The Microstructure and Ferroelectric Properties of Ce-Doped Bi4Ti3O12Thin Films Fabricated by Liquid Delivery MOCVD

2007 ◽  
Vol 44 (8) ◽  
pp. 403-406
Author(s):  
Won-Tae Park ◽  
Dong-Kyun Kang ◽  
Byong-Ho Kim
Keyword(s):  
Ferroelectric Properties ◽  
Liquid Delivery

The Role of Bi 2 O 3 Interfacial Layer in Improvement of Ferroelectric Properties of SrBi 2 Ta 2 O 9 Thin Films Deposited by Liquid-Delivery MOCVD

2002 ◽  
Vol 46 (1) ◽  
pp. 205-214 ◽  
Author(s):  
Nak-Jin Seong ◽  
Woong-Chul Shin ◽  
Eun-Suck Choi ◽  
Sung-Nam Ryoo ◽  
Soon-Gil Yoon
Keyword(s):  
Thin Films ◽  
Interfacial Layer ◽  
Ferroelectric Properties ◽  
Liquid Delivery

Liquid Delivery CVD of Ferroelectric (Pb,La)(Zr,Ti)O3 Thin Films

1994 ◽  
Vol 361 ◽  
Author(s):  
W. Tao ◽  
S.B. Desu ◽  
C.H. Peng ◽  
B. Dickerson ◽  
T.K. Li ◽  
...  
Keyword(s):  
Doping Concentration ◽  
Remanent Polarization ◽  
Ferroelectric Properties ◽  
Reduced Pressure ◽  
La Doping ◽  
Liquid Injection ◽  
Pzt Films ◽  
Direct Liquid Injection ◽  
Titanium Ethoxide ◽  
Liquid Delivery

ABSTRACTHigh quality lanthanum doped PZT films were deposited on platinum coated silicon wafers by direct liquid injection MOCVD using lead bis-tetramethylheptadione, lanthanum tri-tetramethylheptadione, zirconium tetramethylheptadione, and titanium ethoxide as precursors. The films were deposited at 650°C and a reduced pressure of 5 Torr. The deposition rates were higher than 10 nm/min. The liquid delivery system led to highly reproducible deposition rate, composition, and ferroelectric properties in the PLZT films. The remanent polarization of the films decreased from about 25 μC/cm2 for PLZT(0/55/45) to about 12 μC/cm2 for PLZT(8/55/45). The coercive field of the films seemed to be independent on the La doping concentration up to 8% La doping.

Effects of bi2o3 buffer layer on ferroelectric properties of srbi2ta2o9 thin films by liquid-delivery mocvd

2001 ◽  
Vol 36 (1-4) ◽  
pp. 295-304
Author(s):  
Woong Chul Shin ◽  
Kyu Jeong Choi ◽  
Nak Jin Seong ◽  
Soon Gil Yoon
Keyword(s):  
Thin Films ◽  
Buffer Layer ◽  
Ferroelectric Properties ◽  
Liquid Delivery

Epitaxial ferroelectric thin films

1994 ◽  
Vol 52 ◽  
pp. 572-573
Author(s):  
S. G. Ghonge ◽  
E. Goo ◽  
R. Ramesh ◽  
R. Haakenaasen ◽  
D. K. Fork
Keyword(s):  
Single Crystal ◽  
Work Function ◽  
Nonvolatile Memory ◽  
Ferroelectric Properties ◽  
Electrical Contact ◽  
Memory Devices ◽  
Ferroelectric Films ◽  
Si Substrates ◽  
Electro Optic ◽  
Wide Range

Microstructure of epitaxial ferroelectric/conductive oxide heterostructures on LaAIO3(LAO) and Si substrates have been studied by conventional and high resolution transmission electron microscopy. The epitaxial films have a wide range of potential applications in areas such as non-volatile memory devices, electro-optic devices and pyroelectric detectors. For applications such as electro-optic devices the films must be single crystal and for applications such as nonvolatile memory devices and pyroelectric devices single crystal films will enhance the performance of the devices. The ferroelectric films studied are Pb(Zr0.2Ti0.8)O3(PLZT), PbTiO3(PT), BiTiO3(BT) and Pb0.9La0.1(Zr0.2Ti0.8)0.975O3(PLZT).Electrical contact to ferroelectric films is commonly made with metals such as Pt. Metals generally have a large difference in work function compared to the work function of the ferroelectric oxides. This results in a Schottky barrier at the interface and the interfacial space charge is believed to responsible for domain pinning and degradation in the ferroelectric properties resulting in phenomenon such as fatigue.

Effects of LaFeO3 Additions on the Dielectric and Ferroelectric Properties of (K0.5Na0.5)NbO3 Ceramics

2013 ◽  
Vol 27 (11) ◽  
pp. 1228-1232 ◽  
Author(s):  
Hua-Lei CHENG ◽  
Hong-Liang DU ◽  
Wan-Cheng ZHOU ◽  
Fa LUO ◽  
Dong-Mei ZHU
Keyword(s):  
Ferroelectric Properties

An Investigation of the Conductive and Ferroelectric Properties of BZT Films

2020 ◽  
Vol 65 (12) ◽  
pp. 2066-2071
Author(s):  
E. V. Gushchina ◽  
B. R. Borodin ◽  
V. A. Sharov ◽  
V. V. Osipov ◽  
S. I. Pavlov ◽  
...  
Keyword(s):  
Ferroelectric Properties

scholarly journals Composite Ferroelectric Membranes Based on Vinylidene Fluoride-Tetrafluoroethylene Copolymer and Polyvinylpyrrolidone for Wound Healing

Membranes ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Tamara S. Tverdokhlebova ◽  
Ludmila S. Antipina ◽  
Valeriya L. Kudryavtseva ◽  
Ksenia S. Stankevich ◽  
Ilya M. Kolesnik ◽  
...  
Keyword(s):  
Wound Healing ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Composite Membranes ◽  
Modern Medicine ◽  
In Vivo Studies ◽  
Cytotoxic Effects ◽  
Complex Process ◽  
Purulent Wounds

Wound healing is a complex process and an ongoing challenge for modern medicine. Herein, we present the results of study of structure and properties of ferroelectric composite polymer membranes for wound healing. Membranes were fabricated by electrospinning from a solution of vinylidene fluoride/tetrafluoroethylene copolymer (VDF–TeFE) and polyvinylpyrrolidone (PVP) in dimethylformamide (DMF). The effects of the PVP content on the viscosity and conductivity of the spinning solution, DMF concentration, chemical composition, crystal structure, and conformation of VDF–TeFE macromolecules in the fabricated materials were studied. It was found that as PVP amount increased, the viscosity and conductivity of the spinning solutions decreased, resulting in thinner fibers. Using FTIR and XRD methods, it was shown that if the PVP content was lower than 50 wt %, the VDF–TeFE copolymer adopted a flat zigzag conformation (TTT conformation) and crystalline phases with ferroelectric properties were formed. Gas chromatography results indicated that an increase in the PVP concentration led to a higher residual amount of DMF in the material, causing cytotoxic effects on 3T3L1 fibroblasts. In vivo studies demonstrated that compared to classical gauze dressings impregnated with a solution of an antibacterial agent, ferroelectric composite membranes with 15 wt % PVP provided better conditions for the healing of purulent wounds.

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