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Title: Crossover of thermal expansion from positive to negative by removing the excess fluorines in cubic ReO3-type TiZrF7-x

Journal Article · · Journal of Materials Chemistry C
DOI:https://doi.org/10.1039/C7TC04875K· OSTI ID:1463853
ORCiD logo [1];  [2];  [2];  [3]; ORCiD logo [1];  [4];  [4];  [5];  [1];  [4];  [4];  [6]
  1. Chinese Academy of Sciences (CAS), Hefei (China). Key Lab. of Materials Physics and Inst. of Solid State Physics; Univ. of Science and Technology of China, Hefei (China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Hefei Univ. of Technology (China). Lab. of Amorphous Materials and School of Materials Science and Engineering
  4. Chinese Academy of Sciences (CAS), Hefei (China). Key Lab. of Materials Physics and Inst. of Solid State Physics
  5. Chinese Academy of Sciences (CAS), Hefei (China). High Magnetic Field Lab.
  6. Chinese Academy of Sciences (CAS), Hefei (China). Key Lab. of Materials Physics, Inst. of Solid State Physics and High Magnetic Field Lab.

Here, we report the crossover of the coefficient of thermal expansion (CTE) from positive to negative by withdrawing the excess fluorines in ReO3-type TiZrF7-x (x = 0, 0.5 and 1) compounds. The average volumetric CTE between 300 K and 623 K changes from 8.07 ppm K-1 for x = 0, to 0.66 ppm K-1 for x = 0.5 and finally to -6.09 ppm K-1 for x = 1. After withdrawing the excess fluorines, the lattice expands and the edge-sharing polyhedra partially transform to corner-sharing ones, which enhances the transverse vibrations of fluorines and thus accounts for the crossover of CTE. Moreover, these compounds are narrow-gap semiconductors with the energy gap decreasing with x. NTE may also be achievable in other fluorine-excess cubic fluorides by removing the excess fluorines, which opens up a new avenue for exploring the NTE in fluorides.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0012704; QYZDB-SSW-SLH015; 51322105; U1632158
OSTI ID:
1463853
Alternate ID(s):
OSTI ID: 1434158
Report Number(s):
BNL-207923-2018-JAAM; JMCCCX
Journal Information:
Journal of Materials Chemistry C, Vol. 6, Issue 19; ISSN 2050-7526
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (3)


Figures / Tables (5)