Structural transformation in inverse-perovskite REPt3B (RE = Sm and Gd–Tm) associated with large volume reduction

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dc.contributor.authorMondal, Sen_AU
dc.contributor.authorMazumdar, Cen_AU
dc.contributor.authorRanganathan, Ren_AU
dc.contributor.authorAvdeev, Men_AU
dc.date.accessioned2021-06-03T06:24:25Zen_AU
dc.date.available2021-06-03T06:24:25Zen_AU
dc.date.issued2017-07-05en_AU
dc.date.statistics2021-04-26en_AU
dc.description.abstractIn this work, we report the structural phase transformation of tetragonal inverse-perovskite REPt3B (RE = Sm, and Gd–Tm) compounds to cubic perovskite structure, with a large volume reduction of about 9% (reduction of the c axis, ∼17%; increase in the a axis, ∼5%). The structural stability of the cubic phase, however, could only be maintained by lowering the lattice parameter of the off-stoichiometric REPt3Bx (x < 1), formed in the process of annealing. The combined effect of phase transformation and stoichiometric defects is argued to be responsible for the observed volume collapse. Unexpectedly, the application of a large hydrostatic pressure of ∼20 GPa does not have any significant effect on the crystal structure. Neutron diffraction studies and heat capacity measurements unambiguously confirm different magnetic transition temperatures in the tetragonal and cubic phases. The different physical properties of these two phases demonstrate the interrelationship between the crystal chemistry and the physics of the system. The synthetic route to cubic REPt3Bx identified in this work may be utilized to prepare new ternary rare-earth intermetallics in a cubic perovksite form, which was previously found to facilitate unconventional superconductivity. © 2017 American Chemical Societyen_AU
dc.identifier.citationMondal, S., Mazumdar, C., Ranganathan, R., & Avdeev, M. (2017). Structural transformation in inverse-perovskite REPt3B (RE = Sm and Gd–Tm) associated with large volume reduction. Inorganic Chemistry, 56(14), 8446-8453. doi:10.1021/acs.inorgchem.7b01131en_AU
dc.identifier.issn1520-510Xen_AU
dc.identifier.issue14en_AU
dc.identifier.journaltitleInorganic Chemistryen_AU
dc.identifier.pagination8446-8453en_AU
dc.identifier.urihttps://doi.org/10.1021/acs.inorgchem.7b01131en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10820en_AU
dc.identifier.volume56en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectCrystal latticesen_AU
dc.subjectBoronen_AU
dc.subjectPhase transformationsen_AU
dc.subjectPerovskitesen_AU
dc.subjectPhysical propertiesen_AU
dc.subjectChemical propertiesen_AU
dc.titleStructural transformation in inverse-perovskite REPt3B (RE = Sm and Gd–Tm) associated with large volume reductionen_AU
dc.typeJournal Articleen_AU
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