Effects of grain size on the dielectric properties and tunabilities of sol–gel derived Ba(Zr0.2Ti0.8)O3 ceramics

Tang, Xin‐Gui; Wang, J.; Wang, X.X.; Chan, H.L.W.

doi:10.1016/j.ssc.2004.05.016

Cited by 258 publications

(72 citation statements)

References 19 publications

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“…A 2 hour sintering process leads to BaTi0.8Zr0.2O3 ceramics with diffuse phase transition and with the lowest electrical permittivity maximum amplitude, while 8 hours sintering leads to the least diffuse phase transition and the highest electrical permittivity maximum. * at the interface The grain size dependence of BaTi0.8Zr0.2O3 dielectric properties has been studied by many authors [20][21][22][23][24][25]. Their synthesis methodology and results (average grain size, Tm, T0 and γ) are displayed in Table 3.…”

Section: Methodsmentioning

confidence: 99%

Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties

Amaral

Antonelli

Ochoa

et al. 2016

Ceramics International

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The dielectric, pyroelectric and ferroelectric properties of bilayered BaTiO3/BaTi0.8Zr0.2O3 ceramics are described and correlated with their microstructure. Different sintering times are employed to change the microstructure and promote interdiffusion between the layers. The effects of constrained sintering on both compositions are analyzed and their properties are compared to that of single phase BaTiO3 and BaTi0.8Zr0.2O3 ceramics. The results show that, at sintering times until 2 hours, the bilayer properties are predominantly affected by the presence of residual stresses. Only after 4 hours sintering, the properties are predominantly affected by interdiffusion between the layers.

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Section: Methodsmentioning

confidence: 99%

Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties

Amaral

Antonelli

Ochoa

et al. 2016

Ceramics International

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“…However, there are many causes for size effect in ferroelectrics and it is often difficult to separate true size effect from other factors that change with the size of the system. For instance, the results have been reported in the literature about the size effect in ferroelectric particles associated with the variety of synthesis routes and processing techniques adopted [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of grain size on dielectric and ferroelectric properties of nanostructured Ba0.8Sr0.2TiO3 ceramics

et al. 2015

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Barium strontium titanate (Ba 0.8 Sr 0.2 TiO 3 , BST) nanocrystalline ceramics have been synthesized by high energy ball milling. As the sintering temperature increases from 1200 ℃ to 1350 ℃, the average grain size of BST ceramics increases from 86 nm to 123 nm. The X-ray diffraction (XRD) studies show that these ceramics are tetragonal. The phase and grain size of the sintered pellets have been estimated from the XRD patterns, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The effect of grain size on dielectric and ferroelectric properties is studied. The dielectric and piezoelectric parameters are greatly improved at room temperature with increase in grain size. The Curie transition temperature is found to shift slightly towards higher temperatures as the grain increases from 86 nm to 123 nm. The coercive field decreases and the remnant polarization and spontaneous polarization increase as the grain size of BST nano ceramics increases. These ceramics are promising materials for tunable capacitor device applications.

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“…This behavior is in good agreement with previous results by FESEM measurements that BZT thin film with 20-nm thickness seed layer reached a maximum in average grain size. Internal compressive stress occurs to a lesser extent in thin films with larger grains because of the lower concentration of grain boundaries and the direct effect of compressive stress may be the shift of the ionic positions in a unit cell and this causes the change in polarization, while the compressive stress decreases the dielectric constant of thin films [16,17]. Figure 5 shows the leakage current-electric field characteristics of BZT thin films at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Effect of seed layers on dielectric properties of Ba(Zr0.3Ti0.7)O3 thin films

2007

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The Barium zirconium titanate Ba(Zr 0.3 Ti 0.7 )O 3 thin films were prepared on Pt/Ti/SiO 2 /Si substrates with seed layers at the BZT/Pt interface by sol-gel process. Microstructure and structure of thin films were examined. Dielectric properties of thin films with various seed layers thicknesses were investigated as a function of frequency and direct current electric field. The tunability and dielectric constant of BZT thin films increased with increasing seed layer thickness from 0 to 20 nm, while it decreased with a further increase in thickness above 20 nm, meanwhile, the leakage current showed the similar tendency at applied electric field of 250 kV/cm. The optimized seed layer thickness for BZT thin films plays an important role in maintaining the high tunability and low leakage current, which are suitable for microwave device applications.

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Effects of grain size on the dielectric properties and tunabilities of sol–gel derived Ba(Zr0.2Ti0.8)O3 ceramics

Cited by 258 publications

References 19 publications

Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties

Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties

Effect of grain size on dielectric and ferroelectric properties of nanostructured Ba0.8Sr0.2TiO3 ceramics

Effect of seed layers on dielectric properties of Ba(Zr0.3Ti0.7)O3 thin films

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