Room-temperature ferromagnetism and ferroelectricity in nanocrystalline PbTiO3
Room-temperature ferromagnetism and ferroelectricity in nanocrystalline PbTiO3
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DOI：
10.1016/j.solidstatesciences.2011.04.009
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发表时间：
2011-07-01
影响因子：
3.5
通讯作者：
Jiang, Minhua
中科院分区：
文献类型：
--
作者：
Zhang, Zhongli;Hu, Jifan;Jiang, Minhua
纳米PbTiO 3具有弱的室温铁磁性。真空退火提高FM，而随后的空气退火降低FM再次，表明所观察到的FM与氧空位。随着退火温度的升高，FM的降低可能是由于纳米颗粒表面的氧空位量减少。在室温下，900 ℃退火1 h的PbTiO 3颗粒表现出铁磁性（FM）和铁电性（FE）的共存，而在1000 ℃退火1 h的PbTiO 3颗粒表现出铁电性，但铁磁性消失。室温磁介电效应也观察到在PbTiO 3多铁性颗粒，表明磁和电性能之间的耦合。在H = 4.5kOe，1 kHz频率下，PbTiO_3多铁性芯块的Δ ε（r）/ε（r）（0）值达到26.2%。(C)2011年Elsevier Masson SAS。All rights reserved.
Nanocrystalline PbTiO3 could exhibit weak room-temperature ferromagnetism (FM). The vacuum annealing enhances FM, while the subsequent air-annealing lowers FM again, indicating that the observed FM is connected with the oxygen vacancies. The reduction of FM with an increase of annealing temperature may be due to the decrease of the amount of oxygen vacancies at the surface of nanograins. The coexistence of ferromagnetism (FM) and ferroelectricity (FE) at room temperature was observed in PbTiO3 pellet with an annealing temperature of 900 degrees C for 1 h, whereas FE occurs but FM disappears in PbTiO3 pellet with an annealing temperature of 1000 degrees C for 1 h. The room-temperature magnetodielectric effect was also observed in PbTiO3 multiferroic pellets, indicating the coupling between magnetic and electric properties. The value of Delta epsilon(r)/epsilon(r)(0) for multiferroic PbTiO3 pellet reaches 26.2% at 1 kHz under H = 4.5 kOe. (C) 2011 Elsevier Masson SAS. All rights reserved.