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dc.contributor.authorJones, S. P. P.
dc.contributor.authorEvans, D. M.
dc.contributor.authorCarpenter, M. A.
dc.contributor.authorRedfern, S. A. T.
dc.contributor.authorScott, J. F.
dc.contributor.authorStraube, U.
dc.contributor.authorSchmidt, V. Hugo
dc.date.accessioned2016-04-19T17:20:30Z
dc.date.available2016-04-19T17:20:30Z
dc.date.issued2011-03-04
dc.identifier.citationS.P.P. Jones, D.M. Evans, M.A. Carpenter, S.A.T. Redfern, J.F. Scott, U. Straube, and V.H. Schmidt, “Phase diagram and phase transitions in ferroelectric tris-sarcosine calcium chloride and its brominated isomorphs,” Phys. Rev. B 83, 094102 (2011).en_US
dc.identifier.issn1098-0121
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/9717
dc.description.abstractTris-sarcosine calcium chloride [(TSCC), (CH3NHCH2COOH)3CaCl2] is a uniaxial ferroelectric (FE) with a displacive second-order phase transition near Tc=130 K. A continuous range of solid solutions can be made by substituting Br for Cl, which lowers Tc to 0 K at ∼72% Br. Such a quantum critical point differs from that in pseudocubic FEs, such as O-18 SrTiO3 or doped KTaO3. For many years, this system was thought to have only two phases, paraelectric and FE, at ambient pressure. However, we find from dielectric and resonant ultrasound spectroscopy that there are four phase transitions in TSCC and in TSCC:Br (for 0 < Br < 40%): Order-disorder of the sarcosine methyl group at 185 K; displacive FE transition at 130 K (in pure TSCC); a second FE transition [previously hypothesized to be antiferroelectric (AFE) but probably not] at 64 K; and a new anomaly at ∼45 K which might be due to a phase transition or to Debye-like freezing of orientational disorder of some part of the sarcosine molecule. The probable sequence of structures is (upon cooling): Pnma with Z=4(D162h) ambient 500 K > T > 185 K, disordered; Pnma with Z=4(D162h)185 K>T>130 K (ordered); Pn21a with Z=4(C92v)130 K>T>64 K (FE); P21a (C52h) with Z =4, 64 K > T > 45 K (not AFE); T < 45 K, unknown structure. A sixth hexagonal structure at high temperatures (>500 K) is hypothesized to be D36h(P63/mcm) with Z =2, but the samples decompose first at 503 K (230 °C).en_US
dc.titlePhase diagram and phase transitions in ferroelectric tris-sarcosine calcium chloride and its brominated isomorphsen_US
dc.typeArticleen_US
mus.citation.extentfirstpage94102en_US
mus.citation.issue9en_US
mus.citation.journaltitlePhysical Review Ben_US
mus.citation.volume83en_US
mus.identifier.categoryChemical & Material Sciencesen_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.identifier.doi10.1103/PhysRevB.83.094102en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentPhysics.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.data.thumbpage3en_US


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