A Novel Magnetodielectric Solid Solution Ceramic 0.4LiFe5 O8 -0.6Li2 MgTi3 O8 with Excellent Microwave Dielectric Properties

2013 ◽  
Vol 96 (10) ◽  
pp. 3027-3030 ◽  
Author(s):  
Li He ◽  
Di Zhou ◽  
Feng Xiang ◽  
Panpan Chang ◽  
Yong Li ◽  
...  
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric

Structures and microwave dielectric properties of Ba6−3x(Nd,Biy)8+2xTi18O54 (x = 2/3) solid solution

2001 ◽  
Vol 16 (6) ◽  
pp. 1734-1738 ◽  
Author(s):  
Yong Jun Wu ◽  
Xiang Ming Chen
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Resonant Frequency ◽  
Temperature Coefficient ◽  
Solid Solubility ◽  
Microwave Dielectric Properties ◽  
Solubility Limit ◽  
Solid Solubility Limit ◽  
Continuous Increase ◽  
Microwave Dielectric

The effects of Bi substitution for Nd in Ba6−3xNd8+2xTi18O54 (x = 2/3) solid solution upon the microstructures and microwave dielectric properties were investigated. The solid solubility limit of Bi in Ba6−3xNd8+2xTi18O54 (x = 2/3) solid solution was about 15 mol%, the same as that for x = 0.5, and densification of the present solid solutions could be performed well at lower temperatures. However, the variation tendency of microwave dielectric properties with composition in the present ceramics quite differed from that for x = 0.5: (1) The temperature coefficient of resonant frequency in the present ceramics showed a continuous variation from positive to negative and did not indicate extreme value at the solid solubility limit. (2) Near-zero temperature coefficient of resonant frequency combined with high-ε and high-Qf values could be obtained in the present ceramics, while that for x = 0.5 had a lower limit of +15 ppm/°C. (3) The dielectric constant also showed a continuous increase for the present compositions, while that in x = 0.5 had an extreme at solid solubility limit. Ceramics with composition of Ba6−3x(Nd0.85,Bi0.15)8+2xTi18O54 (x = 2/3) showed excellent dielectric properties of ε = 99.1, Qf = 5290 GHz, and τf = −5.5 ppm/°C.

Solubility limits and microwave dielectric properties of Ba6−3xSm8+2xTi18O54 solid solution

2011 ◽  
Vol 37 (8) ◽  
pp. 3575-3581 ◽  
Author(s):  
Li Zhong ◽  
Xiao Li Zhu ◽  
Xiang Ming Chen ◽  
Xiao Qiang Liu ◽  
Lei Li
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric

Structures, Dielectric Properties and Luminescence Properties of Nb Doped Li2TiO3 Solid Solution Ceramics

2017 ◽  
Vol 748 ◽  
pp. 137-142 ◽  
Author(s):  
Fei Wang ◽  
Chun Feng Yao ◽  
Qun Zeng ◽  
He Zhou ◽  
Zhi Yong Zhou
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Solution Method ◽  
Microwave Dielectric Properties ◽  
Luminescence Properties ◽  
Monoclinic Structure ◽  
Small Temperature ◽  
Temperature Coefficients ◽  
Microwave Dielectric

In this article, the low-firing Li2+xNb3xTi1-4xO3(x = 0.01, 0.02, 0.04, 0.06) ceramics with monoclinic structure have been obtained by the traditional solid solution method and their microwave dielectric properties were investigated in detail. The ceramics were finely densified at lower temperatures around 1100 °C and demonstrated favorable dielectric performances including relatively low permittivities (εr) ranging from 19 to 24, high Q×f values up to 60,000 GHz (fres = 7.89GHz) and small temperature coefficients of the resonate frequency (for x = 0.02, τf = 10.4 ppm/ °C; x = 0.06, τf = -11.5 ppm/ °C). Furthermore, the ceramics could be densified at around 900°C with adding low-amount of B2O3. Especially, the 1wt.% B2O3-doped Li2+xNb3xTi1-4xO3 (x = 0.06) ceramics was sintered well-densified at 900°C and presented good microwave dielectric properties with εr ∼ 22.2, Q×f ∼ 44,000 GHz. In addition, these ceramics have luminescence properties, which indicated that the ceramics would be applied in LTCC and/or luminescence applications as new luminescence LTCC (low temperature co-fired ceramics) materials.

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