Introduction of Fine Engineered Domain Configuration into Potassium Niobate Single Crystals

2007 ◽  
Vol 350 ◽  
pp. 89-92
Author(s):  
Keisuke Yokoh ◽  
Tomomitsu Muraishi ◽  
Song Min Nam ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
...  
Keyword(s):  
Electric Field ◽  
Single Crystals ◽  
Room Temperature ◽  
Single Domain ◽  
Potassium Niobate ◽  
Field Exposure ◽  
Domain State ◽  
Domain Configuration ◽  
Dc Electric Field ◽  
Direction Of Polarization

To induce fine engineered domain configurations into potassium niobate (KNbO3) single crystals, two kinds of methods were performed, i.e., (1) high DC electric field exposure along the opposite direction of polarization of KNbO3 single-domain crystals at room temperature, and (2) introduction of randomly oriented fine domain configuration by heat treatment at 700 °C and then high DC electric field exposure along [001]c direction of KNbO3 multidomain crystals at room temperature. When the method (1) was performed, finally, the poled KNbO3 crystals became to single-domain state again through the formation of multidomain state. On the other hand, the KNbO3 multidomain crystals were obtained by using the method (2), and an enhancement of piezoelectric-related properties was observed.

Domain Wall Engineering in Potassium Niobate Single Crystals and Their Piezoelectric Properties

2006 ◽  
Vol 320 ◽  
pp. 147-150
Author(s):  
Keisuke Yokoh ◽  
Song Min Nam ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Hirohiko Kumagai ◽  
...  
Keyword(s):  
Phase Transition ◽  
Domain Wall ◽  
Electric Field ◽  
Single Crystals ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Potassium Niobate ◽  
Wall Region ◽  
Domain Configuration ◽  
Piezoelectric Constants

For potassium niobate (KNbO3) single crystal, the 31 resonators with the highest piezoelectric constant d31 were designed using transformation of axis. We confirmed that the engineered domain configurations with maximum d31 of –55.1 pC/N was caused by a combination between two polarization with polar directions along [101]c and [-101]c directions. Moreover, if there are larger piezoelectric constants from domain wall region, we can expect the much higher piezoelectric properties. To induce the above domain configuration, a new poling method using patterning electrode was investigated. In this study, the two methods on the basis of temperature-induced phase transition at 207 °C and electric-field-induced phase transition at room temperature were investigated.

Enhanced Piezoelectric Properties of Piezoelectric Single Crystals by Domain Engineering

2003 ◽  
Vol 785 ◽  
Author(s):  
Satoshi Wada ◽  
Koichi Yako ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi
Keyword(s):  
Single Crystals ◽  
Domain Structure ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Domain Size ◽  
Domain Engineering ◽  
The Other ◽  
Domain Structures ◽  
Domain Configuration ◽  
Fine Domain

ABSTRACTFor tetragonal barium titanate (BaTiO3) single crystals, an electric field (E-field) applied along [111]c direction can induce an engineered domain configuration. In this study, the engineered domain structures with different domain sizes were induced into BaTiO3 single crystals, and their piezoelectric properties were investigated as a function of a domain size. Prior to this study, the dependence of domain configuration on the temperature and the E-field was investigated using a polarizing microscope in order to understand the optimum condition for fine and coarse domain structures. As a result, above Curie temperature (Tc) of 132.2 °C, when the E-field over 6 kV/cm was applied along [111]c direction, the engineered domain configuration with fine domain structure appeared. Moreover, it was also found that this fine domain structure was still stable at room temperature without E-field. On the other hand, the coarse domain structure was obtained by poling at just below Tc. Finally, the piezoelectric properties were measured using the 31 resonators with different kinds of domain sizes. As the result, it was found that the piezoelectric properties such as d31 and k31 increased significantly with decreasing domain sizes.

Introduction of Fine Engineered Domain Configuration into Potassium Niobate Single Crystals

2007 ◽  
pp. 89-92
Author(s):  
Keisuke Yokoh ◽  
Tomomitsu Muraishi ◽  
Song Min Nam ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
...  
Keyword(s):  
Single Crystals ◽  
Potassium Niobate ◽  
Domain Configuration

POTASSIUM-SODIUM-RUBIDIUM NIOBATE SINGLE CRYSTALS AND ELECTRIC PROPERTIES

2009 ◽  
Vol 23 (17) ◽  
pp. 3631-3636 ◽  
Author(s):  
H. KIMURA ◽  
R. TANAHASHI ◽  
K. MAIWA ◽  
H. BABA ◽  
Z. X. CHENG ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Single Crystals ◽  
Room Temperature ◽  
Single Phase ◽  
Electric Properties ◽  
Potassium Niobate ◽  
Composition Change ◽  
Potassium Sodium ◽  
Co Doping ◽  
Ionic Size

Potassium-sodium-rubidium niobate single crystals are grown using an original pulling down method, to improve their composition change during a crystal growth, by means of co-doping of small ionic size sodium and large ionic size rubidium into potassium niobate. Even by the co-doping, single crystals can be grown with orthorhombic single-phase at room temperature, as well as pure potassium niobate. Their electric properties, such as the dielectric constant and the impedance, are changed depending on the doping ions.

Photoleitung in 2,3-Dimethylnaphthalin bei gepulster Lichteinstrahlung / Transient Photocurrents in 2,3-Dimethylnaphthalene Single Crystals

1976 ◽  
Vol 31 (3-4) ◽  
pp. 251-258
Author(s):  
W.-W. Falter
Keyword(s):  
Electric Field ◽  
Single Crystals ◽  
Pulse Shape ◽  
Applied Field ◽  
Room Temperature ◽  
Cleavage Plane ◽  
Trap Depth ◽  
Surface Region ◽  
Deep Hole ◽  
Hole Trapping

Hole currents are observed by illuminating 2,3 DN single crystals with 347 nm and 337 nm. The probability of generating free holes is a function of temperature and electric field-strength. In the cleavage plane of the crystals the mobility does not depend on the direction of the applied field and amounts to 2.6·10-1 cm2/Vsec at room temperature, which exceeds the related value measured perpendicularly to the plane by a factor of four. The temperature-dependence of the mobility indicates shallow hole-trapping exspecially close to the surface. The trap depth is estimated to be 10-2 eV. Temperature also influences the pulse shape, by which one can conclude that hole traps of 0.2 eV and ≲ 0.1 eV exist in a thin surface layer. Photocurrents exited with 347 nm increase stronger than quadratically with the electric field. Deep hole traps, being also restricted to the surface region of the crystals, are made responsible for this fact.

scholarly journals Временные зависимости диэлектрических и акустических свойств в монокристаллах PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=- и PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=---7PbTiO-=SUB=-3-=/SUB=-

2019 ◽  
Vol 61 (4) ◽  
pp. 703
Author(s):  
Л.С. Камзина ◽  
Л.А. Кулакова ◽  
H. Luo
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
Single Crystals ◽  
Electric Fields ◽  
Room Temperature ◽  
Ferroelectric Phase ◽  
Local Symmetry ◽  
Gradual Transition ◽  
Velocity Of Sound ◽  
Time Changes

AbstractThe time changes of permittivity, damping and velocity of sound are studied for PbFe_0.5Nb_0.5O_3 and PbFe_0.5Nb_0.5O_3–7PbTiO_3 single crystals in the electric fields of 0 < E < 6 kV/cm. The room-temperature local symmetry of these compounds is shown to be rather more monoclinic than rhombohedral, which is typical of other similar systems. No abrupt sound attenuation anomalies are observed upon the phase transition into the ferroelectric phase in the electric field. The effects seem to be far from the crystal symmetry changes and are attributed to the gradual transition of near-range monoclinic domains into long-range monoclinic domains, as well as to the emergence of the ferroelectric phase. The polarized phase induced in the electric field is only partially stable.

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