Synthesis and dielectric properties of a new class of MX6Ti6O19 (M=Ba, Sr and Ca; X=Mg and Zn) ceramics

Preethi, T.; Ratheesh, R.

doi:10.1016/s0167-577x(02)01309-5

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…Henning and colleagues 18 reported that the increase in the grain size results in distinct enhancement of the dielectric constant in BaTiO 3 materials. On the other hand, Preethi et al 19 . reported that the distortion of the crystalline lattice with respect to a decrease in the ionic radii might also be the reason for the increase in the dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Properties and Reliability of Zn_0.95Mg_0.05TiO₃+0.25TiO₂ MLCCs with Different Pd/Ag Ratios of Electrodes

Lee

2010

Int J Applied Ceramic Tech

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In order to study the micromechanism of silver migration that influences the dielectric properties and reliability of Zn0.95Mg0.05TiO3+0.25TiO2 (ZMT″) with 1 wt% 3ZnO–B2O3 multilayer ceramic capacitors (MLCCs), various silver (Ag)–palladium (Pd) ratios of conductors were used as inner electrodes. It was found that the electrical resistance of a MLCC sample with pure Ag as inner electrodes was degraded drastically to compared with the Ag/Pd inner electrodes at measuring temperatures ranging from 25°C to 175°C. It may be explained that the pure Ag migrates easily into the dielectric layer along the grain boundary during co‐firing. The ZMT″ MLCCs exhibited increasing dielectric constant and insulation resistance considerably with increasing sintering temperature. Moreover, the results also indicate that Ag diffusion changes the dielectric properties and decreases the breakdown voltage. A ZMT″ MLCC with a high Ag content in the inner electrode exhibits poor reliability, and the effect of Ag+ migration is markedly enhanced when the activation energy of the ZMT″ dielectric is considerably lowered due to the excessive formation of oxygen vacancies and the semiconducting Zn2TiO4 phase when Ag+ substitutes for Zn2+ during co‐firing.

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Section: Resultsmentioning

confidence: 99%

Dielectric Properties and Reliability of Zn_0.95Mg_0.05TiO₃+0.25TiO₂ MLCCs with Different Pd/Ag Ratios of Electrodes

Lee

2010

Int J Applied Ceramic Tech

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“…In contrast, two phases exist for BST doped with CuO, and a decrease in dielectric constant is mainly associated with the formation of the second phase, a Cu‐rich phase that has a lower dielectric constant in comparison with that of BST. According to Lichtenecker's rule 24 for calculating the dielectric constant of two mixed dielectrics, where θ, is the fraction of volume of dielectrics that can be derived when the dielectric constant of composite is measured. …”

Section: Resultsmentioning

confidence: 99%

Effects of CuO Doping on the Microstructural and Dielectric Properties of Ba_0.6Sr_0.4TiO₃ Ceramics

Lee

Huang

2009

Journal of the American Ceramic Society

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This study investigates the effect of CuO on the sintering behavior, dielectric properties, and microstructures of Ba0.6Sr0.4TiO3 (BST) ceramics. The ceramics were sintered in air at temperatures ranging from 1000° to 1230°C. It is found that a small amount of added CuO (0.6 mol%) can significantly increase the density and improve the dielectric properties of BST ceramics. Doped BST ceramics can be sintered to a density >95% of the theoretical density at 1150°C. scanning electron microscopic observations show that the BST grain sizes increase with increasing amounts of CuO. No secondary phases in the BST ceramics are observed using X‐ray diffraction pattern for CuO additions up to 0.9 mol%. However, compositional analysis using transmission electron microscopy‐EDX for the BST ceramics with 0.9 mol% CuO sintered at 1150°C showed that a small level of secondary phase formation is present. On the other hand, large dislocations are observed for BST with 0.6 mol% CuO addition as a result of lattice distortion, which creates the vacancy condensation because of the atomic mismatch in the solid solutions. Optimal CuO doping concentrations can reduce the loss tangents of BST that can also ensure a high dielectric constant. When the doping concentration of CuO is 0.6 mol% and the ceramic is sintered at 1150°C, the BST ceramic has the following properties at 1 MHz: dielectric constant=4094, tan δ=0.55%.

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“…On the other hand, the relative content of the second‐phase BaMg 6 Ti 6 O 19 is increased and that of BZT in composite ceramics is decreased with the increase of MgTiO 3 . BZT is a typical ferroelectric relaxor and BaMg 6 Ti 6 O 19 is a kind of microwave dielectric material. 12,13 The ferroelectric relaxation behavior of MgTiO 3 ‐doped BZT composite ceramics is weakened due to the decrease of BZT and the increase of BaMg 6 Ti 6 O 19 .…”

Section: Resultsmentioning

confidence: 99%

Relaxor Behavior and Dielectric Properties of MgTiO₃‐Doped BaZr_0.35Ti_0.65O₃ Composite Ceramics for Tunable Applications

Chou

Zhai

Yao

2007

Journal of the American Ceramic Society

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MgTiO3‐doped BaZr0.35Ti0.65O3 (BZT) composite ceramics have been prepared by the conventional solid‐state route. The dielectric nonlinear characteristics and relaxor behavior of these composite ceramics have been investigated. The secondary‐phase BaMg6Ti6O19 is formed among BZT composite ceramics with the increase of MgTiO3. BZT composite ceramics show typical diffuse phase transition characteristic and ferroelectric relaxor behavior. The dielectric constant of BZT composite ceramics can be tailored from thousands to hundreds by manipulating the addition of MgTiO3. The dielectric loss still keeps around 0.001 and the tunability is above 20% at a dc‐applied electric field of 25 kV/cm. Suitable dielectric constant, low dielectric loss, and high tunability of this kind of composite ceramics can be useful for potential microwave tunable applications.

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Synthesis and dielectric properties of a new class of MX6Ti6O19 (M=Ba, Sr and Ca; X=Mg and Zn) ceramics

Cited by 12 publications

References 12 publications

Dielectric Properties and Reliability of Zn_0.95Mg_0.05TiO₃+0.25TiO₂ MLCCs with Different Pd/Ag Ratios of Electrodes

Dielectric Properties and Reliability of Zn_0.95Mg_0.05TiO₃+0.25TiO₂ MLCCs with Different Pd/Ag Ratios of Electrodes

Effects of CuO Doping on the Microstructural and Dielectric Properties of Ba_0.6Sr_0.4TiO₃ Ceramics

Relaxor Behavior and Dielectric Properties of MgTiO₃‐Doped BaZr_0.35Ti_0.65O₃ Composite Ceramics for Tunable Applications

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Synthesis and dielectric properties of a new class of MX6Ti6O19 (M=Ba, Sr and Ca; X=Mg and Zn) ceramics

Cited by 12 publications

References 12 publications

Dielectric Properties and Reliability of Zn0.95Mg0.05TiO3+0.25TiO2 MLCCs with Different Pd/Ag Ratios of Electrodes

Dielectric Properties and Reliability of Zn0.95Mg0.05TiO3+0.25TiO2 MLCCs with Different Pd/Ag Ratios of Electrodes

Effects of CuO Doping on the Microstructural and Dielectric Properties of Ba0.6Sr0.4TiO3 Ceramics

Relaxor Behavior and Dielectric Properties of MgTiO3‐Doped BaZr0.35Ti0.65O3 Composite Ceramics for Tunable Applications

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Dielectric Properties and Reliability of Zn_0.95Mg_0.05TiO₃+0.25TiO₂ MLCCs with Different Pd/Ag Ratios of Electrodes

Dielectric Properties and Reliability of Zn_0.95Mg_0.05TiO₃+0.25TiO₂ MLCCs with Different Pd/Ag Ratios of Electrodes

Effects of CuO Doping on the Microstructural and Dielectric Properties of Ba_0.6Sr_0.4TiO₃ Ceramics

Relaxor Behavior and Dielectric Properties of MgTiO₃‐Doped BaZr_0.35Ti_0.65O₃ Composite Ceramics for Tunable Applications