Dielectric Property of Poly- and Single-Crystalline BaTi2O5 Co-Substituted with SrO and ZrO2

2008 ◽  
Vol 388 ◽  
pp. 217-220 ◽  
Author(s):  
Xin Yan Yue ◽  
Rong Tu ◽  
Takashi Goto
Keyword(s):  
Dielectric Property ◽  
Curie Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Remnant Polarization ◽  
Floating Zone ◽  
Single Crystalline ◽  
Arc Melting ◽  
Curie Temperature Tc

Poly- and single-crystalline BaTi2O5 co-substituted with SrO and ZrO2, Ba0.99Sr0.01(Ti1-xZrx)2O5 (BT2SZ) were prepared by arc-melting and floating-zone (FZ) melting, respectively. The specimens showed a significant (020) orientation. The highest permittivity of poly-crystalline BT2SZ was 3880 at x = 0.005 and that of single-crystal was 27000 at x = 0.005. The Curie temperature (Tc) of poly-crystals decreased from 750 to 640 K with increasing x from 0 to 0.026 and that of single-crystals decreased from 750 to 710 K with increasing x from 0 to 0.008. The highest remnant polarization of single crystalline BT2SZ was 7.8×10-2 Cm-2 at x = 0.008, higher than that of the poly-crystal.

Ion Induced Damage and their Annealing in LiTaO3 Single Crystal

1995 ◽  
Vol 396 ◽  
Author(s):  
Z Zhang ◽  
I.A. Rusakova ◽  
W.K. Chu
Keyword(s):  
Curie Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Thermal Annealing ◽  
Crystalline Structure ◽  
Room Temperature ◽  
Complete Recovery ◽  
Oxygen Ions ◽  
Annealing Temperatures ◽  
Crystal Interface

AbstractLiTaO3 single crystals have been implanted with 100 keV oxygen ions at room temperature with doses of 1×1014 /cm2,6xl014/cm2,1.2x1015/cm2, 6xl015/cm2, and 2xl016/cm2. Annealing temperatures ranged from 550 °C to 1075 °C. RBS-channeling and TEM were used for characterization. For partially damaged samples, complete recovery of the crystalline structure was achieved after annealing at 550 °C, which is below the Curie temperature. For totally amorphized samples, thermal annealing induced multidomain growth. These domains extend beyond the original amorphous/crystal interface deep into bulk (1 – 1.5 μm ).

New Quaternary Indides RE7Ni5–xGe3+xIn6 (RE = La, Nd, Sm)

2011 ◽  
Vol 66 (4) ◽  
pp. 433-436
Author(s):  
Nataliya Dominyuk ◽  
Vasyl I. Zaremba ◽  
Rainer Pöttgen
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
X Ray Diffraction ◽  
Slow Cooling ◽  
X Ray ◽  
Arc Melting ◽  
Characteristic Features

The quaternary indides RE7Ni5−xGe3+xIn6 (RE = La,Nd, Sm) were synthesized from the elements by arc-melting. Single crystals were grown by slow cooling of the polycrystalline samples. The structures were characterized by powder and single-crystal X-ray diffraction: Ce7Ni4.73Ge3.27In6 type, P6/m, Z = 1, a = 1147.05(9), c = 426.82(4) pm, wR2 = 0.0652, 528 F2 values for La7Ni4.46Ge3.54In6, a = 1134.5(7), c = 407.1(7) pm, wR2 = 0.0419, 441 F2 values for Nd7Ni4.91Ge3.09In6, and a = 1133.5(2), c = 404.3(1) pm, wR2 = 0.0619, 498 F2 values for Sm7Ni4.31Ge3.69In6, with 25 parameters per refinement. Characteristic features of the RE7Ni5−xGe3+xIn6 structures are hexagonal, AlB2-related prisms around the RE1 atoms and a tricapped, trigonalprismatic coordination of the nickel atoms

Magnetic Properties of Mn Substituted Barium Hexaferrite Single Crystals

2016 ◽  
Vol 843 ◽  
pp. 155-160 ◽  
Author(s):  
D.A. Vinnik ◽  
I.A. Zakharchuk ◽  
Erkki Lähderanta
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Single Crystal ◽  
Saturation Magnetization ◽  
Single Crystals ◽  
Room Temperature ◽  
Barium Hexaferrite ◽  
Substituted Barium Hexaferrite ◽  
Fe Substitution

This paper presents magnetic properties of manganese substituted barium hexaferrite BaFe12-xMnxO19 single crystals. Crystals of BaFe12–xMnxO19 with x up to 1.5 and sizes up to 8 mm were observed. The influence of Fe substitution by Mn on the magnetic properties was investigated. For the BaFe10.5Mn1.5O19 single crystal samples saturation magnetization reduced from 72 to 63.5 emu/g at room temperature, and Curie temperature decreased from 455 to 380 °C.

Ionic Conductivity of Li2ZnTi3O8 Single Crystal

2011 ◽  
Vol 497 ◽  
pp. 26-30 ◽  
Author(s):  
Shinichi Furusawa ◽  
Hiroshi Ochiai ◽  
Khoji Murayama
Keyword(s):  
Ionic Conductivity ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Powder Diffraction ◽  
Floating Zone ◽  
Zinc Titanate ◽  
X Ray ◽  
Temperature Range ◽  
First Time

Single crystals of lithium zinc titanate (Li2ZnTi3O8) were grown in a double-mirror type optical floating-zone furnace for the first time. Single crystals were characterized by X-ray powder diffraction and Laue measurements. The ionic conductivity of the single crystals was measured in the temperature range of 400–700 K. Below 600 K, the ionic conductivity of the single crystal is one to two orders of magnitude higher than that of polycrystalline Li2ZnTi3O8. In the temperature range of 550–600 K, the temperature dependence of the ionic conductivity shows non-Arrhenius behaviour.

Rhodium-rich silicides RERh6Si4 (RE=La, Nd, Tb, Dy, Er, Yb)

2017 ◽  
Vol 72 (11) ◽  
pp. 775-780
Author(s):  
Daniel Voßwinkel ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Single Crystals ◽  
Three Dimensional ◽  
X Ray ◽  
Arc Melting ◽  
Covalently Bonded ◽  
Reactive Flux ◽  
The Rare Earth

AbstractPolycrystalline RERh6Si4 (RE=La, Nd, Tb, Dy, Er, Yb) samples can be synthesized by arc-melting of the elements. Single crystals of LaRh6Si4, NdRh6Si4 and YbRh6Si4 were synthesized from the elements in bismuth fluxes (non-reactive flux medium). The structures were refined on the basis of single-crystal X-ray diffractometer data: LiCo6P4 type, P6̅m2, a=700.56(3), c=380.55(1) pm, wR2=0.0257, 317 F2 values, 19 variables for LaRh6Si4, a=698.4(5), c=377.7(2) pm, wR2=0.0578, 219 F2 values, 19 variables for NdRh6Si4 and a=696.00(3), c=371.97(1) pm, wR2=0.0440, 309 F2 values, 19 variables for YbRh6Si4. The rhodium and silicon atoms build up three-dimensional, covalently bonded [Rh6Si4]δ− polyanionic networks with Rh–Si distances ranging from 239 to 249 pm. The rare earth atoms fill larger cavities within channels of these networks and they are coordinated by six silicon and twelve rhodium atoms in the form of hexa-capped hexagonal prisms.

Magnetic and Dielectric Properties of PbFeBO4 and PbMnBO4 Single Crystals

2014 ◽  
Vol 215 ◽  
pp. 372-377 ◽  
Author(s):  
A.I. Pankrats ◽  
K.A. Sablina ◽  
D.A. Velikanov ◽  
O.A. Bayukov ◽  
A.M. Vorotynov ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Curie Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Neel Temperature ◽  
Strong Anisotropy ◽  
Néel Temperature ◽  
X Ray ◽  
Magnetic And Dielectric Properties ◽  
Magnetic Dielectric

PbFeBO4 and PbMnBO4 single crystals were synthesized. The X-ray, magnetic, dielectric, Mössbauer, and resonance investigations of the crystals were fulfilled. It is established that single-crystal PbFeBO4 is an antiferromagnet with a Néel temperature TN =114 K, while PbMnBO4 is a ferromagnet with a Curie temperature TC = 31 K. Both single-crystal compounds have a strong anisotropy of the magnetic and dielectric properties.

Extended Exciton Diffusion in Rubrene Single-Crystalline Organic Solar Cells

2012 ◽  
Vol 1390 ◽  
Author(s):  
Tetsuhiko Miyadera ◽  
Noboru Ohashi ◽  
Tetsuya Taima ◽  
Toshihiro Yamanari ◽  
Yuji Yoshida
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Film Thickness ◽  
Single Crystal ◽  
Single Crystals ◽  
Organic Solar Cells ◽  
External Quantum Efficiency ◽  
Single Crystalline ◽  
Exciton Diffusion ◽  
Sublimation Method

ABSTRACTSingle-crystalline organic solar cells were investigated. Rubrene single crystals made by train sublimation method were used for the active layer of the solar cells. Typical solar cell characteristics and external quantum efficiency (EQE) were observed with the film thickness of several micrometers. In spite of their large film thickness, the EQE spectra showed no screening effect, which means that absorbed photons efficiently converted to electric charges. This can be attributed to the extended exciton diffusion due to uniform and trap free characteristic of rubrene single crystal.

Laser floating zone growth of Yb, or Nd, doped (Lu0.3Gd0.7)2SiO5 oxyorthosilicate single-crystal rods with efficient laser performance

2020 ◽  
Vol 8 (6) ◽  
pp. 2065-2073 ◽  
Author(s):  
F. Rey-García ◽  
F. M. Costa ◽  
C. Zaldo
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Floating Zone ◽  
Laser Performance ◽  
Laser Floating Zone Technique ◽  
Zone Growth

Laser quality single crystals of Yb- and Nd-doped oxyorthosilicates, (Lu0.3Gd0.7)2SiO5, have been grown by the laser floating zone technique.

Dielectric Properties and Optical Absorption of Single-Crystalline BaTi2O5 Synthesized Using High-Purity BaCO3 as Source Material

2014 ◽  
Vol 616 ◽  
pp. 153-156 ◽  
Author(s):  
Keiji Shiga ◽  
Hirokazu Katsui ◽  
Takashi Goto
Keyword(s):  
Dielectric Properties ◽  
Optical Absorption ◽  
Curie Temperature ◽  
High Purity ◽  
Source Material ◽  
Floating Zone ◽  
Single Crystalline ◽  
Maximum Value ◽  
Dark Blue

Highly pure transparent single-crystalline BaTi2O5, 6 mm in diameter and 15 mm in length, was prepared by a floating zone (FZ) method using high purity BaCO3as a source material. The as-prepared crystal was partially dark blue and became transparent by annealing at 773 K in air. The maximum value of permittivity (εmax) was 36000 at the frequency of 100 kHz and the Curie temperature (TC) was 757 K.

scholarly journals Pb(Er1/2Nb1/2)O3–Pb(Zn1/3Nb2/3)O3–PbTiO3 Single Crystals with High Curie Temperature

Crystals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 22
Author(s):  
Yifei Chen ◽  
Zengzhe Xi ◽  
Feifei Guo ◽  
Pinyang Fang ◽  
Xiaojuan Li ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Single Crystals ◽  
Ferroelectric Properties ◽  
Green Light ◽  
High Curie Temperature ◽  
Flux Method ◽  
Pure Perovskite Structure ◽  
Absolute Quantum Yield ◽  
Curie Temperature Tc ◽  
Absolute Quantum

In this work, 0.15Pb(Er1/2Nb1/2)O3–0.63Pb(Zn1/3Nb2/3)O3–0.22PbTiO3 (15PEN–63PZN–22PT) single crystals with a pure perovskite structure are obtained through the flux method. The phase structure, dielectric, ferroelectric properties and upconversion photoluminescence of the crystals are studied. The ternary crystals along the [110] orientation have a high Curie temperature (Tc = 250 °C) and large coercive field (Ec = 11.0597 kV/cm) which are higher than those of crystals reported previously. Furthermore, the PEN–PZN–PT crystals are produced with a strong green light excited by a 980 nm laser. Being in the range 298–478 K, the emission intensity of all peaks decreases with increase in temperature. The absolute quantum yield (QY) for the crystals is 0.00059%. These excellent properties provide new possibilities for multifunctional materials of optoelectronic devices.

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