The Curie Temperature of LiNbO<sub>3</sub>

Smolenskiĭ, G. A.; Kraǐnik, N. N.; Khuchua, Nina; Zhdanova, V. V.; Myl'nikova, I.E.

doi:10.1002/pssb.19660130202

Cited by 61 publications

(25 citation statements)

References 10 publications

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“…42, we use the energy difference between the high-symmetry (P 2 1 /c) and low-symmetry (P c) to obtain a ferroelectric Curie temperature of 927 K for the superlattice. This value is close to the extrapolated transition temperature for LiNbO 3 (>1,400 K) [43], and far exceeds that of bulk LiOsO 3 where inversion symmetry is lost near 140 K [10].…”

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confidence: 76%

Design of a Mott Multiferroic from a Nonmagnetic Polar Metal

et al. 2015

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We examine the electronic properties of newly discovered "ferroelectric" metal LiOsO3 combining density-functional and dynamical mean-field theories. We show that the material is close to a Mott transition and that electronic correlations can be tuned to engineer a Mott multiferroic state in 1/1 superlattice of LiOsO3 and LiNbO3. We use electronic structure calculations to predict that the (LiOsO3)1/(LiNbO3)1 superlattice is a type-I multiferroic material with a ferrolectric polarization of 41.2 µC cm −2 , Curie temperature of 927 K, and Néel temperature of 671 K. Our results support a route towards high-temperature multiferroics, i.e., driving non-magnetic polar metals into correlated insulating magnetic states. Introduction.-Multiferroics (MF) are a class of insulating materials where two (or more) primary ferroic order parameters, such as a ferroelectric polarization and long-range magnetic order, coexist. Technologically, they offer the possibility to control magnetic polarizations with an electric field for reduced power consumption [1, 2]. Nonetheless, intrinsic room-temperature MF remain largely elusive. This fact may be understood by examining the microscopic origins for the ferroic order which aids in classifying different phases: In Type-I MF, ferroelectricity and magnetism arise from different chemical species with ordering temperatures largely independent of one another and weak magnetoelectric (ME) coupling [3]. The ferroelectric ordering also typically appears at temperatures higher than the magnetic order, and the spontaneous polarization P is large since it is driven by a second-order Jahn-Teller distortion, e.g., BiFeO 3 [3, 4]. In Type-II MF, however, magnetic order induces ferroelectricity, which indicates a strong ME coupling between the two order parameters. Nonetheless, P is usually much smaller, e.g., by a factor of 10 2 as in R-Mn 2 O 5 (R being rare earth) [5]. In a few MFs with high-transition temperatures, i.e., BiFeO 3 [6] and Sr 1−x Ba x MnO 3 [7-9], magnetism is caused by Mott physics arising from strong correlations. The interactions localize the spins at high temperature, paving the way for magnetic ordering at room temperature. Materials where this robust magnetism is coupled with ferroelectric distortions are ideal candidates for a room-temperature MFs.

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confidence: 76%

Design of a Mott Multiferroic from a Nonmagnetic Polar Metal

et al. 2015

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“…• C which is close to the melting temperature [5,6]. Over the years several defect models were proposed by different authors; however, the defect chemistry in LiNbO 3 is not yet fully understood [2,[7][8][9][10][11][12].…”

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confidence: 81%

Low-Temperature DC Conductivity of LiNbO₃ Single Crystals

Ruprecht¹,

Rahn

Schmidt

et al. 2012

Zeitschrift Für Physikalische Chemie

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We report on conductivity measurements of LiNbO 3 single crystals with congruent composition in ambient atmosphere between 449 and 727 K which include the lowest temperatures covered so far. The ionic DC conductivity observed along the c-axis at, e. g., 650 K is 6.7 × 10 −9 S/cm and shows an activation energy of 1.33 eV. The corresponding Li + diffusion coefficients range between 2.5 × 10 −22 and 1.4 × 10 −16 m 2 /s. These results are perfectly consistent with our conductivity results in the high-temperature regime as well as SIMS measurements published recently (Rahn et al., Phys. Chem. Chem. Phys. 14 (2012) 2427. From the Li + diffusion coefficients obtained here a Haven ratio of 0.7(2) can be deduced.

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“…However, for energy conversion applications the amplitude of the temperature oscillation is typically large and the pyroelectric effect is nonlinear. Accounting for these nonlinear effects, Itskovsky [22] studied LiNbO 3 featuring T Curie =1140 • C [23] and operating with tens of degree Kelvin amplitude within the phase transition region. The author theoretically established that "the instantaneous energy conversion efficiency for ferroelectrics with parameters similar to those of LiNbO 3 type can reach over 20% in the relaxation process on cooling".…”

Section: Direct Pyroelectric Energy Convertermentioning

confidence: 99%