scholarly journals Effect of BaTiO3 on the Properties of PVC-Based Composite Thick Films

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5430
Author(s):  
Sarir Uddin ◽  
Naheed Akhtar ◽  
Sumbal Bibi ◽  
Abid Zaman ◽  
Asad Ali ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Material ◽  
Thick Films ◽  
Ceramic Powder ◽  
Composite Films ◽  
Frequency Dispersion ◽  
Solution Casting Method ◽  
Constant Versus ◽  
Two Phases

Flexible PVC/BT (Polyvinyl chloride/Barium Titanate) composite thick films with (0–30%) volume fractions of BaTiO3 were fabricated via the solution casting method. The effects of BaTiO3 filler on the phase, microstructure and dielectric properties of composite films were investigated. The XRD results revealed that BT particles are embedded in the PVC matrix with no chemical reaction taking place between the two phases. It was observed that the glass transition temperature of PVC had increased with the addition of BT. The frequency dispersion in the dielectric constant versus temperature curves indicated the relaxor nature of the composites. The dielectric constant (εr) measured at 40 °C, increased from 7.6 for pure PVC to 16.1 for 30% of BaTiO3 content in PVC polymer matrix. It is suggested that BaTiO3 ceramic powder enhanced the dielectric properties of PVC and may be used as a flexible dielectric material.

scholarly journals Crystallization and Dielectric Properties of MWCNT /Poly(1-Butene) Composite Films by a Solution Casting Method

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 755
Author(s):  
Lingfei Li ◽  
Qiu Sun ◽  
Xiangqun Chen ◽  
Yongjun Xu ◽  
Zhaohua Jiang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Breakdown Strength ◽  
Composite Films ◽  
Conductive Filler ◽  
Interfacial Polarization ◽  
Solution Casting ◽  
Casting Method ◽  
Solution Casting Method

In this work, poly(1-butene) (PB-1) composite films with multi-walled carbon nanotubes (MWCNT) were prepared by a solution casting method. The relationship between the dielectric properties and the crystal transformation process of the films was investigated. It was indicated that there were two crystal forms of I and II of PB-1 during the solution crystallization process. With the prolongation of the phase transition time, form II was converted into form I. The addition of the conductive filler (MWCNT) accelerated the rate of phase transformation and changed the nucleation mode of PB-1. The presence of crystal form I in the system increased the breakdown strength and the dielectric constant of the films and reduced the dielectric loss, with better stability. In addition, the dielectric constant and the dielectric loss of the MWCNT/PB-1 composite films increased with the addition of MWCNT, due to the interfacial polarization between MWCNT and PB-1 matrix. When the mass fraction of the MWCNT was 1.0%, the composite film had a dielectric constant of 43.9 at 25 °C and 103 Hz, which was 20 times that of the original film.

Dielectric Properties of CCTO/PVDF Composite Films

2013 ◽  
Vol 816-817 ◽  
pp. 276-279 ◽  
Author(s):  
Fang Fang Wang ◽  
Ya Jun Wang ◽  
Zhi Bo Ren
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Composite Films ◽  
Solution Casting ◽  
Casting Method ◽  
Impedance Analyzer ◽  
Composite Models ◽  
Solution Casting Method ◽  
Pvdf Matrix ◽  
Ccto Powder

To meet the requirement of microelectronic industry, ceramic/polymer composite films made of CaCu3Ti4O12(CCTO) powder as filler and PVDF copolymer as matrix were prepared by solution casting method. The dielectric properties (DP) and morphology of the films were studied by impedance analyzer and scanning electron microscope (SEM) respectively. The dielectric constant could reach 23.96 and loss 0.1082 when mass fraction of CCTO is 50% at 100 Hz. SEM results show that CCTO particles dispersed well in the PVDF matrix. At last, three composite models were used to predict the dielectric constant of the composite films and it is proved that Yamada model fits the experimental data well.

Dielectric Properties of 0.9PMNTa-0.1PT Relaxor

2000 ◽  
Author(s):  
Feng Tang ◽  
Jin T. Wang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Test Chamber ◽  
Frequency Dispersion ◽  
Relaxor Behavior ◽  
Lead Magnesium ◽  
Constant Versus ◽  
Lower Temperature ◽  
Ta Doping

Abstract Ta-Modified lead magnesium niobate-lead titanate crystalline solutions 0.9PbMg1/3(Nb(1−x)Tax)2/3O3-0.1PbTiO3 (PMN-PT) were first synthesized. The dielectric constant and the dielectric loss of the ceramic for different compositions as a function of frequency and temperature were measured using a Hewlett Packard 4284A LCR precision meter, which can cover a frequency range from 20 to 106Hz in a Delta 9039 test chamber operated between −75°C to +330°C. Dramatic changes of the dielectric properties were observed in Ta-modified 0.9PMN-0.1PT. It was noticed that the samples with appropriate amount of Ta-doping (x = 0.1, 0.2, and 0.3) have smaller grain size, larger dielectric constant, and lower dielectric loss than those of the specimens without doping (x = 0.0) or over doping (x = 1.0) in the frequency band of 100 – 105Hz. Proper Ta-doping in PMN-PT also resulted in a weaker frequency dispersion. It was also found that with increasing of Ta addition x, the transition temperature shifts downward to the lower temperature and the peaks of the dielectric constant versus temperature are getting sharper. Ta-doped PMNTa-PT shows a typical relaxor behavior.

DIELECTRIC PROPERTIES OF POLY (VINYLIDENE FLUORIDE)/BARIUM TITANATE NANOCOMPOSITES UNDER GAMMA IRRADIATION

2019 ◽  
Vol 184 (3-4) ◽  
pp. 342-346
Author(s):  
K Waree ◽  
K Pangza ◽  
N Jangsawang ◽  
P Thongbai ◽  
S Buranurak
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Gamma Irradiation ◽  
Nanocomposite Film ◽  
Gamma Ray ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Composite Films ◽  
Significant Difference ◽  
Accumulated Dose

Abstract The main focus of this study is to investigate the effect of gamma irradiation on the electrical properties of PVDF/BT nanocomposites. A 1.25 MeV gamma-ray was delivered to the composite films with different BaTiO3-volume fraction, ƒBT = 0–0.4, and with different absorbed doses ranged 50–2500 Gy. Dielectric properties of PVDF/BaTiO3 composites under frequencies ranged from 100 Hz to 10 MHz at room temperature were investigated using an impedance analyser. An increase of 28% in the dielectric constant and a decrease of 15% in the loss tangent were observed in the PVDF/BT 40 vol% nanocomposite film under the accumulated dose of 1500 Gy. Scanning electron microscopy provided no significant difference in microscopic structures between non-exposed and gamma-exposed materials. Fourier-transform infra-red spectroscopy provides gamma-induced transition of PVDF-crystalline forms as alpha-PVDF into beta-PVDF/gamma-PVDF which has been reported as one of the main factors affected the change of dielectric constant in polymers. UV–visible spectrophotometry has been observed gamma-induced red shift in the absorption edge of the PVDF/BT 40 vol% nanocomposite film from 400 nm to 420 nm under the accumulated dose of 1500 Gy. However, a blue shift is observed with increase the accumulated dose up to 2000 Gy.

A New Dielectric Material System of xLa(Mg1/2Ti1/2) O3−(1−X) CaTiO3 at Microvave Frequency

2003 ◽  
Vol 783 ◽  
Author(s):  
Yuan-Bin Chen ◽  
Cheng-Liang Huang ◽  
Che-Win Row
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Material ◽  
Material System ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Phase Effect ◽  
Temperature Coefficients ◽  
Solid State Route ◽  
Conventional Solid State Route

ABSTRACTThe dielectric properties and the microstructures of xLa(Mg1/2Ti1/2)O3−(1−x)CaTiO3 ceramics with B2O3 additions (0.25wt%) prepared with conventional solid-state route have been investigated. Doping with B2O3 (0.25wt%) can effectively promote the densification and the dielectric properties of xLa(Mg1/2Ti1/2)O3−(1−x)CaTiO3 ceramics. It is found that xLa(Mg1/2Ti1/2)O3−(1−x)CaTiO3 ceramics can be sintered at 1400°C due to the liquid phase effect of B2O3 addition observed by Scanning Electronic Microscopy. At 1425°C, 0.5La(Mg1/2Ti1/2)O3−0.5CaTiO3 ceramics with 0.25 wt% B2O3 addition possesses a dielectric constant (εr) of 43, a Q×f value of 24470 (at 8GHz) and a temperature coefficients of resonant frequency (τf) of -8.94 ppm/°C. As an increasing the content of La(Mg1/2Ti1/2)O3, the highest Q×f value of 30824(GHz) could be achieved for X=0.7.

Effect of Sr/Ba Ratio on Dielectric Properties of BSTN Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 125-128 ◽  
Author(s):  
Zong Hui Zhou ◽  
Xin Cheng ◽  
Pi Yi Du ◽  
Jun Chang ◽  
Shi Feng Huang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Perovskite Phase ◽  
Tungsten Bronze ◽  
Dielectric Constants ◽  
Composite Ceramics ◽  
Impedance Analyzer ◽  
Applied Frequency ◽  
Two Phases

The phase composition of (1-x)BaO·xSrO·0.7TiO2·0.3Nb2O5 (BSTN) composite ceramics was analyzed by XRD, and the effect of Sr/Ba ratio on the dielectric properties of BSTN was investigated by impedance analyzer. The results showed that any sample with different x value contained two phases-the perovskite phase and the tungsten bronze phase. The dielectric constants of BSTN basically decreased while the tanδ increased with the increase in x value. Both dielectric constant and tanδ decreased with the applied frequency increased for the same x value. There were two Curie points for BSTN composite ceramics. The first one belonging to the perovskite phase decreased with the increase in x value, but the second one belonging to the tungsten bronze phase kept almost constant at about 300°C.

Epoxy-Based Dielectric Materials for Solid Insulator: Preparation, Dielectric Properties, and Breakdown Performance

2013 ◽  
Vol 798-799 ◽  
pp. 197-200
Author(s):  
Nan Li ◽  
Wei Deng ◽  
Hui Gang Sun
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Epoxy Matrix ◽  
Breakdown Strength ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
The Other ◽  
Mixing Ratio ◽  
Solid Insulator ◽  
Polymeric Samples

In this article, epoxy-based dielectric materials for solid insulator were investigated. First, epoxy-based polymeric samples with different permittivities were prepared by incorporating a mixture of two fillers (Al2O3 and SrTiO3) into epoxy matrix. Then, dielectric properties were characterized for the epoxy-based samples by using a dielectric spectrometer with varied frequency. Finally, breakdown tests were performed under AC voltage to characterize the breakdown strength of the dielectric material. Results indicated that the permittivity (dielectric constant) of epoxy-based materials can be adjusted only by changing the mixing ratio of two types of fillers. On the other hand, the obtained dielectric materials showed acceptable breakdown strength with the present amounts of fillers.

Dielectric Properties of Ba0.5Sr0.5TiO3-P(VDF-CTFE) Nanocomposites

2007 ◽  
Vol 1034 ◽  
Author(s):  
Peixuan Wu ◽  
Xiaobing Shan ◽  
Zhong-yang Cheng
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Polymer Composite ◽  
Ceramic Powder ◽  
Weak Dependence ◽  
Broad Temperature Range ◽  
Maximum Temperature ◽  
Temperature Range ◽  
Constant Maximum

AbstractCeramic/polymer composite made of nanosize Ba0.5Sr0.5TiO3 (BST) powders and P(VDF-CTFE) copolymers as matrix. The concentration of the composites with BST from 0% to 50% in volume was investigated. The dielectric properties and structure as well as the morphology of the composites were characterized over a broad temperature range. It is found that the wetability between the polymer and ceramic powder is not good. The approach to improve the uniformity of composites was investigated. Due to the dielectric-constant-maximum temperature of the BST is different from that of copolymer, a weak dependence of the dielectric constant on temperature was observed over temperature from 10 °C to 100 °C.

Study of Ac Conductivity and Dielectric Properties of PMMA with Fe2O3+ Al2O3 Composite Films

2013 ◽  
Vol 209 ◽  
pp. 14-17
Author(s):  
Basavaraja Sannakki ◽  
Anita Gandhe ◽  
V.H. Doddamani
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Polymer Composite ◽  
Composite Films ◽  
Weight Percent ◽  
X Ray ◽  
Morphological Studies ◽  
Tan Δ ◽  
Al2o3 Films

Abstract. The PMMA with Fe2O3+ Al2O3 films at different weight percent have been used for measurement of dielectric properties such as dielectric constant, dielectric loss and a. c. conductivity as a function of frequency over the range 50 Hz – 5 MHz at room temperature. The dielectric constant and the dielectric loss (tan δ) of the polymer composite films decreases exponentially at lower frequencies over the range 100 Hz-1 kHz, where as above 1 kHz the values of dielectric constant remains same. But, it has been observed that the value of dielectric constant of PMMA composite films with Fe2O3+ Al2O3 increases as weight percent of Fe2O3+ Al2O3 increases. The a c conductivity of the polymer composite films remains constant over the frequency range 50 Hz to 300 K Hz and afterwards it increases exponentially. Further, PMMA with Fe2O3+ Al2O3 have been characterized using X-Ray diffractometer for the crystallinity. The morphological studies have been made using the FESEM.

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.

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