Coexistence of monoclinic and tetragonal phases in PMN-PT single crystal
E.B. Araujo, C.A. Guarany, K. Yukimitu, J.C.S. Moraes, A.C., Hernandes
TL;DR
This study uses infrared spectroscopy to investigate phase transitions in PMN-PT single crystals near the morphotropic phase boundary, revealing coexistence of monoclinic and tetragonal phases between 198 and 300 K.
Contribution
It reports the first observation of monoclinic and tetragonal phase coexistence in PMN-PT near MPB using infrared spectroscopy.
Findings
Coexistence of monoclinic and tetragonal phases observed between 198 and 300 K.
Infrared spectroscopy detects phase singularities not seen by other techniques.
Phase coexistence occurs near the MPB in PMN-PT single crystals.
Abstract
The purpose of the present work is to report studies on structural phase transition for PMN-xPT single crystal, with melt PbTiO3 composition around the MPB (x = 0.35 mol %), using infrared spectroscopy technique. The study was centered on monitoring the behavior of the stretching-(Nb-O), stretching-(Ti-O) and stretching-(Mg-O) stretching modes as a function of temperature. Singularities observed between 198 and 300 K suggested a possible coexistence between the monoclinic and tetragonal phases, not revealed by others techniques, for PMN-PT composition studied near MPB.
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Taxonomy
TopicsFerroelectric and Piezoelectric Materials · Advanced ceramic materials synthesis · Inorganic Chemistry and Materials