79 research outputs found
Ferroelectricity and magnetism in Pb(Fe0.5Nb0.5)O3–Pb(Yb0.5Nb0.5)O3–PbTiO3 single crystals
No full textDomain structure, ferroelectric and magnetic properties of [001]-oriented multiferroic single crystals Pb(Fe0.5Nb0.5)O3–Pb(Yb0.5Nb0.5)O3–PbTiO3 (PFN–PYN–PT) with various compositions were investigated with the purpose of understanding the ferroelectric and magnetic order. The samples were determined to be rhombohedral phase or coexistence of tetragonal and rhombohedral phases by means of X-ray diffraction analysis and optical study. Furthermore, the domain configuration in tetragonal phase always takes on 90° domain wall. All samples exhibit well-developed saturated hysteresis loop, indicating no substantial increase of conductivity despite the introduction of Fe3+ ions. But the piezoelectric coefficients were reduced due to the introduction of PFN. In addition, the PFN–PYN–PT single crystals showed paramagnetic behavior, resulting from the –O–Fe3+–O–Nb/Yb/Ti–O–Fe3+–O– magnetic interaction. Interestingly, M–H hysteresis loops display a magnetic relaxor behavior
Morphotropic phase diagram and dielectric and ferroelectric properties of (1−x)Ba(Zn1∕3Nb2∕3)O3−xPbTiO3 solid solution
No full textA New Solid Solution of (1-x)Ba(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-xPbTiO<sub>3</sub> with Dielectric, Relaxor and Ferroelectric Properties
No full textRelaxor behavior in the solid solution between dielectric Ba(Mg1∕3Nb2∕3)O3 and ferroelectric PbTiO3
No full textGrowth and spectroscopic properties of Cr3+-doped LaSc3(BO3)(4)
No full textThis paper reports the growth and optical properties of Cr3+-doped LaSc3(BO3)(4) (Cr3+ :LSB). The Cr3+ -doped LaSc3(BO3)(4) crystal with dimension null set 25 x 35 mm(3) was obtained by Czochralski method. The absorption and photoluminescence spectra have been measured. The dominant features of absorption spectrum are two broadbands at ca. 400-700 nm. A broad emission band extending from 740 to 1280 nm with a peak at near 960 nm was observed. The lifetime of Cr3+ :LSB was 15 mus. (C) 2002 Elsevier Science B.V. All rights reserved
Top-seeded solution growth and characterization of PMN–0.31PT piezoelectric single crystals
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Effects of defect dipoles on tunable dielectric response in relaxor ferroelectric ceramics
No full textOptical study of Cr3+-doped LaSc3(BO3)(4) crystal
No full textThis paper reports on the optical properties of Cr3+-doped LaSc3(BO3)(4) (Cr3+:LSB). Based on measurement of the absorption spectrum the crystal field strength Dq, the Racah parameters B and C were calculated. The photoluminescence spectrum of Cr3+:LSB via T-4(2) -->(4)A(2) transition is a broadband emission from 740 to 1280 nm at room temperature. The measurements of absorption and photoluminescence spectra show that in Cr3+:LSB the Cr3+ ions occupy weak crystal field sites
Preparation and Characterization of Lead-Free (K0.5Na0.5)NbO3-LiNbO3 and (K0.5Na0.5)NbO3-LiTaO3 Ferroelectric Single Crystals
No full textLead-free (K0.5Na0.5)NbO3-LiNbO3 (KNN-LN) and (K0.5Na0.5)NbO3-LiTaO3 (KNN-LT) ferroelectric single crystals, with the dimensions of 11 ´ 11 ´ 5 mm3 and 5 ´ 5 ´ 3 mm3, were grown successfully using the top-seeded solution growth (TSSG) method, respectively. The crystal structures were analyzed by means of X-ray diffraction, showing orthorhombic symmetry for KNN-LN single crystals and coexistence of orthorhombic and tetragonal symmetry for KNN-LT single crystals at room temperature. The orthorhombic-tetragonal (TO-T) and tetragonal-cubic (TC) phase transition temperatures are 195 °C and 420 °C for the KNN-LN single crystals, and 130 °C and 280 °C for KNN-LT single crystals, respectively. The remnant polarization (Pr) is 27.8 μC/cm2 with a coercive field (Ec) of 17 kV/cm for KNN-LT single crystals. The two single crystals showed 90° domains with layers in (parallel) straight lines, while KNN-LT single crystals have a larger domain region. The actual stoichiometry deviates easily from the original composition in the process of crystal growth, thus, an appropriate nominal composition and optimized crystal growth method is desired to get high-quality crystals in the future
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