Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Li, Lingxia; Ding, Xiang; Liao, Qingwei

doi:10.1016/j.jallcom.2011.04.062

Cited by 33 publications

(10 citation statements)

References 23 publications

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“…The secondary peak is completely disappearing at 600°C and a phase pure white MZrT nanopowder was obtained. In earlier reports the single phase of MgTiO 3 was obtained around 1000°C but in this study, single phase of MgTiO 3 is obtained at 600°C itself. This could be due to the uniform, very small particle size and high reactivity of the powders obtained from polyol method.…”

Section: Resultsmentioning

confidence: 49%

“…This limits the usage of this material in practical applications. However, various studies were reported including different synthesis methods and doping of different additives for the improvement of the dielectric response of MgTiO 3 and to suppress the subordinate phases . Furthermore, many studies have been carried out to reduce the sintering temperature of MgTiO 3 ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…However, various studies were reported including different synthesis methods and doping of different additives for the improvement of the dielectric response of MgTiO 3 and to suppress the subordinate phases. [7][8][9][10] Furthermore, many studies have been carried out to reduce the sintering temperature of MgTiO 3 ceramics. Zhou 11 and Sreedhar 12 synthesized MgTiO 3 using solid-state reaction method and observed intermediate phase of MgTi 2 O 5 during the sintering process.…”

Section: Introductionmentioning

confidence: 99%

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Low temperature synthesis and characterization of nano‐crystalline Mg(Zr_0.05Ti_0.95)O₃ ceramics

2018

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Mg(Zr0.05Ti0.95)O3 (MZrT) ceramics nanoparticles have been synthesized by polyol method for the first time. The phase evaluation of the MZrT nanoparticles was confirmed using thermo gravimetric analysis and the phase purity of the samples were analyzed using X‐ray diffraction and Raman spectroscopy. The transmission electron microscopy (TEM) images revealed the average particle size between 30 and 40 nm. The optical bandgap is in the range of 3.66‐3.82 eV and is attributed to the quantum confinement effect. Interestingly, the nanopowders sintered at 950°C for 3 hours exhibit the maximum density of 97.52% of the theoretical density which is attributed to the higher sintering velocity of the smaller particles. The obtained microstructure of the ceramics reveals porous free uniform microstructure with prominent grain boundaries. A best combination of microwave dielectric properties (εr ~18.04, Q × fo ~175 THz at 9.5 GHz) are obtained for MZrT ceramics sintered at 950°C for 3 hours. The non‐Debye‐like relaxation process is found to exist inside the sample confirmed by impedance spectroscopy. The AC conduction mechanism is explained on the basis of Correlated Barrier Hopping model. Thermal conductivity of the MZrT ceramics is found to be 10 W/mK. The obtained properties of MZrT ceramics are suitable for resonator, microwave integrated circuit and LTCC applications.

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Section: Resultsmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low temperature synthesis and characterization of nano‐crystalline Mg(Zr_0.05Ti_0.95)O₃ ceramics

2018

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“…The ceramics samples were sintered at 900°C. The pure LiYW 2 O 8 ceramic were prepared by the reaction-sintering process [7]. Starting material Li 2 CO 3 , WO 3 , Y 2 O 3 were mixed follow the stoichiometric ratio, and milling for 6h.…”

Section: Methodsmentioning

confidence: 99%

Dielectric polarization and electrical properties of Modified PbTiO₃Piezoelectric Ceramics for high frequency transducer applications

Xing

Yan

Liao

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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IntroductionNowadays, high frequency transducers have been widely used in underwater sound equipment of high frequency and high resolution such as three-dimensional imaging sonar, multi-beam sounding sonar, ocean current profiler, side-scan sonar and anti-frogman sonar, etc. They are core functional devices in fields like small target detection and precise imaging. The performance parameter of piezoelectric materials that satisfy applications of high frequency transducers should be provided with low dielectric constant and low dielectric loss. As a critical factor to the performance of transducers, the dielectric loss of piezoelectric materials can not only determine the energy consumption of transducers, but also influence all kinds of other performances of transducers (such as mechanical quality factor Q value and waveform characteristics of transducers, emission/reception efficiency of sonar systems, stability and heat effect of transducers, etc.). Impedance mismatch is one of the main factors of giving rising to system energy consumption and cutting emission/reception efficiency. In electric circuits, the equivalent impedance of devices Z=d/2πfεs (d and s represents thickness and superficial area of devices respectively, and f represents working frequency, ε dielectric constant). For certain impedance, only relatively low dielectric constants can better meet impedance matching at high frequency of utilization.With regard to piezoelectric materials, the domain which gives it piezoelectric properties will bring about extra relaxation polarization, and thus dielectric constant and dielectric loss will be increased. Therefore, the dielectric constant of most piezoelectric materials is all above 1000, and dielectric loss

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“…7 Also, MTO thin films were used as buffer layer for high purity LiNbO 3 grown epitaxially on the c-axis oriented Al 2 O 3 substrates for the applications of integrated optical devices. 8 Surendran et al reported that Zn 2+ and Ni 2+ substitution into Mg 2+ sites in MTO thin films significantly increases the dielectric permittivity and reduces the losses.…”

Section: Introductionmentioning

confidence: 99%

Structural and dielectric studies of Co doped MgTiO3 thin films fabricated by RF magnetron sputtering

et al. 2014

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We report the structural, dielectric and leakage current properties of Co doped MgTiO3 thin films deposited on platinized silicon (Pt/TiO2/SiO2/Si) substrates by RF magnetron sputtering. The role of oxygen mixing percentage (OMP) on the growth, morphology, electrical and dielectric properties of the thin films has been investigated. A preferred orientation of grains along (110) direction has been observed with increasing the OMP. Such evolution of the textured growth is explained on the basis of the orientation factor analysis followed the Lotgering model. (Mg1-xCox)TiO3 (x = 0.05) thin films exhibits a maximum relative dielectric permittivity of ɛr = 12.20 and low loss (tan δ ∼ 1.2 × 10−3) over a wide range of frequencies for 75% OMP. The role of electric field frequency (f) and OMP on the ac-conductivity of (Mg0.95Co0.05)TiO3 have been studied. A progressive increase in the activation energy (Ea) and relative permittivity ɛr values have been noticed up to 75% of OMP, beyond which the properties starts deteriorate. The I-V characteristics reveals that the leakage current density decreases from 9.93 × 10−9 to 1.14 × 10−9 A/cm2 for OMP 0% to 75%, respectively for an electric field strength of 250 kV/cm. Our experimental results reveal up to that OMP ≥ 50% the leakage current mechanism is driven by the ohmic conduction, below which it is dominated by the schottky emission.

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Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Cited by 33 publications

References 23 publications

Low temperature synthesis and characterization of nano‐crystalline Mg(Zr_0.05Ti_0.95)O₃ ceramics

Low temperature synthesis and characterization of nano‐crystalline Mg(Zr_0.05Ti_0.95)O₃ ceramics

Dielectric polarization and electrical properties of Modified PbTiO₃Piezoelectric Ceramics for high frequency transducer applications

Structural and dielectric studies of Co doped MgTiO3 thin films fabricated by RF magnetron sputtering

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Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Cited by 33 publications

References 23 publications

Low temperature synthesis and characterization of nano‐crystalline Mg(Zr0.05Ti0.95)O3 ceramics

Low temperature synthesis and characterization of nano‐crystalline Mg(Zr0.05Ti0.95)O3 ceramics

Dielectric polarization and electrical properties of Modified PbTiO3Piezoelectric Ceramics for high frequency transducer applications

Structural and dielectric studies of Co doped MgTiO3 thin films fabricated by RF magnetron sputtering

Contact Info

Product

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About

Low temperature synthesis and characterization of nano‐crystalline Mg(Zr_0.05Ti_0.95)O₃ ceramics

Low temperature synthesis and characterization of nano‐crystalline Mg(Zr_0.05Ti_0.95)O₃ ceramics

Dielectric polarization and electrical properties of Modified PbTiO₃Piezoelectric Ceramics for high frequency transducer applications