Correlation between curie temperature and cation radius in the ferroelectric BaFeF<sub>5</sub>family

Ravez, J.; Andriamampianina, V.; Simon, A.; Grannec, J.; Abrahams, S. C.

doi:10.1080/00150199008211386

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…The displacement magnitudes of the symmetryindependent Cr atoms from the centers of their fluorine octahedra allow a transition temperature of 630 (30) K to be predicted (Abrahams, Kurtz & Jamieson, 1968), in satisfactory agreement with experiment (Abrahams, Albertsson, Svensson & Ravez, 1990). PbsCr3Ft9 forms a continuous series of ferro-electric solid solutions with Pb5A13FIg; the transition temperatures of the resulting materials, as measured on heating, decrease smoothly from 555 to 280 K with increasing PbsA13Fw component (Ravez, Simon, Andriamampianina, Grannec, Hagenmuller & Abrahams, 1990;. The phase diagram of the Pbs(Crl-xAlx)3F19 system has been determined, under both heating and cooling conditions, by Ravez, Andriamampianina, Simon, Rabardel, Ihringer & Abrahams (1994).…”

Section: Introductionsupporting

confidence: 71%

Relationship between the structures of ferroelectric Pb₅Cr₃F₁₉ and antiferroelectric Pb₅Al₃F₁₉ at 295 K and the phase III–phase IV transition in Pb₅Al₃F₁₉ on cooling to about 110 K

Andriamampianina¹,

Gravereau²,

Ravez³

et al. 1994

Acta Crystallogr Sect B

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Antiferroelectric phase III of lead aluminium fluoride, PbsAI3Fw, Mr = 1477.9, tetragonal space group P4/n. At T = 295 K, a = 20.1738 (4) and c = 7.2205 (1) A,, V = 2939 (1) A 3, Z = 8, O m = 6.66 (5), Dx = 6.681 Mg m -3. For A(Mo Ka) = 0.71069 A,, /x = 58.0 mm-~, F(000) = 4960. The structure was determined from 18502 (1276 independent) Fm 2> -3~r(F~) with (sin 0)/,~ -< 0.703 A,-~ Least-squares refinement on wF~ resulted in R(Fm)= 0.0579 with Rint(Fm) = 0.048. PbsA13F19 undergoes a first-order phase transition from antiferroelectric to ferroelectric at about 110 K, with a wide thermal hysteresis.Transformation of the atomic coordinates of ferroelectric PbsCr3Fi9 previously measured at 295 K and comparison with those of antiferroelectric Pb5AI3FI9 at 295 K reveal differences between related atomic positions that range from 0.10 to 1.56 A. The origin of the first-order transition from the antiferroelectric phase III to ferroelectric phase IV in PbsAI3FI9 is shown to be associated with the orientational change from an eclipsed arrangement of A1F6 octahedra along the inversion and rotation-tetrad axes in phase III to a staggered arrangement along the rotationtetrad axes in phase IV.

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Section: Introductionsupporting

confidence: 71%

Relationship between the structures of ferroelectric Pb₅Cr₃F₁₉ and antiferroelectric Pb₅Al₃F₁₉ at 295 K and the phase III–phase IV transition in Pb₅Al₃F₁₉ on cooling to about 110 K

Andriamampianina¹,

Gravereau²,

Ravez³

et al. 1994

Acta Crystallogr Sect B

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“…x12.1. The X-ray powder pattern intensity distributions are similar in both cases, with the solid solution formation of Pb 5 (Cr 1 À x Al x ) 3 F 19 over the full composition range 0 x 1 (Ravez et al, 1990) providing strong indications early in this study that phase II of Pb 5 Cr 3 F 19 and phase V of Pb 5 Al 3 F 19 are likely to be isostructural, but see x14.2. The atomic coordinates of phase V at 160 K (Sarraute et al, 1996) are given in Table S1 3 with views of the structure along the c and a axes in Figs.…”

Section: Structural Characteristicssupporting

confidence: 61%

Structure–property correlation over five phases and four transitions in Pb₅Al₃F₁₉

Abrahams

Ravez

Ritter

et al. 2003

Acta Crystallogr B Struct Sci

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The calorimetric and dielectric properties of Pb(5)Al(3)F(19) in the five phases stable under ambient pressure are correlated with structure for fuller characterization of each phase. The first-order transition between ferroelectric phase V and antiferroelectric phase IV at T(V,IV) = 260 (5) K exhibits a thermal hysteresis of 135 (5) K on heating, with a maximum atomic displacement Delta(xyz)(max) = 1.21 (6) A; the transition from phase IV to ferroelastic phase III at 315 (5) K is also first order but with a thermal hysteresis of 10 (5) K and Delta(xyz)(max) = 0.92 (7) A; that from phase III to paraelastic phase II at 360 (5) K is second order without hysteresis and has Delta(xyz)(max) = 0.69 (4) A; and the transition from phase II to paraelectric phase I at 670 (5) K is second or higher order, with Delta(xyz)(max) = 0.7 (4) A. The measured entropy change DeltaS at T(V,IV) agrees well with DeltaS as derived from the increased configurational energy by Stirling's approximation. For all other phase transitions, 0.5 > or = DeltaS > 0 J mol(-1) K(-1) is consistent with an entropy change caused primarily by the changes in the vibrational energy. The structure of phase III is determined both by group theoretical/normal mode analysis and by consideration of the structures of phases II, IV and V reported previously; refinement is by simultaneous Rietveld analysis of the X-ray and neutron diffraction powder profiles. The structure of prototypic phase I is predicted on the basis of the atomic arrangement in phases II, III, IV and V. The introduction of 3d electrons into the Pb(5)Al(3)F(19) lattice disturbs the structural equilibrium, the addition of 0.04% Cr(3+) causing significant changes in atomic positions and increasing T(IV,III) by approximately 15 K. Substitution of Al(3+) by 20% or more Cr(3+) eliminates the potential minima that otherwise stabilize phases IV, III and II.

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“…Abrahams et al (1981) have identified nine members of the ferroelectric SrAlF 5 family, of which as many as eight are probably multiferroic (Ti, V, Cr or Fe at the B site; Sr or Ba at the A site). Ravez et al (1990b) further examined the relationship between T C and cation radii in this group. LeBail and Mercier (1995) have shown that BaFeF 5 has at least four phases: α-BaFeF 5 is P2 1 with Z = 4; β-BaFeF 5 is P4 with Z = 32; and γ -BaFeF5 is P2 1 /n with Z = 8.…”

Section: 23mentioning

confidence: 99%

“…This family has received the most attention in the past three years. Initially discovered to be multiferroic below 122 K by Ravez et al (1989Ravez et al ( , 1990aRavez et al ( , 1990b, Ravez (1997) and Ishihara et al (1993Ishihara et al ( , 1994, it has been analyzed via dielectric studies (Blinc et al 2008), polaron studies (Levstik et al 2008(Levstik et al , 2009, magnetic resonance (Blinc et al 2009a) and muon spectroscopy (Potocnik et al 2010). In addition to its Néel temperature at 122 K, it has a structural transition at 290 K (Ishihara et al 1993(Ishihara et al , 1994.…”

Section: 23mentioning

confidence: 99%

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Scott

Blinc

2011

J. Phys.: Condens. Matter

108

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Correlation between curie temperature and cation radius in the ferroelectric BaFeF₅family

Cited by 7 publications

References 4 publications

Relationship between the structures of ferroelectric Pb₅Cr₃F₁₉ and antiferroelectric Pb₅Al₃F₁₉ at 295 K and the phase III–phase IV transition in Pb₅Al₃F₁₉ on cooling to about 110 K

Relationship between the structures of ferroelectric Pb₅Cr₃F₁₉ and antiferroelectric Pb₅Al₃F₁₉ at 295 K and the phase III–phase IV transition in Pb₅Al₃F₁₉ on cooling to about 110 K

Structure–property correlation over five phases and four transitions in Pb₅Al₃F₁₉

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

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Correlation between curie temperature and cation radius in the ferroelectric BaFeF5family

Cited by 7 publications

References 4 publications

Relationship between the structures of ferroelectric Pb5Cr3F19 and antiferroelectric Pb5Al3F19 at 295 K and the phase III–phase IV transition in Pb5Al3F19 on cooling to about 110 K

Relationship between the structures of ferroelectric Pb5Cr3F19 and antiferroelectric Pb5Al3F19 at 295 K and the phase III–phase IV transition in Pb5Al3F19 on cooling to about 110 K

Structure–property correlation over five phases and four transitions in Pb5Al3F19

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

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Correlation between curie temperature and cation radius in the ferroelectric BaFeF₅family

Relationship between the structures of ferroelectric Pb₅Cr₃F₁₉ and antiferroelectric Pb₅Al₃F₁₉ at 295 K and the phase III–phase IV transition in Pb₅Al₃F₁₉ on cooling to about 110 K

Relationship between the structures of ferroelectric Pb₅Cr₃F₁₉ and antiferroelectric Pb₅Al₃F₁₉ at 295 K and the phase III–phase IV transition in Pb₅Al₃F₁₉ on cooling to about 110 K

Structure–property correlation over five phases and four transitions in Pb₅Al₃F₁₉