Phase-microstructure evolution and microwave dielectric characteristic of (1− x )(Sr 0.5 Ce 0.5 )TiO 3+δ − x NdAlO 3 solid solution

2017 ◽  
Vol 37 (9) ◽  
pp. 3051-3057 ◽  
Author(s):  
Burhan Ullah ◽  
Wen Lei ◽  
Xiao-Qiang Song ◽  
Xiao-Hong Wang ◽  
Wen-Zhong Lu
Keyword(s):  
Solid Solution ◽  
Microstructure Evolution ◽  
Dielectric Characteristic ◽  
Microwave Dielectric

Microstructure evolution of YSZ/Al2O3 supersaturated solid solution

2021 ◽  
Vol 549 ◽  
pp. 149260
Author(s):  
Yongdong Yu ◽  
Yongting Zheng ◽  
Xudong Liu ◽  
Yuchen Yuan ◽  
Wanjun Yu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Microstructure Evolution ◽  
Supersaturated Solid Solution

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.

Crystal Structure of Dielectric Ceramics in the La(Mg0.5Ti0.5)O3–BaTiO3 System

2002 ◽  
Vol 17 (5) ◽  
pp. 1112-1117 ◽  
Author(s):  
M. Avdeev ◽  
M. P. Seabra ◽  
V. M. Ferreira
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Structural Changes ◽  
Rietveld Method ◽  
Cation Ordering ◽  
Microwave Dielectric Ceramics ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Microwave Dielectric ◽  
Dielectric Ceramics

The crystal structure of microwave dielectric ceramics in the (1 − x)La(Mg0.5Ti0.5)O3 (LMT)–xBaTiO3 (BT) (0 ≤ x ≤ 0.9) system has been refined by Rietveld method using x-ray powder diffraction data. LMT and BT were found to form a solid solution in the whole compositional range. The increase of BaTiO3 content results in the following sequence of structure transformations of those solid solutions: P21/n (a−a−c+, B-site ordered) → Pbnm (a−a−c+) → I4/mcm (a0a0c−) → Pm3m (a0a0a0). These structural changes are related to the disappearance of B-site cation ordering (x > 0.1), in-phase tilting (x > 0.3), and antiphase tilting (x > 0.5), respectively.

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