کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1461682 | 989621 | 2013 | 5 صفحه PDF | دانلود رایگان |
(1−x−y)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3–yBiFeO3 (BNKFT-x/y with 0.12≤x≤0.24, 0≤y≤0.07) lead-free piezoelectric ceramics have been prepared by the combustion technique. The effects of amounts of x and y on structures and electrical properties were examined. Powders and ceramics can be well calcined and sintered at 750 °C for 2 h and 1025–1050 °C, respectively. The results indicated that the crystalline structure and microstructure changed with the increase of x and y concentrations. XRD results of BNKFT-x/0.03 and BNKFT-0.18/y ceramics with 0.12≤x≤0.24 and 0≤y≤0.07 showed the rhombohedral–tetragonal morphotropic phase boundary (MPB). The addition of y caused a promoted grain growth while the addition of x suppressed the grain growth. The highest density (ρ=5.85 g/cm3), superior dielectric properties at Tc (εr=7846 and tan δ=0.02), remnant polarization measured at 40 kV/cm (Pr = 20.1 μC/cm2) and piezoelectric coefficient (d33=213 pC/N) were obtained for x=0.18 and y=0.03.
Journal: Ceramics International - Volume 39, Supplement 1, May 2013, Pages S409–S413