Effect of cobalt-doping on the dielectric properties and densification temperature of Li2MgSiO4 ceramic: Calculation and experiment

2020 ◽  
Vol 827 ◽  
pp. 154162 ◽  
Author(s):  
Rui Peng ◽  
Yuanxun Li ◽  
Hua Su ◽  
Yongcheng Lu ◽  
Yanru Yun ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Cobalt Doping ◽  
Densification Temperature

The effect of cobalt-doping on microstructure and dielectric properties of CaCu3Ti4O12 ceramics

2017 ◽  
Vol 727 ◽  
pp. 168-176 ◽  
Author(s):  
Zahra Kafi ◽  
Ahmad Kompany ◽  
Hadi Arabi ◽  
Ali Khorsand Zak
Keyword(s):  
Dielectric Properties ◽  
Cobalt Doping

Effect of cobalt doping on structural, optical and dielectric properties of TiO2

2016 ◽  
Author(s):  
C. Stella ◽  
Diva Prabhakar ◽  
N. Soundararajan ◽  
K. Ramachandran
Keyword(s):  
Dielectric Properties ◽  
Cobalt Doping

Low-Temperature Sintering and Dielectric Properties of (Zn1-xMgx)TiO3

2007 ◽  
Vol 546-549 ◽  
pp. 2215-2218 ◽  
Author(s):  
Xiang Chun Liu ◽  
Feng Gao ◽  
Ming Zhao ◽  
Chang Sheng Tian
Keyword(s):  
Dielectric Properties ◽  
Stability Region ◽  
Sintering Temperature ◽  
Hexagonal Phase ◽  
Chemical Processing ◽  
Low Temperature Sintering ◽  
Sintering Aids ◽  
Densification Temperature ◽  
Measuring Frequency ◽  
Dielectric Ceramics

The dielectric ceramics comprised of (Zn1-xMgx)TiO3 (x=0.1~0.5, abbreviated to ZMT) were developed by conventional mixed-oxide method combined with a semi-chemical processing. V2O5 was used as sintering aids to lower the sintering temperature of ceramics. The results showed that the hexagonal phase stability region extended from 900 to 1150°C as the amount of magnesium increased. The densification temperature of ZMT ceramics could be reduced from 1200 to 875°C by V2O5 additions and using semi-chemical processing, the relative density of ZMT ceramics with 1.00wt% V2O5 addition reach 95% at 875°C. The dielectric properties of ZMT were measured at different frequencies and the results showed that there existed a decreasing tendency of the loss tangents (tg δ) with increasing measuring frequency. It is concluded that εr=22 and tg δ= 5.7×10-4 can be obtained for ZMT ceramics at sintering temperature 875°C.

Synthesis and Characterization the Dielectric Properties of Cobalt Doping Hexagonal BaTiO3

2013 ◽  
Vol 456 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Shau-Wei Yu ◽  
Wang-Chi Vincent Yeh ◽  
Jya-Ler Jou ◽  
Chien-Ming Lei
Keyword(s):  
Dielectric Properties ◽  
Synthesis And Characterization ◽  
Cobalt Doping

scholarly journals Effects of Cu substitution on microstructures and microwave dielectric properties of Li2ZnSiO4 ceramics

2022 ◽  
Vol 355 ◽  
pp. 01025
Author(s):  
Qin Zhang ◽  
Hua Su ◽  
Xiaoli Tang
Keyword(s):  
Phase Composition ◽  
Dielectric Properties ◽  
Bulk Density ◽  
Microwave Dielectric Properties ◽  
Temperature Stability ◽  
Secondary Phase ◽  
Densification Temperature ◽  
Microwave Dielectric ◽  
Cu Substitution ◽  
Sintering Characteristics

Herein, the influence of Cu2+ substitution on the phase composition, bulk density, microstructures, and microwave dielectric properties of Li2CuxZn1−xSiO4 (0 ≤ x ≤ 0.06) ceramics prepared by a solid-state reaction were investigated. The results of XRD and mapping showed that Cu2+ substitution can avoid the influence of secondary phase on the properties of samples. According to the analysis of bulk density, microstructure and microwave dielectric properties, a proper amount of Cu substitution not only improved the sintering characteristics of Li2CuxZn1−xSiO4 ceramics, reduced the densification temperature from 1250 °C to 950 °C, but also increased the Q×f value. Furthermore, Cu2+ substitution also improved the temperature stability of the samples. Particularly, the Li2Cu0.04Zn0.96SiO4 ceramics sintered at 950 °C for 5 h possessed excellent microwave dielectric properties: εr = 5.624, Q×f = 12,764 GHz, and τf = −77 ppm/°C, exhibiting a potential for the low temperature co-fired ceramic applications.

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

2021 ◽  
Author(s):  
Rui Peng ◽  
Yongcheng Lu ◽  
Qin Zhang ◽  
Yuanming Lai ◽  
Guoliang Yu ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Density Functional ◽  
Dft Calculation ◽  
Simultaneous Thermal Analysis ◽  
Mechanical Analysis ◽  
Cavity Method ◽  
Mechanism Study ◽  
X Ray Diffraction ◽  
Densification Temperature ◽  
Order Degree

AbstractWith 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.

Low-Temperature Sintering and Microwave Dielectric Properties of (Ca0.9Mg0.1)SiO3 Ceramic with Li2CO3 Addition

2014 ◽  
Vol 602-603 ◽  
pp. 748-751 ◽  
Author(s):  
Xin Hui Zhao ◽  
Min Jia Wang ◽  
Qi Long Zhang ◽  
Hui Yang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Low Dielectric Constant ◽  
Low Temperature Sintering ◽  
Low Dielectric ◽  
Densification Temperature ◽  
Microwave Dielectric

(Ca0.9Mg0.1)SiO3ceramics possess a low dielectric constant and a highQfvalue, however, the densification temperature of (Ca0.9Mg0.1)SiO3ceramics is higher than 1280°C. In this paper, the effect of Li2CO3addition on sinterability and dielectric properties of (Ca0.9Mg0.1)SiO3ceramics were studied. The phase presence and surface morphology were determined by XRD and SEM techniques, respectively. CaSiO3and Ca2MgSi2O7phases were observed. With the addition of >2.0 wt% Li2CO3, the sintering temperature of (Ca0.9Mg0.1)SiO3ceramic was significantly lowered, reaching to 1070°C. (Ca0.9Mg0.1)SiO3ceramics with 4wt% Li2CO3sintered at 1070°C for 3 h shows excellent dielectric properties:εr=5.91,Qf= 15300GHz (at 10GHz).

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