Effect of La3+ on microwave dielectric properties of (Pb1−xCax)(Fe0.5Nb0.5)O3 (x = 0.5–0.6) ceramics
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Qiuhong Yang
Abstract
Microwave dielectric properties of La3+-doped (Pb1−xCax)(Fe0.5Nb0.5)O3 (x = 0.5–0.6) ceramics were investigated, and a superstructure was detected in these ceramics. The dielectric constant (∊r) and the temperature coefficient of the resonant frequency (TCF) decreased, while the Qf value of the specimens increased with the increase in Ca2+ content. At the same Ca2+ content, the ∊r and Qf values of La3+-doped specimens were much higher than those of undoped ones. This is attributed to the elimination of oxygen vacancies by the solid solution of surplus La3+ with (Pb, Ca)2+. Excellent microwave dielectric properties of Qf= 6795 GHz, ∊r = 96.41 with TCF = −4.99 ppm · K−1 were obtained at x = 0.55.
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Articles in the same Issue
- Contents
- Contents
- Editorial
- A new editor for IJMR and other changes
- ECAA 2011
- Proceeding Papers
- A model for co-clusters and their strengthening in Al–Cu–Mg based alloys: a comparison with experimental data
- Effect of room temperature storage time on precipitation in Al–Mg–Si(–Cu) alloys with different Mg/Si ratios
- Influence of Mg/Si ratio on the clustering kinetics in Al–Mg–Si alloys
- Effect of simultaneous deformation and artificial ageing on the mechanical properties of an Al–Mg–Si alloy
- Ab-initio modeling of metastable precipitation processes in aluminum 7xxx alloys
- The kinetics of clustering in Al–Mg–Si alloys studied by Monte Carlo simulation
- Regular Articles
- A physically based approach to model the incomplete bainitic transformation in high-Si steels
- Impact of interannealing on recrystallization during final annealing in twin-belt cast Al–Fe–Si sheet
- Direct preparation of ferrite magnetic material from Jinchuan nickel sulfide concentrate by acid leaching
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- Comment to the paper “Re-evaluation of activities of magnesium and zinc components in the magnesium–zinc binary system from very low to high temperature”
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