Two methods of coercive field and spontaneous polarization determination based on dielectric hysteresis loop measurements

1995 ◽  
Author(s):  
Mariusz Trybus ◽  
Wladyslaw Proszak
Keyword(s):  
Hysteresis Loop ◽  
Spontaneous Polarization ◽  
Coercive Field ◽  
Dielectric Hysteresis Loop

Ferroelectric properties in Mn-modified BiFeO3–BaTiO3 ceramics

2014 ◽  
Vol 07 (01) ◽  
pp. 1350074 ◽  
Author(s):  
Zhonghua Dai ◽  
Yukikuni Akishige
Keyword(s):  
Spontaneous Polarization ◽  
Coercive Field ◽  
Remnant Polarization ◽  
Applied Field ◽  
Ferroelectric Properties ◽  
Relaxor Ferroelectrics ◽  
Annealed Sample ◽  
Dielectric Dispersion ◽  
Dc Resistivity ◽  
Ceramic Process

Multiferroic 0.4 mol%- MnO 2-doped 0.78 BiFeO 3–0.22 BaTiO 3 ceramics were prepared by a traditional ceramic process. The effects of doping and annealing on the dielectric and ferroelectric properties were intensively investigated. Dielectric dispersion like relaxor ferroelectrics was observed in the oxygen annealed sample, but disappeared in the vacuum annealed sample. Modification of the BiFeO 3– BaTiO 3 with MnO 2 and annealing in vacuum improved DC resistivity obviously. The spontaneous polarization, remnant polarization, and coercive field are 65.2 μC/cm2, 59.5 μC/cm2 and 21.9 kV/cm, respectively under an applied field of 35 kV/cm.

Dielectric Hysteresis Loop in Alicyclic and Aromatic Polyamides

1994 ◽  
Vol 33 (Part 2, No. 3A) ◽  
pp. L354-L356 ◽  
Author(s):  
Yukinobu Murata ◽  
Kenji Tsunashima ◽  
Naokazu Koizumi
Keyword(s):  
Hysteresis Loop ◽  
Dielectric Hysteresis Loop ◽  
Aromatic Polyamides

Metallorganic Cheamcal Vapor Deposition (Mocvd) of Titanium-Based Ferroelectric Thin Films

1993 ◽  
Vol 310 ◽  
Author(s):  
Warren C. Hendricks ◽  
Seshu B. Desu ◽  
Jie Si ◽  
Chien H. Peng
Keyword(s):  
Lead Zirconate Titanate ◽  
Vapor Deposition ◽  
Spontaneous Polarization ◽  
Coercive Field ◽  
Lead Titanate ◽  
Ferroelectric Properties ◽  
Chemical Vapor ◽  
Lead Zirconate ◽  
Transparent Films ◽  
Titanium Ethoxide

AbstractUsing hot-walled metallorganic chemical vapor deposition (MOCVD), thin fihns of lead zirconate titanate (PZT), lead titanate (PbTiO3 or PT) and bismuth titanate (Bi4Ti3O12 or BiT) were successfully prepared. For each material, titanium ethoxide (Ti(C2H5O)4) was used as the precursor for the titanium source, while lead bis-tetramethylheptadione (Pb(thd)2), zirconium tetrakistetramethylheptadione (Zr(thd)4) and triphenyl bismuth (Bi(C6H5)3) were used as sources for lead, zirconium and bismuth, respectively. Dense, specular and highly transparent films were obtained for all three materials. Deposition conditions are given for each of the materials as well as the properties of the resulting films as determined by XRD, SEM and UV-VIS-NIR spectrophotometry. Ferroelectric properties are also given for the PZT and BiT films; for PZT (%Zr = 41; %Ti = 9) annealed at 600 °C, the spontaneous polarization, Ps, was 23 μC/cm2 and the coercive field, Ec, was 65 kV/cm; for BiT annealed at 550 °C, the spontaneous polarization, Ps, was 27 μC/cm2 and the coercive field, Ec, was 240 kV/cm.

STUDIES ON ORIENTED DOMAIN POLYSTYRENE-TGS COMPOSITE FILMS

1995 ◽  
Vol 09 (17) ◽  
pp. 1039-1044
Author(s):  
S.C. MATHUR ◽  
D.S. RAWAT ◽  
H.O. YADAV ◽  
D.C. DUBE ◽  
A.S. BHALLA
Keyword(s):  
Dielectric Constant ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
Domain Structure ◽  
Spontaneous Polarization ◽  
Coercive Field ◽  
Composite Films ◽  
Microwave Frequency ◽  
Ferroelectric Films ◽  
Microwave Frequencies

Polymer ferroelectric films were prepared by dispersing TGS powder in polystyrene. Permittivity versus temperature plots exhibit a peak at around the transition temperature of TGS. The peak gets suppressed with increasing frequency and the trend continues up to microwave frequencies. We observed that the dielectric constant of films at microwave frequency stays close to the dielectric constant of polystyrene. The domain structure of TGS crystals essentially seems to affect their dielectric properties. Single domain films exhibit a higher spontaneous polarization and a higher coercive field.

Tuning of magnetic properties of the 2D CN-bridged NiII–NbIV framework by incorporation of guest cations of alkali and alkaline earth metals

2021 ◽  
Author(s):  
Michał Heczko ◽  
Mateusz Reczyński ◽  
Christian Näther ◽  
Beata Nowicka
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Coercive Field ◽  
Alkaline Earth ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Alkaline Earth Metals

The coercive field of the magnetic hysteresis loop of the 2D microporous honeycomb-like Ni–Nb network decreases with the increasing number and size of the s-block metal guest cations.

Large Spontaneous Polarization and Clear Hysteresis Loop of a Room-Temperature Hybrid Ferroelectric Based on Mixed-Halide [BiI3Cl2] Polar Chains and Methylviologen Dication

2011 ◽  
Vol 133 (38) ◽  
pp. 14924-14927 ◽  
Author(s):  
Nicolas Leblanc ◽  
Nicolas Mercier ◽  
Leokadiya Zorina ◽  
Sergey Simonov ◽  
Pascale Auban-Senzier ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Spontaneous Polarization ◽  
Room Temperature

Influence of the Waveform and DC Offset on the Asymmetric Hysteresis Loop in Au/PZT/Pt/Al2O3/SiO2/Si Thin Films Prepared by MOCVD Method

2013 ◽  
Vol 467 ◽  
pp. 155-159
Author(s):  
Masruroh
Keyword(s):  
Thin Films ◽  
Hysteresis Loop ◽  
Coercive Field ◽  
Bottom Electrode ◽  
Wave Type ◽  
Peak Voltage ◽  
Dc Offset

In this paper, the hysteresis loop of Au/PZT/Pt/Al2O3/SiO2/Si thin films was experimentally measured in different conditions as a waveform and a DC offset, using a precision LC Radiant technology RT-66. The measurements were taken by applying a drive to the Pt bottom electrode connected to the drive of the precision LC and the Au top electrode was connected to the drive of the precision LC. The waveform was applied as wave type = sine; peak voltage = 6 V; frequency = 1 KHz and duration = 100 s. The results show that, by applying waveform and DC offset the hysteresis loop softly changes the polarization (Pr) and coercive field (Vc).

scholarly journals Effect of bismuth substitution on magnetic properties of CoFe2O3 nanoparticles: Study of synthesize using coprecipitation method

2019 ◽  
Vol 3 (1) ◽  
pp. 9
Author(s):  
Didik Eko Saputro ◽  
Utari Utari ◽  
Budi Purnama
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Saturation Magnetization ◽  
Coercive Field ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Coprecipitation Method ◽  
Ion Concentration ◽  
Cobalt Ferrite Nanoparticles ◽  
Ion Substitution

<strong><span lang="EN-US">Abstract:</span></strong><span lang="EN-US"> The effect of bismuth ion substitution on the magnetic properties of cobalt ferrite nanoparticles was identified in this study. This method used in this study was coprecipitation method using 0.1 bismuth ion concentration. The results on hysteresis loop showed that the saturation magnetization of cobalt ferrite nanoparticles decreased with the substitution of bismuth ions, but the coercive field experienced the opposite. Saturation magnetization decreased from 57.97 to 51.19 emu / g, while coercive fields increased from 0.64 to 0.84 kOe.</span>

scholarly journals Influence of texture on the switching behavior of Pb(Zr0.70Ti0.30)O3 sol-gel derived thin films

1997 ◽  
Vol 12 (2) ◽  
pp. 531-540 ◽  
Author(s):  
Keith G. Brooks ◽  
Radosveta D. Klissurska ◽  
Pedro Moeckli ◽  
N. Setter
Keyword(s):  
Thin Films ◽  
Spontaneous Polarization ◽  
Coercive Field ◽  
Sol Gel ◽  
Switching Behavior ◽  
Fatigue Properties ◽  
Saturation Polarization ◽  
Second Phases ◽  
Fatigue Characteristics ◽  
Switching Characteristics

Rhombohedral Pb(Zr0.70Ti0.30)O3 thin films of four different well-defined textures, namely, (100), (111), bimodal (110)/(111), and (100)/(111), were prepared by a sol-gel method. The films were characterized in terms of grain size, presence of second phases, surface roughness, columnarity of grains, and other microstructural features. The dielectric, ferroelectric, and fatigue properties were investigated, with emphasis on the hysteresis switching characteristics. Results are discussed from the reference point of the allowable spontaneous polarization directions available for the different textures. The values of coercive field, remanent and saturation polarization, and slope of the loop at the coercive field, at saturating fields can be qualitatively explained based on the texture, independent of microstructural differences. The occurrence of surface pyrochlore, however, is observed to affect the functionality of the saturation curves, particularly for the samples of bimodal texture. Shearing of the hysteresis curves of the bimodal films is also attributed to surface microstructural features. The occurrence of nonswitching 71° or 109° domains in the (111) and (110)/(111) textured films is hypothesized based on a comparison with the data from the (100) textured film. Corrected saturation polarization values agree with the spontaneous polarization values of rhombohedral PZT single crystals and published calculated values for rhombohedral PZT ceramics. The fatigue characteristics show increases in the switching component of polarization in the range 103−107 bipolar cycles, particularly for the (111) textured sample. Onset of fatigue is observed for all samples between 107 and 108 switching cycles.

Sign in / Sign up

Export Citation Format

Share Document