Optimized sintering temperature and enhanced microwave dielectric performance of Mg2B2O5 ceramic

Fan, Guangchao; Zhou, Huanfu; Chen, Xiuli

doi:10.1007/s10854-016-5595-x

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Unit cell parameters which belongs to space group-P-1 were also determined from rietveld refinement; a = 6.1648, b = 9.2355, c = 3.1314, α = 90.51, β = 92.17, γ = 104.48. Whereas the parameters obtained by Fan et al[24] for the similar system synthesized with different technique at 1100ºC were; a = 6.1563, b = 9.2228, c = 3.1217, α = 90.46, β = 92.16, γ = 104.39. The minor difference between these parameters may be due to variation of synthesis conditions which affects crystal structure of material.…”

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confidence: 94%

Structural, diffuse reflectance and luminescence study of t-Mg2B2O5 nanostructures

Kumar

Singh

et al. 2021

Appl. Phys. A

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We report here the structural, reflectance, photoluminescence and thermoluminescence study of t-Mg 2 B 2 O 5 nanostructures synthesized using optimized combustion method relatively at much lower temperature. The rietveld refinement of X-ray diffraction data confirms single-phase triclinic crystal structure of Mg 2 B 2 O 5 nanoparticles. The direct band gap determined using diffuse reflectance spectra (DRS) was 5.23 eV, which is contrary to earlier reports quoting Mg 2 B 2 O 5 as indirect band gap material. To elucidate the nature of band gap in Mg 2 B 2 O 5 , we performed first principle calculations based on full potential linearized augmented plane-wave (FPLAPW) method, predicting the direct band gap of 5.10 eV in t-Mg 2 B 2 O 5 which is in good agreement with our experimental results. The t-Mg 2 B 2 O 5 nanoparticles were found to exhibit yellow-reddish photoluminescence peaking at 588 nm, attributed to various defects states. The combustion synthesized Mg 2 B 2 O 5 nanocrystals exhibited ultraviolet (254 nm) responsive thermoluminescence (TL). TL glow curve of Mg 2 B 2 O 5 comprises of one dominant peak around 417-428 K and less intense shoulder around 573-589 K which arouse possibility of various trapping sites or defects present in the sample. The TL analysis using general order Kitti's equations was performed to estimate the activation energies of trapping states. Owing to already well-known mechanical and thermal properties, the direct wide band gap nature and UV responsive thermoluminescence of combustion synthesized t-Mg 2 B 2 O 5 nanostructures can pave way for its use in luminescence-based applications and UV dosimetry. As an additional application of Mg 2 B 2 O 5 , anti-biofilms activity of Mg 2 B 2 O 5 nanoparticles using pseudomonas aeruginosa bacterial cells was also performed which revealed 91 ± 2.7% inhibition of biofilms formed by P. aeruginosa, respectively, at 100 μg/ml after 24 h of treatment.

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confidence: 94%

Structural, diffuse reflectance and luminescence study of t-Mg2B2O5 nanostructures

Kumar

Singh

et al. 2021

Appl. Phys. A

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“…Peng et al [15] reported Li 2 (Mg 1−x Ni x )SiO 4 ceramics with the addition of 2 wt% lithium-boron-bismuth-silicon (LBBS) glass and realised excellent dielectric properties at 900 ℃ (sintering) and microwave dielectric properties. Fan et al [16] [18]. Sintering additives [19][20][21][22][23][24][25][26][27][28][29], ultrafine powders [30][31][32][33][34], and low-sintering-temperature materials [35][36][37] can be used to reduce the sintering temperature of ceramics.…”

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confidence: 99%

Sintering behaviour and microwave dielectric properties of MgO-2B2O3-xwt%BaCu(B2O5)-ywt%H3BO3 ceramics

Wang

et al. 2021

J Adv Ceram

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This study investigates the bulk density, sintering behaviour, and microwave dielectric properties of the MgO-2B2O3 series ceramics synthesised by solid-state reaction. According to the X-ray diffraction and microstructural analyses, the as-prepared MgO-2B2O3 ceramics possess a single-phase structure with a rod-like morphology. The effects of different quantities of H3BO3 and BaCu(B2O5) (BCB) on the bulk density, sintering behaviour, and microwave dielectric properties of the MgO-2B2O3 ceramics were investigated. Accordingly, the optimal sintering temperature was obtained by adding 30 wt% H3BO3 and 8 wt% BCB. We also reduced the sintering temperature to 825 °C. Furthermore, the addition of 40 wt% H3BO3 and 4 wt% BCB increased the quality factor, permittivity, and temperature coefficient of resonance frequency of MgO-2B2O3 to 44,306 GHz (at 15 GHz), 5.1, and −32 ppm/°C, respectively. These properties make MgO-2B2O3 a viable low-temperature co-fired ceramic with broad applications in microwave dielectrics.

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“…Nishizuka et al [12] demonstrated that the MgO-xB2O3 (x = 25 and 33) sintered at low temperatures exhibited remarkable dielectric properties with a εr of ~7 and Q×f of 79,100-260,100 GHz (@ x = 33) and 39,600-310,000 GHz (@ x = 25). Zhou et al [13] reported optimal microwave dielectric properties could be obtained at sintering temperature as low as 1,100°C with a molecular ratio of MgO:B2O3 = 1:1. The resulted ceramics showed excellent microwave dielectric properties with a εr of 5.83, Q×f of 41,930 GHz and τf of ~62 ppm/ o C. According to Zhou's work, MgO-2B2O3-4wt%BaCu(B2O5) ceramics possess good microwave dielectric properties, showing promising potential applications in LTCCs [14].…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior and Microwave Dielectric Properties of MgO-2B 2 O 3 - Xwt %H 3 BO 3 - Ywt %BCB Ceramics

WANG

et al. 2021

Preprint

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The bulk density, sintering behavior and microwave dielectric properties of MgO-2B2O3 series ceramics synthesized by solid-state reaction method were systematically studied in this paper. X-ray diffraction and microstructural analysis revealed that the as-prepared MgO-2B2O3 ceramics possessed a single-phase structure with rod-like morphology. Through the investigation of the effects of different dosages of H3BO3 and BCB on bulk density, sintering behavior and microwave dielectric properties of MgO-2B2O3 ceramics, the optimum sintering temperature was obtained at an addition of 30wt%H3BO3 and 8wt%BCB and the sintering temperature was reduced to 825 oC. The addition of 40wt %H3BO3 and 4 wt%BCB increased the quality factor Q×f, permittivity εr and temperature coefficient of resonance frequency τf of MgO-2B2O3 to 44,306 GHz, 5.1 and -32 ppm/oC, respectively, meeting the criteria of low-temperature co-fired ceramics.

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Optimized sintering temperature and enhanced microwave dielectric performance of Mg2B2O5 ceramic

Cited by 5 publications

References 19 publications

Structural, diffuse reflectance and luminescence study of t-Mg2B2O5 nanostructures

Structural, diffuse reflectance and luminescence study of t-Mg2B2O5 nanostructures

Sintering behaviour and microwave dielectric properties of MgO-2B2O3-xwt%BaCu(B2O5)-ywt%H3BO3 ceramics

Sintering Behavior and Microwave Dielectric Properties of MgO-2B 2 O 3 - Xwt %H 3 BO 3 - Ywt %BCB Ceramics

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