High-Resolution Optical Microscopy Of BaXSr1−xTio3 Films

1997 ◽  
Vol 493 ◽  
Author(s):  
C. Hubert ◽  
J. Levy ◽  
A. C. Carter ◽  
W. Chang ◽  
J. M. Pond ◽  
...  
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Optical Microscopy ◽  
Hysteresis Loops ◽  
Laser Deposition ◽  
Ac Electric Field ◽  
Ferroelectric Domain Structure ◽  
Dc Electric Field ◽  
Confocal Scanning ◽  
Scanning Optical Microscopy

ABSTRACTThe ferroelectric polarization of thin films of BaxSr1−xTiO3 is imaged using confocal scanning optical microscopy (CSOM). The thin films are grown by pulsed laser deposition (PLD) on SrTiO3 substrates. Ferroelectric domain structure is imaged by applying a small ac electric field across interdigitated electrodes, and measuring induced reflectivity changes in the film, which are directly related to the polarization. Domain re-orientation is observed by acquiring CSOM images as a function of the dc electric field. Local hysteresis loops are obtained by sweeping the dc electric field at fixed positions on the sample. Micrometer-sized regions exhibit both ferroelectric and paraelectric response, indicating that thermal broadening of the phase transition is largely due to inhomogeneities in the thin films.

Confocal scanning optical microscopy of BaxSr1−xTiO3 thin films

1997 ◽  
Vol 71 (23) ◽  
pp. 3353-3355 ◽  
Author(s):  
Charles Hubert ◽  
Jeremy Levy ◽  
Adrian C. Carter ◽  
Wontae Chang ◽  
Steven W. Kiechoefer ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Microscopy ◽  
Confocal Scanning ◽  
Scanning Optical Microscopy

Shape of piezoelectric hysteresis loop for non-ferroelastic switching

2003 ◽  
Vol 784 ◽  
Author(s):  
A. K. Tagantsev ◽  
P. Muralt ◽  
J. Fousek
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Hysteresis Loop ◽  
Single Crystals ◽  
Applied Electric Field ◽  
Piezoelectric Coefficient ◽  
Hysteresis Loops ◽  
Simple Theory ◽  
The Difference

ABSTRACTA simple theory for the shape of the piezoelectric hysteresis loops (piezoelectric coefficient d vs. applied electric field E) is developed for the case of non-ferroelelastic 180° switching in ferroelectrics. The theory provides explanations for specific features of piezoelectric hysteresis loops, which have been observed in single crystals, thin films and in ceramics in particular. The piezoelectric coefficient may show a “hump”, i.e. when E decreases from the tip of the loop down to zero, d passes through a maximum, and a “nose”, i.e. a self-crossing of the loop close to its tips. The theory also explains the difference in the coercive fields seen in the polarization and piezoelectric loops.

The Distinguishing Quality of Water Droplets on Insulating Surface under AC and DC Electric Field Stress

2014 ◽  
Vol 1025-1026 ◽  
pp. 803-808
Author(s):  
Sackthavy Chandavong ◽  
Kittipong Tonmitr ◽  
Arkom Kaewrawang
Keyword(s):  
Electric Field ◽  
Water Droplets ◽  
Insulating Material ◽  
Field Stress ◽  
Ac Electric Field ◽  
Quality Of Water ◽  
Electric Field Direction ◽  
Surface Breakdown ◽  
Dc Electric Field

This paper presents the comparison of water droplets on insulating surface under alternating current (AC) and direct current (DC) electric field. Besides that, it is demonstrated about the insulator deterioration under both electric field stressed due to an ageing and partial discharge (PD) phenomenon. The vital parameters factors are water droplets conductivity, droplet volume, surface roughness and droplet positioning that they cause to occur the electric field intensification. The field is intensified at the interface between the droplet, air and insulating material. Thus, the PD occurred due to electric field intensification increases with the deformed droplet. The deformation of water droplet under AC electric field stress is more intense than DC field. The electrostatic forces change the droplet shapes and spread them along the electric field direction. The local electric field intensification provokes the PD giving way to reduction of hydrophobicity of insulator surfaces. In addition, the PD activity could appear as a trigger for a surface breakdown. And the localized arcs cause damage to insulating material then finally leads to deterioration of insulation materials and the pollutant contamination.

Excimer laser deposition of c-axis oriented Pb(Zr, Ti)O3 thin films on silicon substrates with direct-current glow discharge

1997 ◽  
Vol 12 (5) ◽  
pp. 1179-1182 ◽  
Author(s):  
Lirong Zheng ◽  
Xuhong Hu ◽  
Pingxiong Yang ◽  
W-ping Xu ◽  
Chenglu Lin
Keyword(s):  
Thin Films ◽  
Glow Discharge ◽  
Direct Current ◽  
Substrate Surface ◽  
Hysteresis Loops ◽  
Deposition Process ◽  
Discharge Voltage ◽  
Laser Deposition ◽  
Silicon Substrates ◽  
Ferroelectric Hysteresis

Ferroelectric thin films of Pb(Zr, Ti)O3 (PZT) were fabricated on platinum-coated silicon using the process of direct-current glow discharge assisted laser deposition, where the substrate was electrically grounded. The films deposited at 730 °C with +800 V discharge voltage are oriented mostly with the c-axis perpendicular to the substrate surface, and exhibit good ferroelectric hysteresis loops. A possible mechanism for the improvement of the deposition process has been proposed.

scholarly journals Optical nanowriting on azobenzene side-chain polymethacrylate thin films by near-field scanning optical microscopy

2003 ◽  
Vol 82 (19) ◽  
pp. 3313-3315 ◽  
Author(s):  
V. Likodimos ◽  
M. Labardi ◽  
L. Pardi ◽  
M. Allegrini ◽  
M. Giordano ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Microscopy ◽  
Near Field ◽  
Side Chain ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning
Sign in / Sign up

Export Citation Format

Share Document