Leakage Current and Polarization Properties of (Bi0.5Na0.5)TiO3-BaTiO3 Single Crystals

2013 ◽  
Vol 582 ◽  
pp. 96-99 ◽  
Author(s):  
Kiyotaka Hirano ◽  
Hiroaki Onozuka ◽  
Yuuki Kitanaka ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Oxygen Vacancy ◽  
Single Crystal ◽  
Single Crystals ◽  
Leakage Current ◽  
Remanent Polarization ◽  
Vacancy Concentration ◽  
Oxygen Vacancy Concentration ◽  
Low Oxygen ◽  
High Oxygen Pressure ◽  
Top Seeded Solution Growth

Single crystal of ferroelectric (Bi,Na)TiO3BaTiO3(BNTBT) with tetragonalP4mmstructure grown by a top-seeded solution growth (TSSG) method at a high oxygen pressure (PO2) of 0.9 MPa and their properties were compared with those of the crystals grown at aPO2of 0.1 MPa. The crystals obtained atPO2= 0.9 MPa exhibited a remanent polarization (Pr) of 54μC/cm2, which was much larger than those of the crystals grown atPO2= 0.1 MPa (20μC/cm2). It is suggested that the largePris attributed to a low oxygen vacancy concentration.

Crystal Growth and Characterization of (Bi0.5Na0.5)TiO3-BaTiO3 Single Crystals Obtained by the Top-Seeded Solution Growth Method under High-Pressure Oxygen Atmosphere

2013 ◽  
Vol 566 ◽  
pp. 25-28
Author(s):  
Hiroaki Onozuka ◽  
Yuuki Kitanaka ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Vacancy Concentration ◽  
Solution Growth ◽  
Oxygen Vacancy Concentration ◽  
Low Oxygen ◽  
High Oxygen Pressure ◽  
Growth Method ◽  
High Pressure Oxygen ◽  
Top Seeded Solution Growth ◽  
Large Remanent Polarization

A single crystal of ferroelectric 0.88(Bi,Na)TiO30.12BaTiO3 (BNTBT) solid solution with tetragonal P4mm structure was grown by the top-seeded solution growth (TSSG) method at a high oxygen pressure (PO2) of 0.9 MPa. The crystals grown by the high-PO2 TSSG method exhibited a large remanent polarization (Pr) of 54 μC/cm2, which leads to a spontaneous polarization of 54 μC/cm2. The large Pr compared with that of crystals grown at PO2 = 0.1 MPa is suggested to originate from a low oxygen vacancy concentration for the crystals grown at a higher PO2. The high-PO2 TSSG method was demonstrated to be effective for obtaining BNTBT crystals with superior polarization and piezoelectric properties.

scholarly journals Uncovering ferroelectric polarization in tetragonal (Bi1/2K1/2)TiO3–(Bi1/2Na1/2)TiO3 single crystals

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yuuki Kitanaka ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Single Crystals ◽  
Remanent Polarization ◽  
Ferroelectric Properties ◽  
Ferroelectric Polarization ◽  
First Principles Calculations ◽  
High Oxygen Pressure ◽  
Piezoelectric Strain ◽  
Top Seeded Solution Growth ◽  
Large Remanent Polarization ◽  
Piezoelectric Strain Constant

AbstractWe report the robust ferroelectric properties of (1 − x)(Bi1/2Na1/2)TiO3–x(Bi1/2K1/2)TiO3 (x = 33%) single crystals grown by a top-seeded solution growth process under a high oxygen-pressure (0.9 MPa) atmosphere. The sample exhibit a large remanent polarization of 48 μC/cm2 and a sizeable piezoelectric strain constant of 460 pm/V. Neutron powder diffraction structural analysis combined with first-principles calculations reveals that the large ferroelectric polarization comparable to PbTiO3 stems from the hybridization between Bi-6p and O-2p orbitals at a moderately negative chemical pressure.

Template-free preparation of mesoporous single crystal In2O3 achieving superior ethanol gas sensing performance

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14615-14619 ◽  
Author(s):  
Jijiang Liu ◽  
Gang Chen ◽  
Yaoguang Yu ◽  
Yalin Wu ◽  
Mingjun Zhou ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Specific Surface ◽  
Single Crystal ◽  
Surface Area ◽  
Gas Sensing ◽  
Vacancy Concentration ◽  
High Specific Surface Area ◽  
Oxygen Vacancy Concentration ◽  
Template Free ◽  
Sensing Performance

Mesoporous single crystal In2O3 with high specific surface area and oxygen vacancy concentration are prepared for enhanced ethanol gas sensing performance.

scholarly journals Combined iDPC and EELS analyses for quantifying oxygen vacancy concentration in LSMO

2021 ◽  
Vol 27 (S1) ◽  
pp. 1196-1197
Author(s):  
Aubrey Penn ◽  
Sanaz Koohfar ◽  
Divine Kumah ◽  
James LeBeau
Keyword(s):  
Oxygen Vacancy ◽  
Vacancy Concentration ◽  
Oxygen Vacancy Concentration

scholarly journals Effects on Microstructure and Ionic Conductivity of the Co-Doping with Strontium and Samarium of Ceria with Constant Oxygen Vacancy Concentration

Solids ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 341-370
Author(s):  
Toby Sherwood ◽  
Richard T. Baker
Keyword(s):  
Oxygen Vacancy ◽  
Grain Boundary ◽  
Vacancy Concentration ◽  
Synthesis Method ◽  
Ionic Conductivities ◽  
Solubility Limit ◽  
Material Structure ◽  
Oxygen Vacancy Concentration ◽  
Co Doping ◽  
Phase Pure

Partially substituted cerias are attractive materials for use as electrolytes in intermediate-temperature solid oxide fuel cells (SOFCs). Ceria doped with Sm or Gd has been found to have high ionic conductivities. However, there is interest in whether doping with multiple elements could lead to materials with higher ionic conductivities. The present study looks at the effects of co-doping Sr and Sm in ceria. A compositional series, Ce0.8+xSm0.2−2xSrxO2−δ (with x = 0–0.08), designed to have a constant oxygen vacancy concentration, was successfully prepared using the citrate–nitrate complexation method. A solubility limit of ~5 cation% Sr was found to impact material structure and conductivity. For phase-pure materials, with increasing Sr content, sinterability increased slightly and intrinsic conductivity decreased roughly linearly. The grain boundaries of phase-pure materials showed only a very small blocking effect, linked to the high-purity synthesis method employed, while at high %Sr, they became more blocking due to the presence of a SrCeO3 impurity. Grain capacitances were found to be 50–60 pF and grain boundary capacitances, 5–50 nF. The variation in the bulk capacitance with Sr content was small, and the variation in grain boundary capacitance could be explained by the variation in grain size. Slight deviations at high %Sr were attributed to the SrCeO3 impurity. In summary, in the absence of deleterious effects due to poor microstructure or impurities, such as Si, there is no improvement in conductivity on co-doping with Sr and Sm.

Magnetic State of Ba-Doped Manganites Depending on the Oxygen Vacancy Concentration

2002 ◽  
Vol 233 (2) ◽  
pp. 321-330 ◽  
Author(s):  
S.V. Trukhanov ◽  
N.V. Kasper ◽  
I.O. Troyanchuk ◽  
H. Szymczak ◽  
K. B�rner
Keyword(s):  
Oxygen Vacancy ◽  
Magnetic State ◽  
Vacancy Concentration ◽  
Oxygen Vacancy Concentration ◽  
Doped Manganites

MECHANISM STUDY ON OXYGEN VACANCY INDUCED RESISTANCE SWITCHING IN Au/LaMnO3/SrNb0.01Ti0.99O3

2013 ◽  
Vol 27 (11) ◽  
pp. 1350074 ◽  
Author(s):  
YU-LING JIN ◽  
ZHONG-TANG XU ◽  
KUI-JUAN JIN ◽  
CHEN GE ◽  
HUI-BIN LU ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
Vacancy Concentration ◽  
Resistance Switching ◽  
Switching Behavior ◽  
Oxygen Vacancy Concentration ◽  
Mechanism Study ◽  
Switching Performance ◽  
Switching Characteristics

Mechanism of resistance switching in heterostructure Au / LaMnO 3/ SrNb 0.01 Ti 0.99 O 3 was investigated. In Au / LaMnO 3/ SrNb 0.01 Ti 0.99 O 3 devices the LaMnO 3 films were fabricated under various oxygen pressures. The content of the oxygen vacancies has a significant impact on the resistance switching performance. We propose that the resistance switching characteristics of Au / LaMnO 3/ SrNb 0.01 Ti 0.99 O 3 arise from the modulation of the Au / LaMnO 3 Schottky barrier due to the change of the oxygen vacancy concentration at Au / LaMnO 3 interface under the external electric field. The effect of the oxygen vacancy concentration on the resistance switching is explained based on the self-consistent calculation. Both the experimental and numerical results confirm the important role of the oxygen vacancies in the resistance switching behavior.

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