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Title: New insights into the negative thermal expansion: Direct experimental evidence for the “guitar-string” effect in cubic ScF3

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.6b02370· OSTI ID:1340686
 [1];  [1];  [2];  [3];  [4];  [4];  [5];  [1];  [1];  [1]
  1. Univ. of Science and Technology Beijing, Beijing (China)
  2. Univ. of Padova, Padova (Italy)
  3. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  4. Elettra Synchrotron, Triestre (Italy)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)

The understanding of the negative thermal expansion (NTE) mechanism remains challenging but critical for the development of NTE materials. This study sheds light on NTE of ScF3, one of the most outstanding materials with NTE. The local dynamics of ScF3 has been investigated by a combined analysis of synchrotron-based X-ray total scattering, ex-tended X-ray absorption fine structure and neutron powder diffraction. Very interestingly, we observe that i) the Sc-F nearest-neighbor distance strongly expands with increasing temperature while the Sc-Sc next-nearest-neighbor distance contracts, ii) the thermal ellipsoids of relative vibrations be-tween Sc-F nearest-neighbors are highly elongated in the direction perpendicular to the Sc-F bond, indicating that the Sc-F bond is much softer to bend than to stretch, and iii) there is mainly dynamically transverse motion of fluorine atoms, rather than static shifts. Here, these results are the direct experimental evidence for the NTE mechanism, in which the rigid unit is not necessary for the occurrence of NTE, and the key role is played by the transverse thermal vibrations of fluorine atoms through the “guitar-string” effect.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1340686
Journal Information:
Journal of the American Chemical Society, Vol. 138, Issue 27; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 99 works
Citation information provided by
Web of Science

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Cited By (21)

Group 3 metal trihalide complexes with neutral N-donor ligands – exploring their affinity towards fluoride journal January 2018
Spring-like motion caused large anisotropic thermal expansion in nonporous M(eim) 2 (M = Zn, Cd) journal January 2017
Crossover of thermal expansion from positive to negative by removing the excess fluorines in cubic ReO 3 -type TiZrF 7−x journal January 2018
Structural, vibrational and thermal expansion properties of Sc 2 W 4 O 15 journal January 2018
Negative thermal expansion behavior in M Zr F 6 ( M = Ca , Mg , Sr ) : Ab initio lattice dynamical studies journal July 2018
Infrared lattice dynamics in negative thermal expansion material in single-crystal ScF 3 journal October 2019
Transverse vibration driven large uniaxial negative and zero thermal expansion in boron bridged REPt 3 B framework materials journal January 2018
Negative thermal expansion in (Sc,Ti)Fe 2 induced by an unconventional magnetovolume effect journal January 2020
Enhanced tetragonality and large negative thermal expansion in a new Pb/Bi-based perovskite ferroelectric of (1 − x )PbTiO 3x Bi(Zn 1/2 V 1/2 )O 3 journal January 2019
Entropic elasticity and negative thermal expansion in a simple cubic crystal journal November 2019
Cone-spiral magnetic ordering dominated lattice distortion and giant negative thermal expansion in Fe-doped MnNiGe compounds journal January 2020
Negative thermal expansion near two structural quantum phase transitions journal December 2017
Negative thermal expansion in molecular materials journal January 2018
Synthesis, structure, and polymorphic transitions of praseodymium( iii ) and neodymium( iii ) borohydride, Pr(BH 4 ) 3 and Nd(BH 4 ) 3 journal January 2018
Strong negative thermal expansion in the hexagonal polymorph of ScF 3 journal January 2018
Perovskite-related ReO3-type structures journal January 2020
Negative thermal expansion in cubic FeFe(CN) 6 Prussian blue analogues journal January 2019
First-principles study of phonon anharmonicity and negative thermal expansion in ScF 3 journal March 2019
Inorganic–organic hybridization induced uniaxial zero thermal expansion in MC 4 O 4 (M = Ba, Pb) journal January 2019
Tunable thermal expansion in framework materials through redox intercalation journal February 2017
Entropic elasticity and negative thermal expansion in a simple cubic crystal text January 2019

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