Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

Manan, Abdul; Ullah, Zahid; Ahmad, Arbab Safeer; Ullah, Atta; Khan, Dil Faraz; Hussain, Arshad; Khan, M. Gabriel

doi:10.1007/s40145-018-0258-4

Cited by 27 publications

(9 citation statements)

References 30 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: 68%

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: 68%

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%

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

Yin

Shu

et al. 2020

J Adv Ceram

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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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“…5. The apparent densities of the major sample was an approximate value of 3.80 g/cm 3 and relative density also has reached more than 95%. It is noticeable that the good degree of densification was in accord with the SEM results.…”

Section: Resultsmentioning

confidence: 91%

“…Microwave dielectric ceramics have sprung up in the communication industry and received widely attention. It is required to have a high quality factor (Q×f), a moderate dielectric constant (εr) and a near-zero temperature coefficient of resonant frequency (τf) to meet the demands of application [1][2][3][4]. Recently, researchers focused on novel microwave dielectric ceramics [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effects of (Mg1/3Sb2/3)4+ Substitution on the Structure and Microwave Dielectric Properties of Ce2Zr3x(Mg1/3Sb2/3)3-3x(MoO4)9 Ceramics

Zhang

Sun

Zhang

et al. 2020

Preprint

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Ce2[Zr1-x(Mg1/3Sb2/3)x]3(MoO4)9 (0.02≤x≤0.10) ceramics were prepared well through the traditional solid-state method. A single phase, belonging to the space group of R-3c, was detected by using X-ray diffraction at sintering temperatures ranging from 700 to 850 °C. The crystallization micro-structural of specimens was examined by applying Scanning electron microscopy. The structural refinement of these samples was investigated in detail by performing the Rietveld refinement method. The intrinsic properties were calculated and explored via far-infrared reflectivity spectroscopy. The correlations between the chemical bonds parameters and microwave dielectric properties were calculated and analyzed by P-V-L theory. Ce2[Zr0.94(Mg1/3Sb2/3)0.06]3(MoO4)9 ceramics with excellent dielectric properties: εr = 10.37, Q×f = 71748 GHz and τf = −13.6 ppm/°C sintered at 725 °C for 6 hours.

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Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

Cited by 27 publications

References 30 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

Effects of (Mg1/3Sb2/3)4+ Substitution on the Structure and Microwave Dielectric Properties of Ce2Zr3x(Mg1/3Sb2/3)3-3x(MoO4)9 Ceramics

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