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Anomalous thermal expansion in PMN-PSN solid solutions
Vakhrushev S. B.
1, Alekseeva O. A.
1, Bronwald Yu. A.
1, Budaev A. S.2, Raevski I. P.
3
1Ioffe Institute, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
3Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
3Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
Email: s.vakhrushev@mail.ioffe.ru, alekseeva.oa@mail.ioffe.ru, yuramel@gmail.com, igorraevsky@gmail.com
The temperature evolution of the volumetric coefficient of thermal expansion (CTE) in single crystals (1-x)PbMg1/3Nb2/3O_3+(x)PbSc1/2Nb1/2O3 (PMN-PSN) at x=0.35 (PMN-PSN35), x=0.8 (PMN-PSN80) and pure PSN has been studied. In PSN and PMNPSN80, an abrupt transition from a smooth decrease in CTE with reaching zero in the cubic phase typical for relaxors to a negative CTE in the rhombohedral phase was observed. Negative CTE exists in the temperature range of about 40 K. In the PMN-PSN35 crystal CTE smoothly passes from positive to negative values. At T~250 K a phase transition (PT) to a low-symmetry (presumably monoclinic) phase was found. Below this temperature the CTE smoothly returns to positive values. Keywords: relaxors, antiferroelectrics, phase transitions, negative thermal expansion, solid solutions.
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