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Title: Synthesis of Defect Perovskites (He2–xx)(CaZr)F6 by Inserting Helium into the Negative Thermal Expansion Material CaZrF6

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b07860· OSTI ID:1399917

Defect perovskites (He2–xx)(CaZr)F6 can be prepared by inserting helium into CaZrF6 at high pressure. They can be recovered to ambient pressure at low temperature. There are no prior examples of perovskites with noble gases on the A-sites. The insertion of helium gas into CaZrF6 both elastically stiffens the material and reduces the magnitude of its negative thermal expansion. It also suppresses the onset of structural disorder, which is seen on compression in other media. Measurements of the gas released on warming to room temperature and Rietveld analyses of neutron diffraction data at low temperature indicate that exposure to helium gas at 500 MPa leads to a stoichiometry close to (He11)(CaZr)F6. Helium has a much higher solubility in CaZrF6 than silica glass or crystobalite. An analogue with composition (H2)2(CaZr)F6 would have a volumetric hydrogen storage capacity greater than current US DOE targets. We anticipate that other hybrid perovskites with small neutral molecules on the A-site can also be prepared and that they will display a rich structural chemistry.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1399917
Journal Information:
Journal of the American Chemical Society, Vol. 139, Issue 38; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (27)

Group-Theoretical Analysis of Octahedral Tilting in Perovskites journal December 1998
Simple ways of determining perovskite structures journal November 1975
The classification of tilted octahedra in perovskites journal November 1972
Structures and phase transitions in perovskites - a group-theoretical approach journal December 2004
Perovskites with the Framework-Forming Xenon journal October 2015
Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites journal October 2012
Thermally Stable N 2 -Intercalated WO 3 Photoanodes for Water Oxidation journal October 2012
Thermochemistry of a New Class of Materials Containing Dinitrogen Pairs in an Oxide Matrix journal June 2005
Large Negative Thermal Expansion and Anomalous Behavior on Compression in Cubic ReO 3 -Type A II B IV F 6 : CaZrF 6 and CaHfF 6 journal May 2015
Tungsten Oxide Clathrates for Water Oxidation: A First Principles Study journal October 2012
Pronounced Negative Thermal Expansion from a Simple Structure: Cubic ScF 3 journal November 2010
Composition, Response to Pressure, and Negative Thermal Expansion in M II B IV F 6 (M = Ca, Mg; B = Zr, Nb) journal January 2017
Atomic Linkage Flexibility Tuned Isotropic Negative, Zero, and Positive Thermal Expansion in MZrF 6 (M = Ca, Mn, Fe, Co, Ni, and Zn) journal October 2016
Reducing the background from pressure vessels using a BRIM journal August 2011
Pressure-Induced Volume Expansion of Zeolites in the Natrolite Family journal May 2002
Neon-Bearing Ammonium Metal Formates: Formation and Behaviour under Pressure journal September 2016
Deactivation of Pressure-Induced Amorphization in Silicalite SiO 2 by Insertion of Guest Species journal June 2010
Tunable thermal expansion in framework materials through redox intercalation journal February 2017
Room-temperature compressibility of C 60 : Intercalation effects with He, Ne, and Ar journal May 1995
Compressed Arsenolite As 4 O 6 and Its Helium Clathrate As 4 O 6 ·2He journal June 2015
High-pressure behavior of a Si O 2 clathrate observed by using various pressure media journal May 2007
Helium penetrates into silica glass and reduces its compressibility journal June 2011
Effect of helium on structure and compression behavior of SiO2 glass journal March 2011
Anomalous behavior of cristobalite in helium under high pressure journal September 2012
Hydrogen Solubility in Amorphous Silica at Pressures up to 75 kbar journal December 2012
Hydrogen Solubility in Cristobalite at High Pressure journal October 2014
Temperature-regulated guest admission and release in microporous materials journal June 2017

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Guest-dependent negative thermal expansion in a lanthanide-based metal–organic framework journal January 2019
Strongly coloured thiocyanate frameworks with perovskite-analogue structures journal January 2019
Disorder–order transitions in the perovskite metal–organic frameworks $[(CH_{3})_{2}NH_{2} ][M(HCOO)_{3}]$ at high pressure text January 2018
High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12) journal October 2018