Phase composition and microwave dielectric properties of Mg-excess MgTiO3 ceramics

Xue, Xin; Yu, Hongtao; Xu, Guangliang

doi:10.1007/s10854-012-0921-4

Cited by 24 publications

(10 citation statements)

References 21 publications

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“…Remarkable progress has been made in microwave related advanced wireless communication systems such as substrates, resonators, filters, global positioning systems and intelligent transport systems [1][2][3][4]. These dielectric materials for microwave communication require a low dielectric constant (e r ) which increases the signal propagation velocity as well as to reduce the cross-coupling effect, a high quality factor (Q 9 f) which increases selectivity of the frequency, and a near-zero temperature coefficient of resonant frequency (s f B ± 10 ppm/°C) which ensures the stability of the frequency against temperature [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Liu

Hao

et al. 2014

J Mater Sci: Mater Electron

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The effects of TiO 2 addition on the densification, microstructure and microwave dielectric properties of pseudo-wollastonite ceramics (a-CaSiO 3 ) have been investigated. The X-ray diffraction (XRD) patterns results indicate that samples exhibit a two-phase system, which has a wollastonite-structured a-CaSiO 3 primary phase associated with a CaTiSiO 5 minor phase. However, the TiO 2 addition undermines the microwave dielectric properties because of the poor quality factor of the secondary phase of CaTiSiO 5 , which can inhibit the growth of a-CaSiO 3 grains by surrounding their boundaries. The a-CaSiO 3 ceramics containing 2 wt% of TiO 2 sintered at 1,300°C showed excellent microwave dielectric properties: an e r value of 7.86, a quality factor Q 9 f value of 16,491 GHz, and a s f value of 0.76 ppm/°C.

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Section: Introductionmentioning

confidence: 99%

Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Liu

Hao

et al. 2014

J Mater Sci: Mater Electron

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“…It can be inhibited by adjusting the stoichiometric ratio of Mg/Ti to a value of slightly >1. 27 In this work, Mg 2 TiO 4 (ICDD #00-025-1157) was formed because of the excessive MgO.…”

Section: Resultsmentioning

confidence: 85%

Grain size engineered 0.95MgTiO₃–0.05CaTiO₃ ceramics with excellent microwave dielectric properties and prominent mechanical performance

Wang

Guo

et al. 2021

J Am Ceram Soc

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Microwave communication systems are being developed with the goal to achieve miniaturization and high reliability. There are urgent requirements for microwave dielectric materials to exhibit low sintering temperatures, excellent microwave dielectric properties, and prominent mechanical performance. However, simultaneously achieving these requirements is a significant challenge. These concerns have been addressed in the uniform ultrafine-grained 0.95MgTiO 3 -0.05CaTiO 3 ceramics with an average grain size of ~0.6 µm via a grain size engineering strategy. Interestingly, the sintering temperature in the unique two-step sintering method of 1250℃/1 min and 1130℃/10 h is much lower (200-300℃) than that obtained in the conventional sintering method reported previously (1400-1450℃). Excellent dielectric properties are achieved, with relative permittivity ε r = 20.11, quality factor Q × f = 68 613 GHz, and temperature coefficient of resonant frequency τ f = 1.81 ppm/℃. The bending strength f , Vickers hardness H v , and elastic modulus E reach up to 212.4 MPa, 10.1 GPa, and 200.7 GPa, respectively. These values are significantly enhanced over those of samples obtained via the conventional sintering method with an average grain size of ~2.5 µm. For the first time, uniform ultrafine-grained microwave dielectric materials with excellent microwave dielectric properties and prominent mechanical performance were synthesized. This work provides a guideline for developing other high-performance microwave dielectric materials and makes a significant contribution to the miniaturization and high reliability of microwave dielectric devices.

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“…Investigation of ℃ introduction SrTiO 3 into Mg(Zr 0.05 Ti 0.95 )O 3 ceramics suggested that a close zero τ f value could achieve at 0.96Mg(Zr 0.05 Ti 0.95 )O 3 -0.04SrTiO 3 [445,446]. In the study of a designed composition of MgTiO 3 (Mg/Ti = 1, 1.02, 1.04, 1.05, 1.07), the generation of MgTi 2 O 5 which derived from Mg/Ti = 1 was restrained, and then pure phase of MgTiO 3 was obtained when Mg/Ti = 1.02 [447]. (Co 1-x Zn x )TiO 3 sintered at 1350 possessed ℃ ε r ≈ 20, Q×f value ≈ 107,000GHz, and τ f ≈ -60 ppm/ ℃ with x = 0.05 [448].…”

Section: Abo 3 Formulamentioning

confidence: 99%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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Phase composition and microwave dielectric properties of Mg-excess MgTiO3 ceramics

Cited by 24 publications

References 21 publications

Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Grain size engineered 0.95MgTiO₃–0.05CaTiO₃ ceramics with excellent microwave dielectric properties and prominent mechanical performance

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

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Phase composition and microwave dielectric properties of Mg-excess MgTiO3 ceramics

Cited by 24 publications

References 21 publications

Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Microstructure and microwave dielectric properties of TiO2-doped pseudo-wollastonite ceramics

Grain size engineered 0.95MgTiO3–0.05CaTiO3 ceramics with excellent microwave dielectric properties and prominent mechanical performance

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Contact Info

Product

Resources

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Grain size engineered 0.95MgTiO₃–0.05CaTiO₃ ceramics with excellent microwave dielectric properties and prominent mechanical performance