of 300–700 K, which simultaneously causes the contraction of the unit cell volume due to smaller volume of Yb3+ than that of Yb2+. As a result, such combined effect gives rise to an enhanced NTE. The present study not only sheds light on the peculiar NTE mechanism of YbMn2Ge2, but also indicates the dual effect as a possible promising method to produce enhanced NTE materials.

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