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Title: Landau theory and giant room-temperature barocaloric effect in M F 3 metal trifluorides

Journal Article · · Physical Review Materials
 [1];  [2];  [3];  [1]
  1. Univ. of Costa Rica, San Jose (Costa Rica)
  2. Yale Univ., New Haven, CT (United States)
  3. Univ. of Chicago, IL (United States)

The structural phase transitions of MF3 (M = Al, Cr, V, Fe, Ti, Sc) metal trifluorides are studied within a simple Landau theory consisting of tilts of rigid MF6 octahedra associated with soft antiferrodistortive optic modes that are coupled to long-wavelength strain generating acoustic phonons. We calculate the temperature and pressure dependence of several quantities such as the spontaneous distortions, volume expansion, and shear strains as well as T - P phase diagrams. By contrasting our model to experiments we quantify the deviations from mean-field behavior and find that the tilt fluctuations of the MF6 octahedra increase with metal cation size. We apply our model to predict giant barocaloric effects in Sc-substituted TiF3 of up to about 15 JK-1 kg-1 for modest hydrostatic compressions of 0.2GPa. The effect extends over a wide temperature range of over 140K (including room temperature) due to a large predicted rate, dTc/dP = 723K GPa-1, which exceeds those of typical barocaloric materials. Our results suggest that open lattice frameworks such as the trifluorides are an attractive platform to search for giant barocaloric effects.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1411962
Alternate ID(s):
OSTI ID: 1399808
Journal Information:
Physical Review Materials, Vol. 1, Issue 5; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (4)

Room-temperature mechanocaloric effects in lithium-based superionic materials journal August 2018
Polymorphism in M(H 2 PO 2 ) 3 (M = V, Al, Ga) compounds with the perovskite-related ReO 3 structure journal January 2019
Negative Thermal Expansion Near the Precipice of Structural Stability in Open Perovskites journal November 2018
Negative thermal expansion near the precipice of structural stability in open perovskites text January 2018

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