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Title: | Ferroelectric transitions by Ca substitution in Pb0.7 Nd0.2 TiO3 | Authors: | Wang, J. Sim, C.H. Lao, Z. Soon, H.P. |
Issue Date: | 2008 | Citation: | Wang, J., Sim, C.H., Lao, Z., Soon, H.P. (2008). Ferroelectric transitions by Ca substitution in Pb0.7 Nd0.2 TiO3. Journal of Applied Physics 103 (8) : -. ScholarBank@NUS Repository. | Abstract: | Ferroelectric Pb0.7 (1-y) Ca0.7y Nd0.2 TiO3 (PCNT- y) compositions with y ranging from 0 to 0.60, were synthesized via a mechanical activation route. The tetragonality (c/a) of PCNT- y at room temperature decreases from 1.0125 to 1.0000 upon substitution of Pb2+ with smaller sized Ca2+. The composition with Ca-doping y=0.60 demonstrates a unit-cell volume shrinkage of 4.063% as compared to that of Pb0.7 Nd0.2 TiO3, while the Raman spectra are of the characteristic features of PbTiO3. As the Ca content (y) increases from 0 to 0.60, there is a crossover from a displacive phase transition (y=0 and 0.10) to a diffusive one (0.20y0.40), accompanied by a decrease in transition temperature (TC or Tmax) at a linear rate of ∼8.2 K/at. %. The compositions with y | Source Title: | Journal of Applied Physics | URI: | http://scholarbank.nus.edu.sg/handle/10635/86342 | ISSN: | 00218979 |
Appears in Collections: | Staff Publications |
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