PHOTOFERROELECTRIC EFFECTS IN AV BVI CVII AND BaTiO3-TYPE FERROELECTRICS

Belyaev, L. M.; Fridkin, V. M.; Grekov, A. A.; Kosonogov, N. A.; Rodin, A. I.

doi:10.1051/jphyscol:1972240

Cited by 5 publications

(9 citation statements)

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“…When the cubic phase is dynamically stable (n ph > 0.1 e=f:u:), we find accordingly that 000=000 is the lowest-energy structure, which is confirmed by the disappearance of polar atomic displacements and the cell shape distortions of all considered phases (see the Supplemental Material [31]). The predicted transition toward the 000=000 phase is consistent with the experimental observation, in BTO, of a downward shift of the Curie temperature under illumination [47]. Besides, the flattening of the energy landscape around 0.03 e=f:u: (≈5 × 10 20 e:cm −3 ) may be accompanied by a monoclinic phase transition (see the Supplemental Material [31]).…”

supporting

confidence: 85%

Photoinduced Phase Transitions in Ferroelectrics

et al. 2019

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Ferroic materials naturally exhibit a rich number of functionalities, which often arise from thermally, chemically, or mechanically induced symmetry breakings or phase transitions. Based on density functional calculations, we demonstrate here that light can drive phase transitions as well in ferroelectric materials such as the perovskite oxides lead titanate and barium titanate. Phonon analysis and total energy calculations reveal that the polarization tends to vanish under illumination, to favor the emergence of nonpolar phases, potentially antiferroelectric, and exhibiting a tilt of the oxygen octahedra. Strategies to tailor photoinduced phases based on phonon instabilities in the electronic ground state are also discussed.

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confidence: 85%

Photoinduced Phase Transitions in Ferroelectrics

et al. 2019

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“…with numerical values for other relaxor systems within the limit of their uncertainties [28]. For example, f o is typically of order 3-100 GHz.…”

Section: Vogel-fulcher (Vf) Relationmentioning

confidence: 99%

“…The illumination of light also changes the phase transition temperature (T c ) of BaTiO 3 (∆Tc = -2.6 K with 4700 Angstrom illumination) and affect the electronic structure of SbSI largely. [26,27,28] The discovery of relaxor behavior in ABO 3 structures with B-site non-isovalent ions. The symmetric lineshape of O1s suggests high sample quality with stable ABO 3 structure.…”

mentioning

confidence: 99%

Novel optically active lead-free relaxor ferroelectric (Ba_0.6Bi_0.2Li_0.2)TiO₃

Borkar

Rao

Dutta

et al. 2016

J. Phys.: Condens. Matter

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Abstract:We discovered a near room temperature lead-free relaxor-ferroelectric (Ba 0.6 Bi 0.2 Li 0.2 )TiO 3 (BBLT) having A-site compositional disordered ABO 3 perovskite structure. Microstructureproperty relations revealed that the chemical inhomogeneities and development of local polar nano regions (PNRs) are responsible for dielectric dispersion as a function of probe frequencies and temperatures. Rietveld analysis indicates mixed crystal structure with 80% tetragonal structure (space group P4mm) and 20% orthorhombic structure (space group Amm2) which is confirmed by the high resolution transmission electron diffraction pattern. Dielectric constant and tangent loss dispersion with and without illumination of light obey nonlinear Vogel-Fulture relation. It shows slim polarization-hysteresis (P-E) loops and excellent displacement coefficients (d 33 ~ 233 pm/V) near room temperature, which gradually diminish near the maximum dielectric dispersion temperature (T m ). The underlying physics for light-sensitive dielectric dispersion was probed by X-ray photon spectroscopy (XPS) which strongly suggests 2 that mixed valence of bismuth ions, especially Bi 5+ ions, are responsible for most of the optically active centers. Ultraviolet photoemission measurements showed most of the Ti ions are in 4+states and sit at the centers of the TiO 6 octahedra, which along with asymmetric hybridization between O 2p and Bi 6s orbitals appears to be the main driving force for net polarization. ThisBBLT material may open a new path for environmental friendly lead-free relaxor-ferroelectric research.

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“…Several convincing models for the possible beneficial effects of ferroelectricity in these materials have been proposed, and it is hard to ignore the potential benefits of having a functioning ferroelectric solar absorber layer. It is also interesting to note that inorganic perovskites with a ferroelectric nature are also being explored for photovoltaics, and the effect is known as photo‐ferroelectric/photoferroic or ferroelectric photovoltaic effect …”

Section: Application In Solar Cellsmentioning

confidence: 99%

“…In this context, two classes (inorganic–organic hybrid perovskites and inorganic ferroelectric perovskites) of perovskites, focused on in this review, are well established in their respective domains. On the one end, hybrid perovskites are well known for their photovoltaic response with existing research focusing on understanding their behavior on the basis of their crystal structure in order to design improved materials, while, on the other hand, perovskite ferroelectrics, another special class of perovskites, are well known for piezoelectric, pyroelectric, and thermal energy conversion systems, and are also gaining interest as photovoltaic and optoelectronic materials . Intriguingly, both hybrid perovskites and ferroelectrics are also being investigated for thermoelectric applications .…”

Section: Introductionmentioning

confidence: 99%

Mutual Insight on Ferroelectrics and Hybrid Halide Perovskites: A Platform for Future Multifunctional Energy Conversion

et al. 2019

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An insight into the analogies, state-of-the-art technologies, concepts, and prospects under the umbrella of perovskite materials (both inorganicorganic hybrid halide perovskites and ferroelectric perovskites) for future multifunctional energy conversion and storage devices is provided. Often, these are considered entirely different branches of research; however, considering them simultaneously and holistically can provide several new opportunities. Recent advancements have highlighted the potential of hybrid perovskites for high-efficiency solar cells. The intrinsic polar properties of these materials, including the potential for ferroelectricity, provide additional possibilities for simultaneously exploiting several energy conversion mechanisms such as the piezoelectric, pyroelectric, and thermoelectric effect and electrical energy storage. The presence of these phenomena can support the performance of perovskite solar cells. The energy conversion using these effects (piezo-, pyro-, and thermoelectric effect) can also be enhanced by a change in the light intensity. Thus, there lies a range of possibilities for tuning the structural, electronic, optical, and magnetic properties of perovskites to simultaneously harvest energy using more than one mechanism to realize an improved efficiency. This requires a basic understanding of concepts, mechanisms, corresponding material properties, and the underlying physics involved with these effects. His current research focuses on developing functional inorganic−organic hybrid materials and energy conversion devices including perovskite solar cells.are found to have lower t-values (0.75 < t < 1.0). t-values help in governing and tuning the presence of ferroelectricity in perovskites [11] and are responsible for the transition temperatures in ferroelectrics. [57] In the case of hybrid inorganic-organic perovskites, the A-site and/or X-site ions are replaced by molecular building blocks; hence, the tolerance

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PHOTOFERROELECTRIC EFFECTS IN A_V B_VI C_VII AND BaTiO₃-TYPE FERROELECTRICS

Cited by 5 publications

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Photoinduced Phase Transitions in Ferroelectrics

Photoinduced Phase Transitions in Ferroelectrics

Novel optically active lead-free relaxor ferroelectric (Ba_0.6Bi_0.2Li_0.2)TiO₃

Mutual Insight on Ferroelectrics and Hybrid Halide Perovskites: A Platform for Future Multifunctional Energy Conversion

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PHOTOFERROELECTRIC EFFECTS IN AV BVI CVII AND BaTiO3-TYPE FERROELECTRICS

Cited by 5 publications

References 0 publications

Photoinduced Phase Transitions in Ferroelectrics

Photoinduced Phase Transitions in Ferroelectrics

Novel optically active lead-free relaxor ferroelectric (Ba0.6Bi0.2Li0.2)TiO3

Mutual Insight on Ferroelectrics and Hybrid Halide Perovskites: A Platform for Future Multifunctional Energy Conversion

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PHOTOFERROELECTRIC EFFECTS IN A_V B_VI C_VII AND BaTiO₃-TYPE FERROELECTRICS

Novel optically active lead-free relaxor ferroelectric (Ba_0.6Bi_0.2Li_0.2)TiO₃