期刊
CERAMICS INTERNATIONAL
卷 45, 期 7, 页码 9390-9396出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.08.147
关键词
Multiferroics; Dielectric properties; Ferroelectric properties; Magnetic properties; Perovskite ceramics; Phase separation
资金
- Joint Project CNR, Italy - Romanian Academy Study and Development of Single-Phase Multiferroic Perovskite Ceramic and Thin Films for Multifunctional Devices
- European Union
- Romanian Government, under POS-CCE project CEUREMAVSU [01/01.03.2009]
- [PN09-450]
We report the structural, dielectric, elastic, ferroelectric and ferromagnetic properties of multiferroic (Nd, Fe)doped PbTiO3 perovskite ceramics with composition (Pb-0.88 Nd-0.08 )(Ti-0.94 Fe-0 .04 Mn-0.02)O-3, prepared by different solid state reaction methods: the first one based on a single-stage calcination (Method I) and the second based on a double-stage calcination (Method II). Structural, dielectric and anelastic measurements evidenced a double phase transition for samples prepared by Method I, which has been attributed to phase separation. This phase separation has been confirmed also by TEM and HRTEM investigations. Samples prepared by Method II showed a single phase transition from paraelectric to ferroelectric phase. We found coexistent ferroelectric and ferromagnetic properties, also at room-temperature, but only for ceramics prepared by Method II. The crucial role of calcination process for avoiding phase separation and obtaining homogeneous structures with ferroelectric and ferromagnetic order is underlined.
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