Calorimetric study of ferroelectric <font>BaTiO</font><sub>3</sub> in cubic phase

Grabovsky, S. V.; Shnaĭdshteĭn, I. V.; Takeuchi, Masaki; Onodera, Akira; Strukov, B. A.

doi:10.1142/s2010135x1350032x

Cited by 13 publications

(8 citation statements)

References 28 publications

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“…Moreover, the mode frequency and the half width of the LA mode of both crystals were indistinguishable from each other in the paraelectric phase. Grabovsky et al investigated the specific heat of several BaTiO 3 single crystals of different origin and found that the addition contribution to the specific heat exists in the paraelectric phase [57]. This anomalous high-temperature specific-heat existed up to T C + 60 K and was independent of the sample growth conditions.…”

Section: Discussionmentioning

confidence: 99%

Precursor Phenomena of Barium Titanate Single Crystals Grown Using a Solid-State Single Crystal Growth Method Studied with Inelastic Brillouin Light Scattering and Birefringence Measurements

Lee

et al. 2018

Molecules

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The nature of precursor phenomena in the paraelectric phase of ferroelectrics is one of the main questions to be resolved from a fundamental point of view. Barium titanate (BaTiO3) is one of the most representative perovskite-structured ferroelectrics intensively studied until now. The pretransitional behavior of BaTiO3 single crystal grown using a solid-state crystal growth (SSCG) method was investigated for the first time and compared to previous results. There is no melting process in the SSCG method, thus the crystal grown using a SSCG method have inherent higher levels of impurity and defect concentrations, which is a good candidate for investigating the effect of crystal quality on the precursor phenomena. The acoustic, dielectric, and piezoelectric properties, as well as birefringence, of the SSCG-grown BaTiO3 were examined over a wide temperature range. Especially, the acoustic phonon behavior was investigated in terms of Brillouin spectroscopy, which is a complementary technique to Raman spectroscopy. The obtained precursor anomalies of the SSCG-grown BaTiO3 in the cubic phase were similar to those of other single crystals, in particular, of high-quality single crystal grown by top-seeded solution growth method. These results clearly indicate that the observed precursor phenomena are common and intrinsic effect irrespective of the crystal quality.

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Section: Discussionmentioning

confidence: 99%

Precursor Phenomena of Barium Titanate Single Crystals Grown Using a Solid-State Single Crystal Growth Method Studied with Inelastic Brillouin Light Scattering and Birefringence Measurements

Lee

et al. 2018

Molecules

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“…Let's now check this relationship for usefulness in practical application. For example, let us apply it to calculate the specific *e-mail: evgeniy.dulkin@mail.huji.ac.il heat, L, during the phase transition in BaTiO 3 crystals due to essential contradiction in their L values: ~ 2.37 J/kg 4 and ~ 0.54 J/kg 6 .…”

Section: Resultsmentioning

confidence: 99%

Estimation of Specific Heat of BaTiO3 Crystals Derived from Relationship Between Uniaxial Pressure and Electric Field

Dul’kin

Roth

2022

Mat. Res.

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Shifting the Curie temperature in dependence on both uniaxial pressure and electric field in BaTiO 3 crystals was studied based on literature data. It was shown that both these dependences perfectly coincide when adjusting the scale. Based on coincidence of these dependencies a relationship between both an uniaxial pressure and an electric field when shifting the Curie temperature was established. The specific heat is calculated using this relationship.

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“…The specific heat (C p ) shows a sharp and clear λ-type anomaly at T c in bulk BaTiO 3 [20]. In the case of thin films, it changes to a broad, small and characteristic one with decreasing film thickness [21].…”

Section: Introductionmentioning

confidence: 98%

“…Temperature dependence of specific heat of BaTiO 3 bulk single crystal around the paraelectric-ferroelectric phase transition point T c (409.5 K)[20]. Temperature dependence of specific heat of BaTiO 3 epitaxial thin films on SrTiO 3 substrate; (a) 2000 Å thick and (b) 60 Å thick[21].…”

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confidence: 99%

Ferroelectricity in Layered Perovskites as a Model of Ultra-Thin Films

Fukunaga¹,

Takeuchi²,

Onodera³

2016

WJCMP

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The instability of thin ferroelectric films is discussed based on the close similarity of dielectric properties between bulk Bi-layered perovskites and thin BaTiO 3 films. The dielectric properties of pseudo-two-dimensional layered perovskites suggest that the bulk layered ferroelectric is a good model of ultra-thin ferroelectric film with a few perovskite units, free from any misfit lattice strain. It seems plausible that the ferroelectric interaction is still prominent but shows a crossover from ferroelectric to antiferroelectric along the unique c-axis (perpendicular to the film plane); with decreasing thickness, the ferroelectricity appears within the plane, which results in so-called "canted ferroelectricity". An extra relaxation mode induced by surface effect of thin films correlates with soft mode, which results in a new intermediate phase between the paraelectric and ferroelectric phases. These evidences may indicate no critical thickness even for ferroelectric ultrathin films. KeywordsFerroelectricity, Layered Oxide, Perovskite, Thin Film, Size Effect * Corresponding author. M. Fukunaga et al. 225long-range force in dielectric media, it is important to know the exact size effect of thin films on ferroelectricity and the critical thickness where the ferroelectricity may disappear. However, various experiments of ferroelectric thin films have not been enough investigated because of its difficulty to grow a good quality of ultra-thin films and to estimate the effects of misfit strain due to their substrate. It is of fundamental interest in twodimensional structure of ferroelectric thin films experimentally and theoretically since early times [6]. There have been many attempts to study the size effect on ferroelectricity, leading to a rich literature of both experimental and theoretical works [7] [8]. Especially, studies of ferroelectric perovskites are activated and are promised as one of the best sources of ferroelectric thin films since the perovskite oxides show prominent high dielectric constants and piezoelectric properties.The similarity of dielectric and structural features has been observed between BaTiO 3 thin films and Bilayered perovskite compounds. This means that both materials have a common mechanism for ferroelectric activity. Among Bi-layered perovskites, SrBi 2 Ta 2 O 9 (abbreviated as SBT) has been extensively studied as a candidate for ferroelectric non-volatile memory devices. Based on dielectric and structural similarities, it may be reasonable to consider that SBT is a good model for an ideal ferroelectric thin film, free from any misfit lattice strain. The close analogy between Bi-layered perovskites and ferroelectric thin films was pointed out simply in a previous paper [9]. In this review, we will discuss the ferroelectric stability in ultra-thin films in detail from the viewpoint of the nature of Bi-layered perovskites. BaTiO 3 : Bulk Crystal and Thin FilmWe will simply introduce fundamentals of barium titanate, BaTiO 3 , in the form of bulk crystal and thin films. Perovskite oxide...

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Calorimetric study of ferroelectric BaTiO₃ in cubic phase

Cited by 13 publications

References 28 publications

Precursor Phenomena of Barium Titanate Single Crystals Grown Using a Solid-State Single Crystal Growth Method Studied with Inelastic Brillouin Light Scattering and Birefringence Measurements

Precursor Phenomena of Barium Titanate Single Crystals Grown Using a Solid-State Single Crystal Growth Method Studied with Inelastic Brillouin Light Scattering and Birefringence Measurements

Estimation of Specific Heat of BaTiO3 Crystals Derived from Relationship Between Uniaxial Pressure and Electric Field

Ferroelectricity in Layered Perovskites as a Model of Ultra-Thin Films

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Calorimetric study of ferroelectric BaTiO3 in cubic phase

Cited by 13 publications

References 28 publications

Precursor Phenomena of Barium Titanate Single Crystals Grown Using a Solid-State Single Crystal Growth Method Studied with Inelastic Brillouin Light Scattering and Birefringence Measurements

Precursor Phenomena of Barium Titanate Single Crystals Grown Using a Solid-State Single Crystal Growth Method Studied with Inelastic Brillouin Light Scattering and Birefringence Measurements

Estimation of Specific Heat of BaTiO3 Crystals Derived from Relationship Between Uniaxial Pressure and Electric Field

Ferroelectricity in Layered Perovskites as a Model of Ultra-Thin Films

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Calorimetric study of ferroelectric BaTiO₃ in cubic phase