Influence of CaTiO3 modification on microstructures and microwave dielectric properties of Mg0.97Zn0.03TiO3 ceramics doped with 0.5mol% Zn-excess

Li, Lingxia; Ye, Jing; Zhang, Shuai; Gao, Zhengdong; Li, Sai

doi:10.1016/j.jallcom.2015.06.210

Cited by 9 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the diffraction peaks of CST phase at 47.0–47.5 ° have no obvious shift, meaning that although the ion radius of Ce 3+ (1.34 Å, CN = 12) is closer to those of Ca 2+ (1.00 Å, CN = 12) and Sr 2+ (1.44 Å, CN = 12), the small amount of Ce 3+ doping do not significantly alter the large lattice size of CST. Moreover, a weak diffraction peak of MgTi 2 O 5 phase (JCPDS 35–0792) at 25.0–26.0 ° is observed in the MCe x T−CST ceramics, and its intensity improves slightly with further Ce 3+ addition, which is generally formed when Mg/Ti ratio is less than 1 in the MT system and would decrease the dielectric properties, as reported in other MT‐system studies 35,36 . The lattice parameters for MT in function of the Ce‐level were calculated from XRD patterns and are shown in Figure 4.…”

Section: Resultssupporting

confidence: 54%

“…15,34 The obtained mixed phases in the MCe • is observed in the MCe x T−CST ceramics, and its intensity improves slightly with further Ce 3+ addition, which is generally formed when Mg/Ti ratio is less than 1 in the MT system and would decrease the dielectric properties, as reported in other MT-system studies. 35,36 The lattice parameters for MT in function of the Ce-level were calculated from XRD patterns and are shown in dense microstructure with a low porosity can be observed in each SEM image. The ceramic grains are distributed non-uniformly, and the average grain sizes of Ce 3+ doping samples (1.22-1.33 μm) are slightly smaller than that of pure MT−CST (1.36 μm), which suggest the Ce 3+ addition inhibits the grain growth of MCeT−CST.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Ce³⁺doping on phase and microwave dielectric properties of 0.94MgTiO₃−0.06(Ca_0.8Sr_0.2)TiO₃ceramics

Shi

Zhang

Sun

et al. 2022

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

In this study, 0.94Mg (1-3x/2) Ce x TiO 3 −0.06(Ca 0.8 Sr 0.2 )TiO 3 (MCe x T−CST, 0≤x≤0.01) composite ceramics were prepared at a low temperature of 1175 • C by using the 50-nm-sized powders. The effects of Ce 3+ doping on crystalline phase, microstructure, and microwave dielectric properties of MCe x T−CST were studied. A main ilmenite (Mg,Ce)TiO 3 phase and a minor perovskite (Ca 0.8 Sr 0.2 )TiO 3 phase coexist well with the appearance of impurity MgTi 2 O 5 phase in MCe x T−CST. The dielectric properties of MCe x T−CST are affected by the molecular polarizability, the impurity phase, and the Ce 3+ doping. The replacement of Mg 2+ by high valence Ce 3+ could effectively inhibit the formation of oxygen vacancy, resulting in the enhancement of Q×f. When x = 0.005, MCe x T−CST exhibits microwave dielectric properties with a moderate ε r of 21.5, a high Q×f of 67 000 GHz, and a near-zero τ f of −0.74 ppm/ • C. The results reveal that the Ce 3+ substitution is a prospective approach to optimize the microwave dielectric properties of MgTiO 3 -based ceramics. K E Y W O R D S0.94Mg (1-3x/2) Ce x TiO 3 −0.06(Ca 0.8 Sr 0.2 )TiO 3 , Ce 3+ doping, low-temperature sintering, microwave dielectric properties 1 3392

show abstract

Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Effect of Ce³⁺doping on phase and microwave dielectric properties of 0.94MgTiO₃−0.06(Ca_0.8Sr_0.2)TiO₃ceramics

Shi

Zhang

Sun

et al. 2022

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Since the normal component of E is not continuous over a region separating the two media of different permittivities the inclusion of an air gap between the dielectric resonator and the feed probe is taken into account in the DRA structure. 25,26 The factors that have an impact on the overall performance of the antenna include the permittivity of the DRA, dimensions of the DRA, the microstrip feed length, the air gap, and the dimension of the ground plane. The ground plane's dimensions are calibrated to maximize the antenna's bandwidth.…”

Section: Resultsmentioning

confidence: 99%

Exploration of MgTiO₃-CaTiO₃ Ceramic-Based Dielectric Resonator Antenna for Sub-6 GHz 5G Communication Application

Mohapatra

Barman

Das

et al. 2023

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

There has been extensive research on microwave dielectric materials considering their applications in 5G communication technologies. In this work, the microwave dielectric performances of 0.95MgTiO3-0.05CaTiO3 (MCT) ceramic for sub-6 GHz frequency 5G application have been reported.The solid-state reaction technique was used to develop the MCT ceramic. The structural as well as dielectric properties of MCT were systematicallyexamined.X-ray diffraction was used to examine the crystalline phase of the MCT sample. The microwave dielectric properties, including relative permittivity, temperature coefficient of resonant frequency, and quality factorof MCT were measured. Using MCT ceramic as the resonator, a dielectric resonator antenna has been simulated using HFSS software, which realizes that the S11 curve is in good accordance and that efficiency is high at 5.22 GHz. The extraordinary performances indicate that MCT ceramic is a potential candidate for 5G application.

show abstract

“…Doping of Fe 2 O 3 during the synthesis of MgTiO 3 could inhibit the synthesis of intermediate phase magnesium dititanate (MgTi 2 O 5 ) [18][19][20]. Furthermore CaTiO 3 can be synthesised by doping with CaO that improves the denseness of MgTiO 3 grains [21,22]. It can therefore be deduced that MgTiO 3 can be synthesised by using recycled MH bricks.…”

Section: Introductionmentioning

confidence: 99%

Influence of B₂O₃ doping on synthesis of MgTiO₃ ceramics from recycled magnesia-hercynite materials

Jia

Mao

Lin

et al. 2021

Mater. Res. Express

View full text Add to dashboard Cite

Herein, magnesium metatitanate (MgTiO3) ceramics were synthesised using recycled magnesia-hercynite (MH) bricks as the raw materials to achieve solid waste reusing of cement kiln refractories. The recycled MH materials were mixed with anatase TiO2 to investigate the effect of addition of doped B2O3 during the synthesis of MgTiO3 ceramics at 1400 °C. Phase compositions and microstructural studies were performed using x-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. In addition, energy-dispersive spectroscopy (EDS) was conducted and the dielectric properties of the samples were studied. Results show that the addition of B2O3 can promote sintering, improve shrinkage, promote densification, stabilise MgTiO3 lattice, and inhibit the formation of MgTiO3. In addition, the presence of appropriate amount of B2O3 can accelerate the material diffusion and result in grain growth through the formation of intercrystalline liquid phase. Results also suggest that an increase in dielectric constant results in a decrease in dielectric loss. It was concluded that 2 wt% was the optimum amount of B2O3 required to obtain the most favourable synthesis rate of MgTiO3 (98.2%). The samples exhibited a maximum density of 3.69 g·cm−3 and excellent microwave dielectric properties at ε r = 18.28 and tanδ = 0.086.

show abstract

Influence of CaTiO3 modification on microstructures and microwave dielectric properties of Mg0.97Zn0.03TiO3 ceramics doped with 0.5mol% Zn-excess

Cited by 9 publications

References 31 publications

Effect of Ce³⁺doping on phase and microwave dielectric properties of 0.94MgTiO₃−0.06(Ca_0.8Sr_0.2)TiO₃ceramics

Effect of Ce³⁺doping on phase and microwave dielectric properties of 0.94MgTiO₃−0.06(Ca_0.8Sr_0.2)TiO₃ceramics

Exploration of MgTiO₃-CaTiO₃ Ceramic-Based Dielectric Resonator Antenna for Sub-6 GHz 5G Communication Application

Influence of B₂O₃ doping on synthesis of MgTiO₃ ceramics from recycled magnesia-hercynite materials

Contact Info

Product

Resources

About

Influence of CaTiO3 modification on microstructures and microwave dielectric properties of Mg0.97Zn0.03TiO3 ceramics doped with 0.5mol% Zn-excess

Cited by 9 publications

References 31 publications

Effect of Ce3+doping on phase and microwave dielectric properties of 0.94MgTiO3−0.06(Ca0.8Sr0.2)TiO3ceramics

Effect of Ce3+doping on phase and microwave dielectric properties of 0.94MgTiO3−0.06(Ca0.8Sr0.2)TiO3ceramics

Exploration of MgTiO3-CaTiO3 Ceramic-Based Dielectric Resonator Antenna for Sub-6 GHz 5G Communication Application

Influence of B2O3 doping on synthesis of MgTiO3 ceramics from recycled magnesia-hercynite materials

Contact Info

Product

Resources

About

Effect of Ce³⁺doping on phase and microwave dielectric properties of 0.94MgTiO₃−0.06(Ca_0.8Sr_0.2)TiO₃ceramics

Effect of Ce³⁺doping on phase and microwave dielectric properties of 0.94MgTiO₃−0.06(Ca_0.8Sr_0.2)TiO₃ceramics

Exploration of MgTiO₃-CaTiO₃ Ceramic-Based Dielectric Resonator Antenna for Sub-6 GHz 5G Communication Application

Influence of B₂O₃ doping on synthesis of MgTiO₃ ceramics from recycled magnesia-hercynite materials