期刊
APPLIED PHYSICS LETTERS
卷 96, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3309697
关键词
ageing; barium compounds; defect states; differential scanning calorimetry; ferroelectric materials; ferroelectric transitions; latent heat; manganese; permittivity; zirconium compounds
资金
- National Natural Science Foundation of China [50720145101, 50702042]
- National Basic Research Program of China [2004CB619303, 2010CB631003]
- 111 project of China
It is well known that first-order ferroelectric to paraelectric transition is a one-step transition and it gives rise to one latent heat peak and one permittivity peak during heating. In the present paper, however, we report an unexpected finding; in Mn-doped Ba(Zr0.01Ti0.98Mn0.01)O3-delta the ferroelectric to paraelectric transition proceeds in two steps, after the sample has experienced a prior aging at the differential scanning calorimetry (DSC) peak temperature and followed by cooling down to a fully ferroelectric state. The two-step transition is evidenced by a split DSC peak as well as a split permittivity peak. These abnormal effects can be explained by considering that aging at DSC peak temperature corresponds to aging in a two-phase state (paraelectric+ferroelectric). Such two-phase aging produces two different defect symmetries, which give rise to different stabilities for the same ferroelectric phase and thus results in different reverse transition temperatures.
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