Effects of Sr2+ substitution on the crystal structure, Raman spectra, bond valence and microwave dielectric properties of Ba3-xSrx(VO4)2 solid solutions

Cheng, Kai; Li, Chunchun; Yin, Congling; Tang, Ying; Sun, Yihua; Fang, Liang

doi:10.1016/j.jeurceramsoc.2019.05.030

Cited by 60 publications

(23 citation statements)

References 23 publications

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“…The bond valence, through which the bond strength could be evaluated, V i of atom i was the sum of all valences v ij from i, calculated via Eqs. (16) and (17) [38]. [39,40].…”

Section: Resultsmentioning

confidence: 99%

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Huang

et al. 2020

J Adv Ceram

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In this study, low-temperature fired CaMg 1-x Li 2x Si 2 O 6 microwave dielectric ceramics were prepared via the traditional solid-state reaction method. In this process, 0.4 wt% Li 2 CO 3-B 2 O 3-SiO 2-CaCO 3-Al 2 O 3 (LBSCA) glass was added as a sintering aid. The results showed that ceramics consisted of CaMgSi 2 O 6 as the main phase. The second phases were CaSiO 3 always existing and Li 2 SiO 3 occurring at substitution content x > 0.05. Li + substitution effectively lowered sintering temperature due to 0.4 wt% LBSCA and contributed to grain densification, and the most homogeneous morphology could be observed at x = 0.05. The effects of relative density, the second phase, and ionic polarizability on dielectric constant ( r) were investigated. The quality factor (Q × f) varied with packing fraction that concerned the second phase. Moreover, the temperature coefficient of the resonant frequency (τ f) was influenced by MgO 6 octahedral distortion and bond valence. Excellent dielectric properties of the CaMg 1-x Li 2x Si 2 O 6 ceramic was exhibited at x = 0.05 with  r = 7.44, Q × f = 41,017 GHz (f = 15.1638 GHz), and τ f = −59.3 ppm/℃ when sintered at 900 ℃. It had a good application prospect in the field of low-temperature co-fired ceramic (LTCC) substrate and devices.

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“…The bond valence, through which the bond strength could be evaluated, V i of atom i was the sum of all valences v ij from i, calculated via Eqs. (16) and (17) [38]. [39,40].…”

Section: Resultsmentioning

confidence: 99%

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Huang

et al. 2020

J Adv Ceram

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“…Mg 3 (VO 4 ) 2 sintered at 950°C possesses ε r = 9.3, Q × f = 65 540 GHz and τ f = −89.5 ppm/°C, and Ba 3 (VO 4 ) 2 exhibited good dielectric performance with ε r ~ 11.3, Q × f ~ 62 347 GHz and τ f ~ 28.8 ppm/°C when sintered at 1400°C . In our previous work, Ba 3‐ x Sr x (VO 4 ) 2 solid solution series were reported to have promising microwave dielectric properties with ε r = 11‐16, Q × f = 40 000‐66 000 GHz, and τ f = 20‐70 ppm/°C . Particularly, Sr 3 (VO 4 ) 2 has the lowest densification temperature (~1150°C) along with a combination of promising dielectric performances with a high quality factor of 44 340 GHz and a low dielectric permittivity of 12.2.…”

Section: Introductionmentioning

confidence: 98%

“…20 In our previous work, Ba 3-x Sr x (VO 4 ) 2 solid solution series were reported to have promising microwave dielectric properties with ε r = 11-16, Q × f = 40 000-66 000 GHz, and τ f = 20-70 ppm/°C. 21 Particularly, Sr 3 (VO 4 ) 2 has the lowest densification temperature (~1150°C) along with a combination of promising dielectric performances with a high quality factor of 44 340 GHz and a low dielectric permittivity of 12.2. The high sintering temperature (>1000°C) and relatively large positive τ f value (~ +63.5 ppm/°C), however, still limit its potential utilization in low temperature cofired ceramics (LTCC) application in which the ceramic layers should be cofired with the inner electrodes (generally silver).…”

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confidence: 99%

Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation

Yin

Deng

et al. 2019

J Am Ceram Soc

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Adjustment on resonance frequency stability against the sintering temperature of Sr3V2O8 was realized by adjusting the Sr:V mole ratio. Effects of Sr:V ratio on sintering behavior and dielectric properties of Sr3V2O8 were studied. The sintering temperature was sucessfully reduced to 950°C from 1150°C. With increasing vanadium content, both relative permittivity and quality factor decreased, while the temperature coefficient of resonance frequency shifted from positive to negative values. Especially, a near‐zero τf of −1.1 ppm/°C along with a low permittivity (εr) of 9.8 and a quality factor Q × f of 24 120 GHz was successfully achieved in Sr3‐yV2O8‐y ceramic (y = 0.6, sintered at 950°C). The wide compositional and processing adjustment window, favorable dielectric performances, and good chemical compatibility with silver render Sr3‐yV2O8‐y ceramics potential candidates in multilayer electronic devices.

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“…One method is to form a composite between two compounds with opposite signs of τ f value, for example TiO 2 ( τ f = +450 ppm/°C) and CaTiO 3 ( τ f = +800 ppm/°C) were usually added to the materials with negative τ f value . The other method is to form a solid solution …”

Section: Introductionmentioning

confidence: 99%

“…4 The other method is to form a solid solution. 8 In the past several decades, orthorhombic olivine structure ceramics with a general formula A 2 BO 4 and some other low ε r compounds have been reported with excellent microwave dielectric properties as listed in Table 1. [9][10][11][12][13][14][15][16][17][18][19][20] The low ε r dielectric ceramics usually contain cations with relative low ionic polarizability, such as Al 3+ (0.79 Å 3 ), Ge 4+ (1.63 Å 3 ), Li + (1.20 Å 3 ), Sn 4+ (1.63 Å 3 ), and Si 4+ (0.87 Å 3 ), which form the [AO 6 ] octahedron and [BO 4 ] tetrahedron in the crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg₂Ge_0.98O₄ ceramic

et al. 2019

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An ultra‐low dielectric loss ceramics Mg2Ge0.98O4 with olivine structure was fabricated by conventional solid‐state route. The phase composition, crystal structure, and microwave dielectric properties were investigated. The phase of Mg2Ge0.98O4 is formed to the orthorhombic forsterite structure with a space group Pmnb (62). The dense microstructure and excellent microwave dielectric properties of Mg2Ge0.98O4 ceramic were obtained at 1360°C for 4 hours, with relative density ~96.4%, εr ~ 7.3, Q × f = 112 400 GHz, and τf ~ −64.6 ppm/°C. The conductive mechanism of Mg2Ge0.98O4 in the low frequency (<1 MHz) was studied by the dielectric spectroscopy and the result with Edc = 0.93 eV demonstrates that the defect was contributed to the double ionized oxygen vacancies. The intrinsic dielectric properties of Mg2Ge0.98O4 in the microwave region were obtained by infrared reflectivity spectra with εr ~ 7.13, Q × f = 120 400 GHz. And, acceptable τf (~+2.6 ppm/°C) of 0.92Mg2Ge0.98O4–0.08CaTiO3 composite ceramic was obtained by adding the CaTiO3.

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Effects of Sr2+ substitution on the crystal structure, Raman spectra, bond valence and microwave dielectric properties of Ba3-xSrx(VO4)2 solid solutions

Cited by 60 publications

References 23 publications

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg₂Ge_0.98O₄ ceramic

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Effects of Sr2+ substitution on the crystal structure, Raman spectra, bond valence and microwave dielectric properties of Ba3-xSrx(VO4)2 solid solutions

Cited by 60 publications

References 23 publications

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Tunable microwave dielectric properties in SrO‐V2O5 system through compositional modulation

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg2Ge0.98O4 ceramic

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Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg₂Ge_0.98O₄ ceramic