Relationships between crystal structure and microwave dielectric properties of Li2(Mg1−xCox)3TiO6 (0 ≤ x ≤ 0.4) ceramics

Pan, Hailong; Cheng, Ling; Wu, Haitao

doi:10.1016/j.ceramint.2017.08.026

Cited by 73 publications

(17 citation statements)

References 36 publications

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“…Nevertheless, the Raman modes related to the translation of Cu 2+ / Mg 2+ locate around 200-225 cm -1 and 280-300 cm -1 , as previously reported [12]. It should be noted that in the structure of melilite Ba2CuGe2O7, the As well known, the dielectric permittivity and losses at microwave frequency bands not only depend on the intrinsic factors, but also the extrinsic ones from density (or pore), grain size, phase constitution, and phase transition, etc [20,[24][25][26]. Evidenced from the crystal structure and microstructure, magnesium substitution did not cause phase transformation, or induce the second phase, or change the grain morphology and grain size distribution.…”

Section: Effects Of Magnesium Substitution On Crystal Structure and Msupporting

confidence: 69%

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A low-firing melilite ceramic Ba2CuGe2O7 and compositional modulation on microwave dielectric properties through Mg substitution

Yin

Shu

et al. 2020

Preprint

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Abstract A melilite Ba2CuGe2O7 ceramic was characterized with low sintering temperature and moderate microwave dielectric properties. Sintered at 960 oC, the Ba2CuGe2O7 ceramic had a high relative density 97%, a low relative permittivity 9.43, and a quality factor of 20,000 GHz. To get a deep understanding of the relationship between composition, structure, and dielectric performances, magnesium substitution for copper in Ba2CuGe2O7 was conducted. Influences of magnesium doping on the sintering behavior, crystal structure, and microwave dielectric properties were studied. Mg doping in Ba2CuGe2O7 caused negligible changes in the macroscopic crystal structure, grain morphology, and size distribution, while induced visible variation in the local structure as revealed by Raman analysis. Microwave dielectric properties exhibit a remarkable dependence on composition. On increasing the magnesium content, the dielectric constant (εr) featured a continuous decrease, while both the quality factor (Q × f) and the temperature coefficient of resonance frequency (τf) increased monotonously. Such variations in dielectric performances were clarified in terms of the polarizability, packing fraction, and band valence theory.

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Section: Effects Of Magnesium Substitution On Crystal Structure and Msupporting

confidence: 69%

“…Thereby, the composition dependence of τf can be analyzed by studying the respective variation in ε value. Derived from the definition for ε, Bosman and Havinga divided the formula as follows[32]:…”

mentioning

confidence: 99%

A low-firing melilite ceramic Ba2CuGe2O7 and compositional modulation on microwave dielectric properties through Mg substitution

Yin

Shu

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…As well known, the relative permittivity and losses at microwave frequency bands not only depend on the intrinsic factors, but also the extrinsic ones from density (or pore), grain size, phase constitution, and phase transition, etc. [20,[24][25][26]. Evidenced from the crystal structure and microstructure, magnesium substitution did not cause phase transformation, or induce the second phase, or change the grain morphology and grain size www.springer.com/journal/40145 distribution.…”

Section: Effects Of Magnesium Substitution On Crystal Structure Andmentioning

confidence: 98%

“…Thereby, the composition dependence of τ f can be analyzed by studying the respective variation in  ε value. Derived from the definition for  ε , Bosman and Havinga divided the formula as follows [32]:…”

Section: Effects Of Magnesium Substitution On Dielectric Propertiesmentioning

confidence: 99%

A low-firing melilite ceramic Ba2CuGe2O7 and compositional modulation on microwave dielectric properties through Mg substitution

et al. 2020

View full text Add to dashboard Cite

A melilite Ba2CuGe2O7 ceramic was characterized by low sintering temperature and moderate microwave dielectric properties. Sintered at 960 °C, the Ba2CuGe2O7 ceramic had a high relative density 97%, a low relative permittivity (εr) 9.43, a quality factor (Q×f) of 20,000 GHz, and a temperature coefficient of resonance frequency (τf) −76 ppm/°C. To get a deep understanding of the relationship between composition, structure, and dielectric performances, magnesium substitution for copper in Ba2CuGe2O7 was conducted. Influences of magnesium doping on the sintering behavior, crystal structure, and microwave dielectric properties were studied. Mg doping in Ba2CuGe2O7 caused negligible changes in the macroscopic crystal structure, grain morphology, and size distribution, while induced visible variation in the local structure as revealed by Raman analysis. Microwave dielectric properties exhibit a remarkable dependence on composition. On increasing the magnesium content, the relative permittivity featured a continuous decrease, while both the quality factor and the temperature coefficient of resonance frequency increased monotonously. Such variations in dielectric performances were clarified in terms of the polarizability, packing fraction, and band valence theory.

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“…The negative τ f values can be compensated by Ca 0.8 Sr 0.2 TiO 3 , and the sample with 0.91Li 2 Mg 3 TiO 6 -0.09Ca 0.8 Sr 0.2 TiO 3 showed a τ f value of -3.65 ppm/ [278]. ℃ [281], and Li 2 Mg 3 TiO 6 [282] revealed that the bond ionicity (f i ) descended as The phase transitions among the orthorhombic, cubic, and monoclinic were verified by XRD (Fig. 12) and TEM analysis (Fig.…”

Section: Rock-salt Structurementioning

confidence: 94%

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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Relationships between crystal structure and microwave dielectric properties of Li2(Mg1−xCox)3TiO6 (0 ≤ x ≤ 0.4) ceramics

Cited by 73 publications

References 36 publications

A low-firing melilite ceramic Ba2CuGe2O7 and compositional modulation on microwave dielectric properties through Mg substitution

A low-firing melilite ceramic Ba2CuGe2O7 and compositional modulation on microwave dielectric properties through Mg substitution

A low-firing melilite ceramic Ba2CuGe2O7 and compositional modulation on microwave dielectric properties through Mg substitution

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

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