Strong Covalent Bonding for Enhanced Negative Thermal Expansion in (1 – x)PbTiO3–xBiGaO3

2020 ◽  
Vol 124 (37) ◽  
pp. 20445-20449 ◽  
Author(s):  
Tao Yang ◽  
Yilin Wang ◽  
Longlong Fan ◽  
Na Wang ◽  
Kun Lin ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Covalent Bonding ◽  
Strong Covalent Bonding

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.

Nanoparticle Superlattices with Negative Thermal Expansion (NTE) Coefficients

2021 ◽  
Author(s):  
Hyeong Jin Kim ◽  
Wenjie Wang ◽  
Surya Mallapragada ◽  
Alex Travesset ◽  
David Vaknin
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Nanoparticle Superlattices

Magnetoelastic coupling, negative thermal expansion, and two-dimensional magnetic excitations in FeAs

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
J. L. Niedziela ◽  
L. D. Sanjeewa ◽  
A. A. Podlesnyak ◽  
L. DeBeer-Schmitt ◽  
S. J. Kuhn ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Two Dimensional ◽  
Magnetic Excitations ◽  
Magnetoelastic Coupling

scholarly journals Energy transfer triggered multicolor emissions in Tb3+/Eu3+-coacitivated Y2Mo3O12 negative thermal expansion micropartices for dual-channel tunable luminescent thermometer

2021 ◽  
Author(s):  
Peng Du ◽  
Laihui Luo ◽  
Yafei Hou ◽  
Weiping Li
Keyword(s):  
Thermal Expansion ◽  
Energy Transfer ◽  
Negative Thermal Expansion ◽  
Thermal Quenching ◽  
High Quality ◽  
Dual Channel ◽  
Color Tunable ◽  
Rational Control

Rational control of thermal quenching performance is crucial for achieving high quality luminescent thermometer. Herein, we report the Tb3+/Yb3+-coactivated Y2Mo3O12 (YMO) negative thermal expansion (NTE) microparticles with color-tunable emissions. Irradiated...

Intrinsic Volumetric Negative Thermal Expansion in the “Rigid” Calcium Squarate

2021 ◽  
Author(s):  
Zhanning Liu ◽  
Zhe Wang ◽  
Daofeng Sun ◽  
Xianran Xing
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Rigid Framework

The calcium squarate with a rigid framework is found to exhibit volumetric negative thermal expansion (NTE) with the coefficient -9.51(5) × 10-6 K-1 and uniaxial zero thermal expansion (ZTE, -0.14(4)...

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