Crystal structure and microwave dielectric properties of NaPb2B2V3O12(B=Mg, Zn) ceramics

Rakhi, M.; Subodh, G.

doi:10.1016/j.jeurceramsoc.2018.07.023

Cited by 43 publications

(19 citation statements)

References 40 publications

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“…The modes below 250 cm –1 are mainly related to the external translational motion of Ag + /Pb + and

({Mg}^{2 +} / {Zn}^{2 +}) -

O bonds. The internal bending vibrations of [VO 4 ] 3− lie between 300 and 600 cm −1 , whereas the modes above 600 cm −1 correspond to the symmetric and asymmetric stretching of the [VO 4 ] 3− group, which linearly depends on the lattice parameter …”

Section: Resultsmentioning

confidence: 99%

“…All the other cations are occupied in their fixed positions . The position of oxygen in a garnet structure can be deduced using the following equations:

\begin{matrix} x = 0.0278 r (A) + 0.0123 r (B) - 0.0482 r (C) + 0.0141 \\ y = - 0.0237 r (A) + 0.0200 r (B) + 0.0321 r (C) + 0.0523 \\ z = - 0.0102 r (A) + 0.0305 r (B) - 0.0217 r (C) + 0.6519 \end{matrix}

Here x , y , and z represent the 96 h site atomic position of an O atom. A , B , and C are the ionic radii of the ions (expressed in Å).…”

Section: Resultsmentioning

confidence: 99%

“…At the optimum sintering temperature of 750°C, APMVO shows the maximum bulk density of 5.59 g/cm 3 with the percentage density of 96.3 ± 0.1, while APZVO possesses bulk density of 5.99 g/cm 3 with 94.6 ± 0.1 percentage density at its optimum temperature of 590°C. Usually, ceramics containing Zn 2+ ions are sintered at lower temperatures compared to those containing Mg 2+ ions …”

Section: Resultsmentioning

confidence: 99%

“…Usually, ceramics containing Zn 2+ ions are sintered at lower temperatures compared to those containing Mg 2+ ions. 31,35,36 (4) The microstructures of APMVO and APZVO sintered at the optimum sintering temperatures of 750°C and 590°C, respectively, are shown in Figure 4. Both compounds show a dense and homogeneous microstructure with less porosity, which confirms its high density at the optimum sintering temperature.…”

Section: Crystal Structurementioning

confidence: 99%

“…Also recently Cheng et al reported two garnet compounds AgCa 2 B 2 V 3 O 12 (B = Mg, Zn) with ε r = 10.3 and 11.2, Q u × f = 43 000 and 26 930 GHz and

τ_{normalf} = - 69 and - 95 ppm {false/}^{\circ} C

respectively. More recently, we reported two ceramic compounds, NaPb 2 B 2 V 3 O 12 (B = Mg, Zn) with

ε_{normalr} = 20.6

and 22.4, unloaded quality factor (

Q_{normalu} \times f

) = 22 800 ( f = 7.7 GHz) and 7900 ( f = 7.4 GHz) and temperature coefficient of the resonant frequency = +25.1 and −6 ppm/°C respectively . In 2006, Iishi et al reported a series of novel garnets including Pb 2 AgB 2 V 3 O 12 (B = Mg, Zn), but their microwave dielectric properties have not been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

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Crystal structure, phonon modes, and bond characteristics of AgPb₂B₂V₃O₁₂ (B = Mg, Zn) microwave ceramics

Madhuri

Subodh

2020

J Am Ceram Soc

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AgPb2B2V3O12 (B = Mg, Zn) ceramics with low sintering temperature were synthesized via the conventional solid‐state reaction route. Rietveld refinements of the X‐ray diffraction patterns confirm cubic symmetry with space group Ia3¯d. The number of observed vibrational modes and those predicted by group theoretical calculations also confirm the Ia3¯d space group. At the optimum sintering temperature of 750°C/4 hours, AgPb2Mg2V3O12 has a relative permittivity of 23.3 ± 0.2, unloaded quality factor (Qnormalu×f) of 26 900 ± 500 GHz (f=7.57GHz), and temperature coefficient of resonant frequency of 19.3 ± 1 ppm/°C, while AgPb2Zn2V3O12 has the corresponding values of 26.4 ± 0.2, 28 400 ± 500 GHz (f=7.21GHz) and –18.4 ± 1 ppm/°C at 590°C/4 hours. Microwave dielectric properties of a few reported garnets and Pb2AgB2V3O12 (B = Mg, Zn) ceramics were correlated with their intrinsic characteristics such as the Raman shifts as well as width of A1g Raman bands. Higher quality factor was obtained for lower full width at half‐maxima (FWHMs) values of A1g modes. The increase in B‐site bond valence contributes to high Qnormalu×f and low |τf| with the substitution of Zn2+ by Mg2+. Furthermore, the high ionic polarizability and unit cell volume with Zn2+substitution contribute to increased relative permittivity.

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“…The modes below 250 cm –1 are mainly related to the external translational motion of Ag + /Pb + and

({Mg}^{2 +} / {Zn}^{2 +}) -

Section: Resultsmentioning

confidence: 99%

“…All the other cations are occupied in their fixed positions . The position of oxygen in a garnet structure can be deduced using the following equations:

\begin{matrix} x = 0.0278 r (A) + 0.0123 r (B) - 0.0482 r (C) + 0.0141 \\ y = - 0.0237 r (A) + 0.0200 r (B) + 0.0321 r (C) + 0.0523 \\ z = - 0.0102 r (A) + 0.0305 r (B) - 0.0217 r (C) + 0.6519 \end{matrix}

Here x , y , and z represent the 96 h site atomic position of an O atom. A , B , and C are the ionic radii of the ions (expressed in Å).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Crystal Structurementioning

confidence: 99%

“…Also recently Cheng et al reported two garnet compounds AgCa 2 B 2 V 3 O 12 (B = Mg, Zn) with ε r = 10.3 and 11.2, Q u × f = 43 000 and 26 930 GHz and

τ_{normalf} = - 69 and - 95 ppm {false/}^{\circ} C

respectively. More recently, we reported two ceramic compounds, NaPb 2 B 2 V 3 O 12 (B = Mg, Zn) with

ε_{normalr} = 20.6

and 22.4, unloaded quality factor (

Q_{normalu} \times f

Section: Introductionmentioning

confidence: 99%

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Crystal structure, phonon modes, and bond characteristics of AgPb₂B₂V₃O₁₂ (B = Mg, Zn) microwave ceramics

Madhuri

Subodh

2020

J Am Ceram Soc

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Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO₃‐0.09(Ca_0.8Na_0.1Ce_0.1)TiO₃ Composite Ceramics

Tao

et al. 2021

Eur J Inorg Chem

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Recently, the progress of miniaturization and integration for dielectric communication devices is being motivated by the rapidly‐developed communication technology. Microwave dielectric ceramics, the foundation of dielectric communication devices, have been receiving great attention. In this study, 0.91MgTiO3‐0.09(Ca0.8Na0.1Ce0.1)TiO3 ceramic (0.91MT‐0.09CNCT) was synthesized by the traditional solid‐phase process to tune the temperature coefficient of resonant frequency (τf) to zero. Compared with 0.95MgTiO3–0.05CaTiO3 ceramic, a Q×f value increased by 15 % was achieved in 0.91MT‐0.09CNCT ceramic, meanwhile, the sintering temperature of which was significantly lowered by 225 °C. In general, the τf value is related to the (Ca0.8Na0.1Ce0.1)TiO3 content and sintering temperature. At the same time, the 0.91MT‐0.09CNCT ceramic sintered at 1175 °C has competitive dielectric properties: ϵr=20.4, Q×f=66,000 GHz, τf=0.2 ppm/°C, which suggests it a promising candidate for dielectric communication devices with low cost and green synthesis.

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Synthesis and dielectric performance of new calcium boro-stannate microwave ceramics

Yang,

Li,

Chen

2024

J Mater Sci

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Crystal structure and microwave dielectric properties of NaPb2B2V3O12(B=Mg, Zn) ceramics

Cited by 43 publications

References 40 publications

Crystal structure, phonon modes, and bond characteristics of AgPb₂B₂V₃O₁₂ (B = Mg, Zn) microwave ceramics

Crystal structure, phonon modes, and bond characteristics of AgPb₂B₂V₃O₁₂ (B = Mg, Zn) microwave ceramics

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO₃‐0.09(Ca_0.8Na_0.1Ce_0.1)TiO₃ Composite Ceramics

Synthesis and dielectric performance of new calcium boro-stannate microwave ceramics

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Crystal structure and microwave dielectric properties of NaPb2B2V3O12(B=Mg, Zn) ceramics

Cited by 43 publications

References 40 publications

Crystal structure, phonon modes, and bond characteristics of AgPb2B2V3O12 (B = Mg, Zn) microwave ceramics

Crystal structure, phonon modes, and bond characteristics of AgPb2B2V3O12 (B = Mg, Zn) microwave ceramics

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO3‐0.09(Ca0.8Na0.1Ce0.1)TiO3 Composite Ceramics

Synthesis and dielectric performance of new calcium boro-stannate microwave ceramics

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Crystal structure, phonon modes, and bond characteristics of AgPb₂B₂V₃O₁₂ (B = Mg, Zn) microwave ceramics

Crystal structure, phonon modes, and bond characteristics of AgPb₂B₂V₃O₁₂ (B = Mg, Zn) microwave ceramics

Microwave Dielectric Properties and Sintering Behavior of K20 Series Temperature‐Stable 0.91MgTiO₃‐0.09(Ca_0.8Na_0.1Ce_0.1)TiO₃ Composite Ceramics