An investigation on the structural evolution of Pb2YbTaO6

Sciau, Ph.; Lampis, Nathascia; Geddo-Lehmann, A.

doi:10.1016/s0038-1098(00)00314-8

Cited by 10 publications

(3 citation statements)

References 14 publications

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“…Finally, it has to be noticed that these models of Pb displacement are very similar to those reported in lead based perovskites such as PbZrO 3 [42,43] or other B-site ordered perovskite Pb 2 YbNbO 6 [44], Pb 2 YbTaO 6 [45] or Pb 2 MgWO 6 [46]. As for these complex perovskites, our TEM observations show clearly the correlation between Sc 3+ /Nb 5+ chemical ordering and the extra ordering of Pb cations.…”

Section: H +supporting

confidence: 83%

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc_1/2Nb_1/2)O₃relaxor

Perrin

Menguy

Bidault

et al. 2001

J. Phys.: Condens. Matter

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The influence of chemical B-site ordering between Sc 3+ and Nb 5+ cations on the properties of the Pb(Sc 1/2 Nb 1/2)O 3 (PSN) relaxor has been investigated. Depending of the degree of ordering, PSN exhibits different behaviours. For a completely disordered material, a relaxor-ferroelectric phase transition is observed at 379 K by DSC. Ordering between Sc 3+ and Nb 5+ cations on the B-site of the perovskite structure leads to a non-homogeneous material constituted of two phases: ordered and disordered phases. The phase transition temperature of the ordered phase is confirmed to be lower (346 K) than that of the disordered phase. It appears that the phase transition of the disordered phase is shifted to lower temperature owing to the presence of the ordered phase. Moreover, an additional short-range structural ordering is shown to exist in disordered PSN. This additional ordering, for which antiparallel displacements of Pb atoms could be involved, is favoured by chemical ordering between Sc 3+ and Nb 5+ and is long range in ordered PSN.

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Section: H +supporting

confidence: 83%

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc_1/2Nb_1/2)O₃relaxor

Perrin

Menguy

Bidault

et al. 2001

J. Phys.: Condens. Matter

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“…Some members of the Pb 2 B′ 3+ B′′ 5+ O 6 family present really interesting physical properties: Lead ytterbium tantalate Pb 2 YbTaO 6 is an antiferroelectric similar to Pb 2 YbNbO 6 and Pb 2 HoNbO 6 perovskites . The room temperature (RT) phase symmetry is interpreted as an orthorhombically distorted ABO 3 -type subcell, and the space group for both antiferroelectric (AFE) and ferroelectric (FE) phases is considered to be Pbnm . − It has also been observed that the specimen shows weak relaxor behavior at the AFE−FE phase transition, and the existence of nanopolar regions is assumed to be the responsible factor for the relaxor behavior …”

Section: Introductionmentioning

confidence: 99%

“…16 The room temperature (RT) phase symmetry is interpreted as an orthorhombically distorted ABO 3type subcell, and the space group for both antiferroelectric (AFE) and ferroelectric (FE) phases is considered to be Pbnm. [17][18][19][20] It has also been observed that the specimen shows weak relaxor behavior at the AFE-FE phase transition, and the existence of nanopolar regions is assumed to be the responsible factor for the relaxor behavior. 21 In the present work, we have prepared, for the first time, and characterized a new member of the Pb 2 B 3+ B 5+ O 6 family, the Pb 2 TmSbO 6 perovskite.…”

Section: Introductionmentioning

confidence: 99%

An Original Polymorph Sequence in the High-Temperature Evolution of the Perovskite Pb₂TmSbO₆

et al. 2010

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The synthesis, crystal structure, and dielectric properties of the novel double perovskite Pb(2)TmSbO(6) are described. The room-temperature crystal structure was determined by ab initio procedures from neutron powder diffraction (NPD) and synchrotron X-ray powder diffraction (SXRPD) data in the monoclinic C2/c (No. 15) space group. This double perovskite contains a completely ordered array of alternating TmO(6) and SbO(6) octahedra sharing corners, tilted in antiphase along the three pseudocubic axes, with an a(-)b(-)b(-) tilting scheme, which is very unusual in the crystallochemistry of perovskites. The lead atoms occupy a highly asymmetric void with 8-fold coordination due to the stereoactivity of the Pb(2+) lone electron pair. This compound presents three successive phase transitions in a narrow temperature range (at T1 = 385 K, T2 = 444 K, and T3 = 460 K in the heating run) as shown by differential scanning calorimetry (DSC) data. The crystal structure and temperature-dependent NPD follow the space-group sequence C2/c → P2(1)/n → R3 → Fm3m. This is a novel polymorph succession in the high-temperature evolution of perovskite-type oxides. The Tm/Sb long-range ordering is preserved across the consecutive phase transitions. Dielectric permittivity measurements indicate the presence of a paraelectric/antiferroelectric transition (associated with the last structural transition), as suggested by the negative Curie temperature obtained from the Curie-Weiss fit of the reciprocal permittivity.

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Van Vleck paramagnetism in lead ytterbium niobate and tantalate single crystals

Talik

Szubka

Kulpa

et al. 2011

Journal of Crystal Growth

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An investigation on the structural evolution of Pb2YbTaO6

Cited by 10 publications

References 14 publications

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc_1/2Nb_1/2)O₃relaxor

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc_1/2Nb_1/2)O₃relaxor

An Original Polymorph Sequence in the High-Temperature Evolution of the Perovskite Pb₂TmSbO₆

Van Vleck paramagnetism in lead ytterbium niobate and tantalate single crystals

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An investigation on the structural evolution of Pb2YbTaO6

Cited by 10 publications

References 14 publications

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc1/2Nb1/2)O3relaxor

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc1/2Nb1/2)O3relaxor

An Original Polymorph Sequence in the High-Temperature Evolution of the Perovskite Pb2TmSbO6

Van Vleck paramagnetism in lead ytterbium niobate and tantalate single crystals

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Influence of B-site chemical ordering on the dielectric response of the Pb(Sc_1/2Nb_1/2)O₃relaxor

Influence of B-site chemical ordering on the dielectric response of the Pb(Sc_1/2Nb_1/2)O₃relaxor

An Original Polymorph Sequence in the High-Temperature Evolution of the Perovskite Pb₂TmSbO₆