Stoichiometric LiTaO3 single crystal growth by double crucible Czochralski method using automatic powder supply system

Furukawa, Yasunori; Kitamura, Kenji; Suzuki, Etsuko; Niwa, K.

doi:10.1016/s0022-0248(98)00921-x

Cited by 173 publications

(83 citation statements)

References 15 publications

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“…3. Using the reported calibration from the energy position at an absorption coefficient equal to 20 cm À 1 [19], the ultraviolet absorption edges of the as-grown crystal was found to be 272.5 nm. The optical absorption edge strongly depends on the composition of LT crystals (it shifts from 273 nm for CLT to 268 nm for SLT, and to 266 nm for Mg-SLT) [13].…”

Section: Resultsmentioning

confidence: 99%

Growth, optical characterization and evaluation of laser properties of Yb3+, Mg2+:LiTaO3 crystal

Zhang

Yin

Gong

et al. 2013

Journal of Crystal Growth

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Section: Resultsmentioning

confidence: 99%

Growth, optical characterization and evaluation of laser properties of Yb3+, Mg2+:LiTaO3 crystal

Zhang

Yin

Gong

et al. 2013

Journal of Crystal Growth

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“…Figure 2c shows the crystal structure of LiTaO3 (LTO). Above the ferroelectric phase transition of ~618°C 8,9 (depending on stoichiometry), the Li atom sits in a high-symmetry position (space Derivation of the pyroelectric and electrocaloric coefficients follows from thermodynamic analysis. The total free energy density of a dielectric is…”

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confidence: 99%

Next-generation electrocaloric and pyroelectric materials for solid-state electrothermal energy interconversion

Mantese²,

et al. 2014

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Thin-film electrocaloric and pyroelectric electrothermal interconversion energy sources have recently emerged as viable means for primary and auxiliary solid-state cooling and power generation. Two significant advances have facilitated this development: (1) the formation of high-quality polymeric and ceramic thin films with figures of merit that project system-level performance as a large percentage of Carnot efficiency and (2) the ability of these newer materials to support larger electric fields, thereby permitting operation at higher voltages.This makes the power electronic architectures more favorable for thermal to electric interconversion. Current research targets to adequately address commercial device needs include reduction of parasitic losses, increases in mechanical robustness, and the ability to form nearly free-standing elements with thicknesses in the range of 1-10 m. This article describes the current state-ofthe-art materials, thermodynamic cycles, and device losses and points toward potential lines of research that would lead to substantially better figures of merit for electrothermal interconversion.Keywords: Material type-polymer (143), Material type-ceramic (121), Functionality-energy generation (189), , Material form-film (231), Transport-ferroelectricity (288) Fundamentals of ferroelectrics materials: Pyroelectrics and ElectrocaloricsIt has long been known that, when heated, materials such as the borosilicate tourmaline have the ability to attract objects such as pieces of feather, pollen, and cloth. This is due to the appearance of a surface charge in response to a temperature change. The history of this phenomenon, which is known as the pyroelectric effect (PE), was charted by Lang, 1 from its first description by Dielectrics whose structures possess both a unique axis of symmetry and lack a center of symmetry (i.e., that are "polar") display a spontaneous polarization (PS) and will exhibit a PE due to temperature-induced changes in PS. MRS BulletinThese variations in PS result in uncompensated charge appearing along surfaces that have a component normal to the polar axis, generating a net voltage across the dielectric. If the surfaces are provided with electrodes that are connected through an external circuit, this surface charge can cause a current to flow, potentially resulting in useful work. In the absence of an applied electric field or applied stress, the pyroelectric coefficient p(T) is defined as the rate of change of spontaneous polarization with temperature such that p(T) = dPS/dT. If electrodes are applied to the major faces perpendicular to the polar axis, as illustrated in Figure 1a, and the temperature is changed at a rate dT/dt, then the short-circuitThe converse of the pyroelectric effect is called the electrocaloric effect (ECE; see Figure 1b). Here, an electric field applied to a polar dielectric causes a change in temperature in the material. Conceptually, the ECE is somewhat harder to grasp than the PE, but it is analogous to the changes in temperature and en...

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“…The computer simulation has confirmed applicability of the kinetic approach to the domain shape explanation. 3 and high optical damage threshold. 4 The LT crystals are very promising materials for nonlinear optical applications, such as frequency conversion of coherent light.…”

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confidence: 99%

“…3 The circular shape sputtered electrodes of 50 nm-thick Cr with 2 mm diameter were deposited on Zþ polar surface and solid electrodes-on Z-surface. The polarization reversal was performed by application of the single field pulse using high voltage amplifier TREK Model 20/20C.…”

mentioning

confidence: 99%

Shape of isolated domains in lithium tantalate single crystals at elevated temperatures

Shur

Ахматханов

Chezganov

et al. 2013

Applied Physics Letters

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Stoichiometric LiTaO3 single crystal growth by double crucible Czochralski method using automatic powder supply system

Cited by 173 publications

References 15 publications

Growth, optical characterization and evaluation of laser properties of Yb3+, Mg2+:LiTaO3 crystal

Growth, optical characterization and evaluation of laser properties of Yb3+, Mg2+:LiTaO3 crystal

Next-generation electrocaloric and pyroelectric materials for solid-state electrothermal energy interconversion

Shape of isolated domains in lithium tantalate single crystals at elevated temperatures

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