A New Bi4Mn1/3W2/3O8Cl Sillen—Aurivillius Intergrowth: Synthesis and Structural Characterization by Quantitative Transmission Electron Microscopy.

Ávila‐Brande, David; Otero-Dı́az, L.C.; Landa-Cánovas, A.R.; Bals, Sara; Tendeloo, Gustaaf Van

doi:10.1002/chin.200631031

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“…The Dion–Jacobson phases have the formula [ M + ]–[ A n –1 B n O 3 n +1 ], where M is an alkali metal and the displacement of the perovskite slabs is either (1/2, 0) or (0, 0), depending on the alkali metal: for example KLaNb 2 O 7 . The Sillén–Aurivillius phases have the general Aurivillius formula [Bi 2 O 2 ]-[ A n –1 B n O 3n+1 ], with a fluorite [Bi 2 O 2 ] 2+ layer and perovskite layers offset by a (1/2, 1/2) translation, with the possible Sillén addition of halide ion sheets supplementing the [Bi 2 O 2 ] 2+ sheets. For example, SrBiTaO 9 , Bi 3 TiNbO 9 , etc.…”

Section: Introductionmentioning

confidence: 99%

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Glasser

2017

Inorg. Chem.

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Perovskite, CaTiO, is the prototype of an extensive group of materials. They are capable of considerable chemical modification, with the further capability of undergoing structural modification by the intercalation of thin sheets of intrusive materials (both inorganic and organic) between the cubic perovskite layers, to form a range of "layered" perovskites. These changes bring about alterations in their electronic, structural, and other properties, permitting some "tuning" toward specific ends. This paper collects the limited known thermodynamic data for layered perovskites of various chemical compositions and demonstrates by example that the thermodynamic layer values are substantially additive. This additivity may be exploited by summing properties of the constituent oxides, by adding differences between adjacent compositions within a series, or even by substitution of oxides for one another, thus permitting prediction beyond the known range of compositions. Strict additivity implies full reversibility so that the additive product may be unstable and may undergo structural changes, producing materials with new and potentially useful properties such as ferroelectricity, polarity, giant magnetoresistance, and superconductivity.

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Section: Introductionmentioning

confidence: 99%

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Glasser

2017

Inorg. Chem.

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“…The series can be described as [Bi 2 O 2 ] [ A n –1 B n O 3 n +1 ] [Bi 2 O 2 ] [ X m ] where n is the number of perovskite layers ( A ), and m the number of halide layers ( X ); abbreviated to AnXm . Potential for transition metal doping into the perovskite layers have been demonstrated by earlier researchers on A 1 X 1-type phases , with Avila-Brande achieving up to 1 / 3 magnetic transition metal substitution into the single perovskite layer. These types of compounds have also been shown to adopt non-centrosymmetric space groups exhibiting ferroelectric properties. , …”

Section: Introductionmentioning

confidence: 99%

Sillen–Aurivillius Intergrowth Phases as Templates for Naturally Layered Multiferroics

et al. 2012

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The ferroelectric Sillen-Aurivillius phase Bi 5 PbTi 3 O 14 Cl, a layered structure containing three-layer perovskite-type blocks, has been modified by substituting magnetic transition metal cations M 3+ = Cr 3+ , Mn 3+ or Fe 3+ for 1 3 of the Ti 4+ cations, accompanied by co-doping of Bi 3+ for Pb 2+ . The aim of the modification was to produce naturally-layered ferroelectromagnetic compounds. Rietveld refinements against high-temperature synchrotron X-ray powder diffraction data show that the resulting new compounds Bi 6 Ti 2 MO 14 Cl undergo noncentrosymmetric (P2an) to centrosymmetric (P4/mmm) ferroelectric phase transitions for Bi 6 Ti 2 CrO 14 Cl at 974.6(2) K, Bi 6 Ti 2 MnO 14 Cl at 913.5(6) K, and Bi 6 Ti 2 FeO 14 Cl at 1044.8(1) K. Ferroelectric properties were measured on Bi 6 Ti 2 FeO 14 Cl using piezoresponse force microscopy which showed typical ferroelectric hysteresis behaviour in the polarisation with varying field strength as well as a piezoelectric strain. Combined Rietveld refinements against X-ray and neutron powder diffraction data indicate a statistical 1:2 distribution of M 3+ and Ti 4+ across all three perovskite layers, resulting in highly strained structures (enhancing the ferroelectricity compared to Bi 5 PbTi 3 O 14 Cl) and pronounced spin-glass (cluster glass-type) behaviour below T irr (0) = 4.46 K that we have characterised by detailed magnetic susceptibility and heat capacity measurements.

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A New Bi₄Mn_1/3W_2/3O₈Cl Sillen—Aurivillius Intergrowth: Synthesis and Structural Characterization by Quantitative Transmission Electron Microscopy.

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Cited by 2 publications

References 1 publication

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Sillen–Aurivillius Intergrowth Phases as Templates for Naturally Layered Multiferroics

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