Effect of Co2+ Substitution on the Microwave Dielectric Properties of LiZnPO4 Ceramics

Peng, Rui; Li, Yuanxun; Yu, Guoliang; Lu, Yongcheng; Li, Sheng

doi:10.1007/s11664-018-6665-z

Cited by 29 publications

(11 citation statements)

References 25 publications

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“…As shown in Figure 1E, the composite ceramics synthesized in this experiment provided both excellent dielectric and sintering properties when compared with other ceramics. 7,8,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] Figure 2A-D presents the XRD patterns of all the samples processed at the same temperature (950°C). A single ZBO phase (JCPDS#37-1486) was formed for the samples with x = 0.00 and 0.05 and increasing the Mg 2+ content resulted Since the densification temperature of ZBO is 925°C, the increasing density for the sample with x = 0.05 sintered at 900°C should be attributed to the decreasing densification temperature due to lattice distortion, and the decreasing density value for the same sample sintered at 925-975°C can be ascribed to the over-sintering.…”

Section: Methodsmentioning

confidence: 99%

Three‐phase borate solid solution with low sintering temperature, high‐quality factor, and low dielectric constant

Peng

et al. 2021

J. Am. Ceram. Soc.

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The sintering and microwave dielectric properties of a ceramic material based on the mixing of Mg 3 B 2 O 6 and Zn 3 B 2 O 6 have been widely studied using first-principles calculations and experimental solid-state reactions. Characterization methods include the Network Analyzer, X-ray, Raman diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and differential-thermal and thermo-mechanical analyzer. The increasing amount of Mg 2+ results in the appearance of Mg 2 B 2 O 5 and ZnO, and the mutual substitution (Mg 2+ and Zn 2+ ) phenomenon has emerged in Zn 3 B 2 O 6 and Mg 2 B 2 O 5 . The mechanisms have been explained with the help of DFT calculations. The bond parameters and electron distributions of the ZnO 4 tetrahedron and MgO 6 octahedron have been modified due to substitution. The sintering, substitution, and phase formation properties have been analyzed quantitatively through the energy parameters. The best dielectric properties were obtained for x = 0.20 sintered at 950°C, ε r = 6.47, Q × f = 89 600 GHz (15.2 GHz), τ f = −48.6 ppm/°C, relative density = 96.7%. The mixing of Zn 3 B 2 O 6 and Mg 3 B 2 O 6 ceramics is a feasible method to obtain a ceramic with low sintering temperature and excellent dielectric properties.

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Section: Methodsmentioning

confidence: 99%

Three‐phase borate solid solution with low sintering temperature, high‐quality factor, and low dielectric constant

Peng

et al. 2021

J. Am. Ceram. Soc.

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“…The decreased cell volume also influenced the increased ε r to some extent because the theoretical dielectric constant was dominated by the crystal volume and total polarizability of atoms [30]. Figure 5(e) presents the comparison of sintering and dielectric properties of different ceramics, and the materials obtained in this study have excellent dielectric performance [5,[7][8][9][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. Therefore, a moderate nickel substitution could improve the dielectric properties of the MBO ceramic and lower its intrinsic densification temperature.…”

Section: Resultsmentioning

confidence: 96%

“…However, its sintering temperature is excessively high to meet the requirement of LTCC. The substitution of equivalence ions with different (ones with close) ionic radius and polarizability (e.g., Mg 2+ with Co 2+ , Cu 2+ , and Ni 2+ ) is an effective method to lower the intrinsic densification temperature, but the influence mechanism has not been discussed in detail [3,[8][9][10][11][12][13]. Therefore, we speculate that the moderate substitution of Mg 2+ with Ni 2+ could lower the densification temperature of MBO, and the first-principles calculation was considered to explore the amelioration mechanism [14][15][16][17][18][19][20].…”

Section: Introduction mentioning

confidence: 99%

Amelioration of sintering and multi-frequency dielectric properties of Mg3B2O6: A mechanism study of nickel substitution using DFT calculation

Peng

Zhang

et al. 2021

J Adv Ceram

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With the support of density functional theory (DFT) calculation, the amelioration of sintering and dielectric properties of the Mg3B2O6 (MBO) ceramic was realized through the substitution of magnesium with nickel. The TE-mode cylindrical cavity method was used to measure the dielectric properties at different frequencies. The thermo-mechanical analysis and simultaneous thermal analysis were used to characterize the chemical and mechanical properties. The phase composition was determined through the X-ray diffraction (XRD) and Raman spectrum. The microstructure was investigated using the scanning electron microscopy (SEM). Magnesium substitution with nickel (4 mol%) could ionize the B-O bond of BO3, modify the vibration mode, improve the order degree, densify the microstructure, decrease the intrinsic densification temperature, and ameliorate the dielectric properties of the MBO ceramics. The maximum values were achieved for the ceramics with 4 mol% nickel and sintered at 1175 °C, that is, 97.2% for relative density, 72,600 GHz (10 GHz), 75,600 GHz (11.4 GHz), and 92,200 GHz (15 GHz) for Q × f, 7.1 (10 GHz), 7.01 (11.4 GHz), and 6.91 (15 GHz) for εr, and −56.3 ppm/°C for τf.

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“…The bulk density was obtained through Archimedes method, and relative density was calculated by Eq. (1), where W 1 and W 2 denote the weight fraction of two materials; ρ 1 and ρ 2 are the corresponding theoretical density [29]. The electrical resistivities were examined using the DC four-probe (RST-9) method within the range of 25-125 °C.…”

Section: Methodsmentioning

confidence: 99%

High-performance electrical properties of La-based perovskite ceramics for the functional phase of thick film resistors

Chen

et al. 2021

Journal of Alloys and Compounds

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In order to explore an economical functional phase alternative material for thick lm resistors, the crystal structure, microstructure, and electrical properties of (1-x)LSCN + xLCNZ (x = 0.0-1.0) composite ceramics were studied through solid-state reaction experiments. The composite ceramics were characterized by xray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy, and DC four-probe method. Results suggested that the main phases of LSCN and LCNZ were formed, along with a small part of impurity phases. The addition of LCNZ to LSCN decreased the electrical conductivity and changed the TCR from positive to negative. Zero TCR could be achieved around 0.6 < x < 0.8 and relatively low absolute TCR values could be obtained for the samples of 0.4 ≤ x ≤ 0.8. The ceramic of 0.6LSCN + 0.4LCNZ showed the optimal performances of conductivity = 1923 S/cm, TCR = 379.54 ppm/℃, and relative density = 95.05%.

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Effect of Co2+ Substitution on the Microwave Dielectric Properties of LiZnPO4 Ceramics

Cited by 29 publications

References 25 publications

Three‐phase borate solid solution with low sintering temperature, high‐quality factor, and low dielectric constant

Three‐phase borate solid solution with low sintering temperature, high‐quality factor, and low dielectric constant

Amelioration of sintering and multi-frequency dielectric properties of Mg3B2O6: A mechanism study of nickel substitution using DFT calculation

High-performance electrical properties of La-based perovskite ceramics for the functional phase of thick film resistors

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