Structural and electrical properties of lanthanum-substituted lead titanate ceramics |
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| Authors: | Sarabjit Singh O P Thakur K K Raina |
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| Institution: | 1. Electroceramics Group , Solid State Physics Laboratory , Lucknow Road, Delhi – 110054, India;2. Materials Research Laboratory , School of Physics &3. Materials Science, Thapar Institute of Engineering &4. Technology , Patiala – 147004, India |
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| Abstract: | The effect of lanthanum substitution on the structural, dielectric and piezoelectric properties of lead calcium titanate (PCT) ceramics is studied. Samples with compositional formula Pb0.76? x La x Ca0.24Ti0.98Mn0.02O3 (PLCT) (x?=?0–0.08, in steps of 0.02) were prepared by the conventional dry ceramic technique. Phase and structural analysis was carried out using XRD and SEM respectively. X-ray analysis confirmed the formation of single-phase compound with tetragonal crystal structure. Dielectric properties were studied in detail as a function of frequency and temperature. The Curie temperature (T C) and tetragonality (c/a) was found to decrease with increase in lanthanum content. The Curie temperature was also confirmed from the thermal-expansion behaviour of the sintered samples. Piezoelectric coefficients (d 33, d 31, g 33, g 31, g h, d h, k t and k p) were measured at room temperature. From this study it is found that La3+ substitution helps in the improvement of electro-mechanical anisotropy. |
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| Keywords: | PCT XRD Thermal expansion Sintering Dielectrics Ferroelectrics Piezoelectrics |
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