scholarly journals Electronic origin of negative thermal expansion in V2OPO4

2020 ◽  
Vol 56 (48) ◽  
pp. 6523-6526 ◽  
Author(s):  
Elise Pachoud ◽  
James Cumby ◽  
Jon Wright ◽  
Branimir Raguž ◽  
Robert Glaum ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Charge Ordering ◽  
Phase Coexistence ◽  
Ordering Transition

Unusual negative thermal expansion in V2OPO4 is discovered to arise from phase coexistence around the charge ordering transition at 605 K.

Exploring the charge-ordering transition in via thermal expansion measurements

2010 ◽  
Vol 405 (11) ◽  
pp. S92-S94 ◽  
Author(s):  
Mariano de Souza ◽  
Daniel Hofmann ◽  
Pascale Foury-Leylekian ◽  
Alec Moradpour ◽  
Jean-Paul Pouget ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Charge Ordering ◽  
Ordering Transition

scholarly journals Negative Thermal Expansion in (Hf,Ti)Fe2 Induced by the Ferromagnetic and Antiferromagnetic Phase Coexistence

2019 ◽  
Vol 58 (9) ◽  
pp. 5380-5383 ◽  
Author(s):  
Yongqiang Qiao ◽  
Yuzhu Song ◽  
Kun Lin ◽  
Xinzhi Liu ◽  
Alexandra Franz ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Phase Coexistence ◽  
Antiferromagnetic Phase

Phase coexistence in the charge ordering transition in CaMn7O12

2002 ◽  
Vol 14 (23) ◽  
pp. 5747-5753 ◽  
Author(s):  
R Przenioslo ◽  
I Sosnowska ◽  
E Suard ◽  
A Hewat ◽  
A N Fitch
Keyword(s):  
Charge Ordering ◽  
Phase Coexistence ◽  
Ordering Transition

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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