Ceramics-based capacitors with excellent energy storage characteristics,fast charging/discharge rate,and high efficiency have received significant attention.In this work,Na0.73Bi0.09NbO3(NBN)ceramics were processed th...Ceramics-based capacitors with excellent energy storage characteristics,fast charging/discharge rate,and high efficiency have received significant attention.In this work,Na0.73Bi0.09NbO3(NBN)ceramics were processed through solid-state sintering route.The investigated ceramics were crystallized in a single perovskite phase.Dense microstructure,with small average grain size(~0.92 mm)is obtained for the investigated ceramics.A high dielectric constant>1000 accompanied by a low dielectric loss was achieved for these ceramics at ambient temperature.A recoverable energy density~0.92 J/cm3 and ultra-high efficiency of 96.33%at 138 kV/cm were obtained at room temperature.Furthermore,a lower discharging time of 0.14 ms was also achieved.This material is a suitable candidate for power pulsed applications.展开更多
All the compositions in the(1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3(0 ≤ x ≤ 0.2) series were fabricated using solid state sintering route. Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3 posses...All the compositions in the(1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3(0 ≤ x ≤ 0.2) series were fabricated using solid state sintering route. Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3 possessed excellent microwave dielectric properties with ε_r ≈ 17.1, Q_uf_0 ≈ 195855 GHz, and τ_f ≈-46 ppm/℃. t f was tuned through zero by mixing with Ca_(0.6)La_(0.8/3)TiO_3. In the present study, τ_f ≈-2 ppm/℃ with er ≈ 23.9 and high Q_uf_0 ≈ 115870 GHz was achieved for x = 0.15, i.e., for a mixture of 85% Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3.展开更多
基金The Higher Education Commission(HEC)Islamabad Pakistan has financially supported this work through the National Research Program for University(7488/KPK/NRPU/R&D/HEC/2017)The financial support extended by HEC,Pakistan through Project No.NRPU-8148。
文摘Ceramics-based capacitors with excellent energy storage characteristics,fast charging/discharge rate,and high efficiency have received significant attention.In this work,Na0.73Bi0.09NbO3(NBN)ceramics were processed through solid-state sintering route.The investigated ceramics were crystallized in a single perovskite phase.Dense microstructure,with small average grain size(~0.92 mm)is obtained for the investigated ceramics.A high dielectric constant>1000 accompanied by a low dielectric loss was achieved for these ceramics at ambient temperature.A recoverable energy density~0.92 J/cm3 and ultra-high efficiency of 96.33%at 138 kV/cm were obtained at room temperature.Furthermore,a lower discharging time of 0.14 ms was also achieved.This material is a suitable candidate for power pulsed applications.
基金Directorate of Science and Technology (DOST) under itsdevelopmental scheme "Promotion and Support of R&D in Public & Private Sector, Phase 1 in Khyber Pakhtunhwa (R&D)" Funded Project 2011–2012 Peshawar, Pakistan
文摘All the compositions in the(1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3(0 ≤ x ≤ 0.2) series were fabricated using solid state sintering route. Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3 possessed excellent microwave dielectric properties with ε_r ≈ 17.1, Q_uf_0 ≈ 195855 GHz, and τ_f ≈-46 ppm/℃. t f was tuned through zero by mixing with Ca_(0.6)La_(0.8/3)TiO_3. In the present study, τ_f ≈-2 ppm/℃ with er ≈ 23.9 and high Q_uf_0 ≈ 115870 GHz was achieved for x = 0.15, i.e., for a mixture of 85% Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3.
