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1.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Zhandun V. S., Zinenko V. I.
Заглавие
: Lattice dynamics and the ferroelectric and antiferrodistorsive instabilities in a bulk crystal and thin films of SrZrO3
Место публикации
: Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 7. - P.1388-1396. - ISSN 1063-7834,
DOI
10.1134/S1063783412070359
Примечания
: Cited References: 9. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00067) and the Council on Grants from the President of the Russian Federation in Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2).
Предметные рубрики:
SRTIO3
Аннотация:
The lattice dynamics and energies of phases related to antiferrodistorsive and ferroelectric distortions of bulk crystals and thin films of the SrZrO3 crystal have been calculated within the framework of the ab initio model of an ionic crystal. In the case of a bulk crystal, it has been found that the most energetically favorable phases are related to antiferrodistorsive lattice distortions. Ferroelectricity in the SrZrO3 crystal is suppressed by structural lattice distortions. In the case of thin films, it has been found that the ferroelectric instability is retained after the "rotation" of the oxygen octahedron and the film remains polar both in the case of a free surface and with the inclusion of the
SrTiO3
substrate in the calculation. The spontaneous polarization of thin films of different thicknesses in the ferroelectric phase has been calculated.
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2.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Handunkanda S. U., Curry E. B., Voronov V. N., Said, Ayman H., Guzman-Verri G. G., Brierley R. T., Littlewood P. B., Hancock J. N.
Заглавие
: Large isotropic negative thermal expansion above a structural quantum phase transition
Место публикации
: Phys. Rev. B: American Physical Society, 2015. - Vol. 92, Is. 13. - Ст.134101. - ISSN 1098,
DOI
10.1103/PhysRevB.92.134101. - ISSN 1550235X(eISSN)
Примечания
: Cited References:35. - The authors also acknowledge the valuable conversations with Joe Budnick and Gabe Aeppli. Work at the University of Connecticut is supported by National Science Foundation Award No. DMR-1506825. Work at the University of Costa Rica is supported by Vicerrectoria de Investigacion under Project No. 816-B5-220, and work at Argonne National Laboratory is supported by the US Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-06CH11357. R.T.B. acknowledges support from the Yale Prize Postdoctoral Fellowship. The construction of HERIX was partially supported by the NSF under Grant No. DMR-0115852.
Предметные рубрики:
SCF3 CRYSTAL
CUBIC SCF3
DYNAMICS
SCATTERING
SRTIO3
Аннотация:
Perovskite structured materials contain myriad tunable ordered phases of electronic and magnetic origin with proven technological importance and strong promise for a variety of energy solutions. An always-contributing influence beneath these cooperative and competing interactions is the lattice, whose physics may be obscured in complex perovskites by the many coupled degrees of freedom, which makes these systems interesting. Here, we report signatures of an approach to a quantum phase transition very near the ground state of the nonmagnetic, ionic insulating, simple cubic perovskite material ScF3, and show that its physical properties are strongly effected as much as 100 K above the putative transition. Spatial and temporal correlations in the high-symmetry cubic phase determined using energy- and momentum-resolved inelastic x-ray scattering as well as x-ray diffraction reveal that soft mode, central peak, and thermal expansion phenomena are all strongly influenced by the transition.
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3.
Вид документа
: Статья из журнала
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Автор(ы)
: Orlov Yu. S., Vereshchagin S. N., Novikov, S., V, Burkov A. T., Borus A. A., Sitnikov, M., V, Solovyov L. A., Volochaev M. N., Dudnikov V. A.
Заглавие
: Effect of mechanical activation on the thermoelectric properties of Sr1-xSmxTiO3 ceramics
Коллективы
: Russian Science FoundationRussian Science Foundation (RSF) [19-72-00097]
Место публикации
: Ceram. Int. - 2021. - Vol. 47, Is. 20. - P.28992-28999. - ISSN 0272-8842,
DOI
10.1016/j.ceramint.2021.07.060. - ISSN 1873-3956(eISSN)
Примечания
: Cited References: 31. - This study was supported by the Russian Science Foundation, project no. 19-72-00097
Предметные рубрики:
SRTIO3
LA
MICROSTRUCTURE
CONDUCTIVITY
PERFORMANCE
FIGURE
MERIT
Аннотация:
The Sr1-xSmxTiO3 (х = 0.025, 0.05, 0.075, 0.1, 0.2) strontium titanate solid solutions were prepared from oxides and carbonates using a conventional ceramic technology based on the mechanochemical activation. The electrical conductivity and Seebeck coefficient of the synthesized compounds were measured in the temperature range from 300 to 800 K. We found that the properties of the samples significantly depend on the preliminary mechanochemical activation. The thermoelectric power factor attains maximum value in the hydrogen reduced samples with concentration of х = 0.05 and 0.075 obtained from nanoparticles: 5.5 μW/(cm · K2) for Sr0.95Sm0.05TiO3 (580 K) and 4.10 μW/(cm · K2) for Sr0.925Sm0.075TiO3 (650 K). An increase in the annealing temperature of mechanically activated samples leads to an even greater increase in electrical conductivity and power factor: 9.2 μW/(cm · K2) for Sr0.925Sm0.075TiO3 (650 K).
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4.
Вид документа
: Статья из журнала
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Автор(ы)
: Vorotynov A. M., Pankrats A. I., Kolkov M. I.
Заглавие
: EPR study of the single-ion magnetic anisotropy of the Fe3+ ion in a diamagnetic PbGaBO4 crystal
Коллективы
: Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory; Krasnoyarsk Regional Science Foundation [20-42-240006]
Место публикации
: J. Exp. Theor. Phys. - 2021. - Vol. 133, Is. 5. - P.574-580. - ISSN 1063-7761,
DOI
10.1134/S1063776121110054. - ISSN 1090-6509(eISSN)
Примечания
: Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Regional Science Foundation (project no. 20-42-240006 "Synthesis and study of oxide single crystals containing Pb2+ and Bi3+ with partial substitution in one of the subsystems: magnetic structures and magnetodielectric effect")
Предметные рубрики:
ELECTRON PARAMAGNETIC RESONANCE
TRANSITION
SrTiO3
Аннотация:
Crystals of a diamagnetic PbGaBO4 analog containing a small amount (about 0.5 at %) of Fe3+ ions are grown. The single-ion EPR spectra of Fe3+ in PbGa1-xFexBO4 single crystals are analyzed with allowance for a crystal structure. The existence of four magnetically nonequivalent positions of Fe3+ ions with different local anisotropy axis directions has been confirmed. The parameters of the spin Hamiltonian written in the approximation of the local orthorhombic symmetry of a paramagnetic center are determined. The values of single-ion anisotropy constants, which are unusually high for S ions, is shown to be caused by a strong distortion of the ligand environment of Fe3+ ions. The single-ion contribution to the energy of the total magnetic anisotropy of a magnetically concentrated PbGaBO4 crystal is estimated. Two-ion mechanisms of the Fe–Fe interaction anisotropy are assumed to play a dominant role in the formation of magnetic anisotropy in a magnetically concentrated crystal.
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