A polyethylene glycol-assisted route to synthesize Pb(Ni1/3Nb2/3)O3-PbTiO3 in pure perovskite phase |
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| Authors: | Yin Ye Shuhui Yu Haitao Huang Limin Zhou |
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| Affiliation: | aDepartment of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;bDepartment of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong |
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| Abstract: | Ferroelectric relaxors (1 − x)Pb(Ni1/3Nb2/3)O3−xPbTiO3 (PNN-PT) with a composition (x = 0.36) near the morphotropic phase boundary (MPB) were prepared by a polyethylene glycol (PEG)-assisted solid-state reaction route. PEG with a molecular weight of 200 was introduced during the ball milling process of the raw oxide powders. XRD and TG/DSC results demonstrated that the interaction between PbO and PEG favors the transformation of lead-rich pyrochlore to lead-deficient pyrochlore, thus facilitating the formation of perovskite phase. Consequently, pure perovskite powders were synthesized at a relatively low temperature of 850 °C. Ceramics fabricated with the PEG-assisted route show a room temperature dielectric constant of 4987 and a maximum dielectric constant (at Tmax) of 24,307 at a frequency of 1 kHz. The piezoelectric constant d33 measured was 460 pC/N. |
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| Keywords: | Ceramics Ferroelectrics Solid-state reactions Thermal analysis |
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