Manifestation of the Ferroelectric Phase Transition in the Mössbauer Parameters of the System (SnxPb1−x)2P2S6

Baltrūnas, D.; Mikaitis, R.; Slivka, V. Yu.; Vysochanskiǐ, Yu. M.

doi:10.1002/pssa.2211190109

Cited by 8 publications

(9 citation statements)

References 6 publications

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“…Observed location of TCPs at same temperature level ("temperature waterline") for different mechanical or chemical impacts (at compression of Sn 2 P 2 S 6 and at S by Se or Sn by Pb substitution) (figure 12) could be explained by the following way. At sulfur by selenium replacement, the intercell interactions become weaker in result of more covalent chemical bonds [23,24], but the Sn 2+ cations stereoactivity and shape of the local potential obviously remain almost unchanged. These factors, mostly the intercell interactions weakening, determine the second order PT temperature lowering until reaching the TCP.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…13) can be explained in the following way. On substitution of sulfur by selenium, intercell interaction becomes weaker as a result of the stronger covalence of the chemical bonds [24,25], but the stereoactivity of the Sn 2+ cations and the form of the local potential obviously remain almost unchanged. These factors, mostly the intercell interaction weakening, determine the secondorder PT temperature decrease until the TCP is reached.…”

Section: Discussionmentioning

confidence: 95%

“…The horizontal-shaded bar shows the "waterline temperature" that coincides with the tricritical point positions in the T -P, T -x, and T -y diagrams. chemical bonds increases [24] and the stereoactivity of the remaining Sn 2+ cations decreases. The combined influence of the intercell interaction strengthening and the decrease of the stereoactivity of the two cation sublattices determines the decrease of the second-order ferroelectric PT temperature down to the above-mentioned "waterline temperature" of the TCPs.…”

Section: Discussionmentioning

confidence: 97%

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Ferroelectricity in (Pb_ySn_1−y)₂P₂S₆ mixed crystals and random field BEG model

Rushchanskii

Bilanych

Molnar

et al. 2015

Physica Status Solidi (b)

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In Sn2P2S6 ferroelectric under compression, the second‐order phase transition line is observed down to the tricritical point as the transition temperature decreases to 250 K. A tricriticality at a similar temperature is also revealed in the mixed crystals on S→Se substitution. For the mixed crystals with Sn→Pb substitution, ultrasound, hypersound, and low‐frequency dielectric studies also show heterophase features appearing on decrease of the ferroelectric transition temperature below a so‐called “waterline temperature” near 250 K. Such behavior agrees with the Blume–Emery–Griffiths (BEG) model appropriate for the ferroelectric system under investigation with a three‐well local potential for the order parameter fluctuations. The BEG model modified by the random‐field phase diagram in the vicinity of the tricritical point qualitatively explains the influence of the cationic substitution on the (PbySn1−y)2P2S6 ferroelectric properties.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 97%

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Ferroelectricity in (Pb_ySn_1−y)₂P₂S₆ mixed crystals and random field BEG model

Rushchanskii

Bilanych

Molnar

et al. 2015

Physica Status Solidi (b)

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“…Previously Mössbauer spectroscopy was used in the Sn 2 P 2 S 6 crystal investigation [11][12][13]. It has been found that ionicity of Sn-S bonds is high enough -around 70%.…”

Section: +mentioning

confidence: 99%

Mössbauer ¹¹⁹Sn and XPS spectroscopy of Sn₂P₂S₆ and SnP₂S₆ crystals

Vysochanskiǐ¹,

Baltrūnas²,

Grabar

et al. 2009

Physica Status Solidi (b)

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The monoclinic Sn2P2S6 and rombohedral layered SnP2S6 crystals have been investigated by 119Sn Mössbauer and X‐ray photoelectron spectroscopies. By comparing the isomer shift, quadrupole splitting and binding energies for Sn 3d and 4d core levels in these crystals with such parameters for the metal tin and for different tin compounds it was found that in the Sn2P2S6 crystals Sn existed in the Sn2+ oxidation state and in the SnP2S6 crystals – in the Sn4+ state. Temperature dependences of the isomer shift and Debye–Waller factor satisfied the Debye model in the temperature interval of 6 – 300 K for the SnP2S6 crystals but deviated from such behavior at T > 250 K for Sn2P2S6 crystals. This peculiarity together with specific character of the temperature dependence of the quadrupole splitting were related to the role of the stereoactive Sn 5s2 lone pair electrons in the determined by three‐well potential mechanism of the second order ferroelectric phase transition at 337 K in Sn2P2S6 crystals. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The pseudobrookite, Fe 2 TiO 5 phase has exhibited diverse characteristics like the gas sensing ability, magnetic properties and photocatalytic properties which have been exploited previously for various applications [133][134][135][136][137][138]. Very recently, a novel yellow pigment, Fe 2 TiO 5 decorated mica composites was evaluated for its near infrared reflectance ability which makes it a good candidate as solar reflective coating [139].…”

Section: Fe 2 Tio 5 As a Photoanode Materialsmentioning

confidence: 99%

Recent progress in iron oxide based photoanodes for solar water splitting

Gurudayal

Bassi

Sritharan

et al. 2018

J. Phys. D: Appl. Phys.

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Solar assisted water splitting in a PEC is an attractive concept to store solar energy as hydrogen fuel but the effective efficiency of the process is too low for it to be a serious contender for commercialization. The most important component of the PEC to achieve efficient water splitting is a photo active anode that could effectively absorb photons and deliver holes for the oxygen evolution reaction. Hematite has many attributes that make it a good candidate material for a photoanode but it also has some deficiencies. This article reviews the state-of-the-art hematite-based photoanodes, with special emphasis on attempts made by researchers to overcome its drawbacks. The numerous research reports are categorized under distinct strategies such as nanostructuring, elemental doping, surface passivation, cocatalyst application, conducting template incorporation and heterostructures which are possible pathways to improve the performance of hematite. The scientific understandings of the operating mechanisms for each strategy are systematically presented and discussed, and the improvements achieved by different approaches are compared. Some cutting-edge strategies, such as heterojunctions, could be important and hematite based heterostructures are discussed. A developing interest in an emerging material, Fe 2 TiO 5 is also discussed and some of the important benefits of this material are presented. Finally, the importance of scaling up the technology is discussed and attention is drawn to some possible challenges on scaling up. The paper concludes with some future technology directions and prospects for hematite-based photoanodes.

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Manifestation of the Ferroelectric Phase Transition in the Mössbauer Parameters of the System (SnxPb1−x)2P2S6

Cited by 8 publications

References 6 publications

Ferroelectricity in (Pb_ySn_1−y)₂P₂S₆ mixed crystals and random field BEG model

Ferroelectricity in (Pb_ySn_1−y)₂P₂S₆ mixed crystals and random field BEG model

Mössbauer ¹¹⁹Sn and XPS spectroscopy of Sn₂P₂S₆ and SnP₂S₆ crystals

Recent progress in iron oxide based photoanodes for solar water splitting

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Manifestation of the Ferroelectric Phase Transition in the Mössbauer Parameters of the System (SnxPb1−x)2P2S6

Cited by 8 publications

References 6 publications

Ferroelectricity in (PbySn1−y)2P2S6 mixed crystals and random field BEG model

Ferroelectricity in (PbySn1−y)2P2S6 mixed crystals and random field BEG model

Mössbauer 119Sn and XPS spectroscopy of Sn2P2S6 and SnP2S6 crystals

Recent progress in iron oxide based photoanodes for solar water splitting

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Product

Resources

About

Ferroelectricity in (Pb_ySn_1−y)₂P₂S₆ mixed crystals and random field BEG model

Ferroelectricity in (Pb_ySn_1−y)₂P₂S₆ mixed crystals and random field BEG model

Mössbauer ¹¹⁹Sn and XPS spectroscopy of Sn₂P₂S₆ and SnP₂S₆ crystals