Abstract
The phase diagram of the Pb(Lu0.5Nb0.5)O3-PbTiO3 (PLN-PT) binary system was previously reported based on XRD and dielectric measurements results. Unusually, the Curie temperature of PLN-PT with low PT obtained from the phase diagram is much lower than that of PLN and PT end members, which is different from others, such as PZT. Therefore, the complex structure of PLN-PT with low PT is desired to be studied. In this work, PLN-PT single crystals with low PT were grown for the study of their super-lattice structure and phase evolution. The super-lattice reflections were identified by X-ray diffraction. Domains and their evolution by heating from room temperature to 150 °C were observed under a polarized light microscope. The phase transition from the ferroelectric phase to the paraelectric phase was determined by dielectric spectra and polarized light microscopy. A precursor/intermediate phase exhibiting pinched hysteresis loops was displayed above the Curie temperature, which originates from some polar region embedded in the non-polar matrix. The coexistence of the ferroelectric and antiferroelectric domains leads to peculiarities of the phase transitions, such as a lower Curie temperature compared with PLN and PT. The studies of the phase evolution of PLN-PT with low PT single crystal is a supplementary amendment of the PLN-PT phase diagram as previously reported.
Highlights
An antiferroelectric (AFE) state is defined as one in which lines of ions are spontaneously polarized but with neighboring lines polarized in antiparallel directions [1]
The coexistence of the ferroelectric and antiferroelectric domains leads to peculiarities of the phase transitions, such as a lower Curie temperature compared with Pb(Lu0.5 Nb0.5 )O3 (PLN) and PT
System have been observed, such as that the Curie temperature of PLN-PT with low PT obtained from the phase diagram is much lower than that of PLN and PT end members
Summary
An antiferroelectric (AFE) state is defined as one in which lines of ions are spontaneously polarized but with neighboring lines polarized in antiparallel directions [1]. Antiferroelectricity is revealed by the antiparallel displacements of Pb2+ ions and the B-site atom ordering in lead-based perovskite materials [2], and has wide applications in energy storage capacitors, mobile electronic devices, and explosive electrical transducers [3,4,5]. AFEs, Pb(Lu0.5 Nb0.5 )O3 (PLN) ceramics were first reported by Kupriyanov and Isupov in the early. The structure and AFE properties of PLN single crystals were studied in our laboratory [2]. Two sets of superlattice reflections, including the B-site atom ordering type reflection and the lead-ion antiparallel ordering type reflection, coexist in PLN single crystals. The Curie temperature TC of PLN was about 240 ◦ C and 254 ◦ C for [111]-oriented and [001]-oriented crystal plates, respectively
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