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Using LiF and PbF 2 (mole ratio 1:1, LPF) as sintering additives, the x CoFe 2 O 4 /(1 − x ) Pb 0.9025 La 0.065 (Zr 0.58 Ti 0.42 ) 0.975 Nb 0.02 O 3 [ x = 0.1, 0.2, 0.3, and 0.4 in weight] (abbreviate as CFO/PLZT) 0–3 magnetoelectric (ME) composite ceramics were developed via a liquid phase sintering technique. A ZrO 2 layer was coated on the CFO particles via a sol–gel method in order to inhibit the diffusion of Fe 3+ and Co 2+ ions from the ferrite CFO phase to the ferroelectric PLZT phase. With using 6 wt% additives of LPF, dense composite ceramics can be obtained in a sintering temperature region of 1000–1150 °C for 30 min. Moreover, overall performance of the ceramics with relatively low CFO content ( x = 0.2) has been optimized. The effects of CFO content and sintering temperature on micromorphology, crystalline structure, piezoelectric, dielectric, and ME properties were investigated. It was found that the 0.2CFO/0.8PLZT composite ceramics exhibited a d 33 of 80 pC/N and a ME coefficient of 102 mV/Oe cm at 215 kHz. |
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