Wirunchit, Supamas
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Preferred name
Wirunchit, Supamas
Alternative Name
Wirunchit, S.
Main Affiliation
Email
supamas.wi@kmitl.ac.th
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Item type:Publication, Preparation of lead zirconate-lead nickel niobate ceramics by the reaction sintering process(2009-12-01); ; ; Laoratanakul, PitakThe perovskite structure of lead zirconate - lead nickel niobate ceramics, (1-x) PbZrO3-xPb(Ni1/3Nb2/3)O3 (PZ - PNN) at x between 0.00-0.50, has been prepared by the reaction-sintering process. The specimens were prepared directly from a mixture of their constituent oxide without any calcination step. The PZ - PNN ceramics could be obtained after 6 h sintering at 1,100-1,250°C. Crystal structure and phase transition of PZ-PNN were investigated by x-ray diffraction (XRD). XRD indicated that the structure of PZ-PNN ceramics is orthorhombic for a composition where x = 0.00, rhombohedral for compositions where x = 0.10 ≤ x ≤ 0.40 and pseudo-cubic for a composition where x = 0.50. The dielectric properties of the ceramics were measured as functions of both temperature and frequency. The results indicated that the transition temperature decreases with increasing PNN concentration. Furthermore, morphology and grain size evolution have been determined via a scanning electron microscope (SEM). Copyright © Taylor & Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Crossover from antiferroelectric to normal ferroelectric behavior in lead zirconate - lead nickel niobate ceramics prepared by the reaction sintering process(2009-12-01); The lead zirconate - lead nickel niobate ceramics, (1-x)PbZrO3 - xPb(Ni1/3Nb2/3)O3 (PZ-PNN) with x = 0.00-0.10, have been prepared by reaction sintering. Without any calcination involved, the mixture of raw materials was pressed and sintered directly. The PZ-PNN ceramics could be obtained after 6 h sintering at 1,100-1,250°C. The crystal structure data obtained from XRD indicate that the PZ-PNN, where x = 0.00-0.10, successively transforms from orthorhombic to rhombohedral symmetry with an increase in the PNN concentration around x = 0.08. The antiferroelectric phase (AFE) → ferroelectric phase (FE) transition occurs in compositions of 0.0 ≤ x ≤ 0.08. The AFE → FE phase transition shifts to lower temperatures with higher compositions of x. The FE phase temperature range width increases with increased PNN. Copyright © Taylor & Francis Group, LLC.