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首页> 外文期刊>RSC Advances >Multiferroic properties of Bi0.5K0.5TiO3-BiFe1-xCoxO3 (0 <= x <= 0.2) solid solution
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Multiferroic properties of Bi0.5K0.5TiO3-BiFe1-xCoxO3 (0 <= x <= 0.2) solid solution

机译：Bi0.5K0.5TiO3-BiFe1-xCoxO3（0 <= x <= 0.2）固溶体的多铁性

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摘要

The fabrication of BiFeO3 and Bi0.5K0.5TiO3 typically encounters problems with densification and phase purity, requiring conditions of high pressure for the synthesis of bulk phases. In this letter, we have successfully prepared a binary lead-free solid-solution of Bi0.5K0.5TiO3-BiFe1-xCoxO3 using a modified Pechini method and investigated the magnetic and ferroelectric properties of Bi0.5K0.5TiO3-BiFe1-xCoxO3 (0 <= x <= 0.2). The coexistence of room-temperature ferromagnetism and ferroelectricity is observed in Bi0.5K0.5TiO3-BiFe1-xCoxO3 (0.5 <= x <= 0.2). The x = 0.2 sample exhibits ferromagnetic behavior with a Curie temperature T-C of 661 K, compared with the paramagnetic like behavior exhibited in Bi0.5K0.5TiO3-BiFeO3 at room temperature. The ferromagnetism can be ascribed to the suppression of a spiral spin structure with the canting of the anti-ferromagnetically ordered spins caused by structural distortion due to the substitution of Co ions. The x = 0.2 sample also exhibits a well-defined ferroelectric hysteresis loop with a rather large remnant polarization (P-r = 32.72 mu C cm(-2)), which is superior to that of other lead-free ferroelectric compounds. The improved ferroelectric properties can be attributed to the increased grain size and lattice distortion caused by Co doping. The observation of room temperature ferromagnetism and ferroelectricity for Bi0.5K0.5TiO3-BiFe1-xCoxO3 suggests that these materials are potential candidates for multiferroic materials and ferroelectric memory devices.
机译：BiFeO3和Bi0.5K0.5TiO3的制造通常会遇到致密化和相纯度方面的问题，这需要高压条件来合成本体相。在本文中，我们已使用改良的Pechini方法成功制备了Bi0.5K0.5TiO3-BiFe1-xCoxO3的二元无铅固溶体，并研究了Bi0.5K0.5TiO3-BiFe1-xCoxO3的磁和铁电性能（0 <= x <= 0.2）。在Bi0.5K0.5TiO3-BiFe1-xCoxO3（0.5 <= x <= 0.2）中观察到室温铁磁和铁电共存。 x = 0.2样品在居里温度T-C为661 K时表现出铁磁行为，而Bi0.5K0.5TiO3-BiFeO3在室温下表现出类似顺磁行为。铁磁性可以归因于螺旋形自旋结构的抑制，其中由于由Co离子的替换引起的结构变形引起的反铁磁有序自旋的倾斜。 x = 0.2样品还表现出定义良好的铁电磁滞回线，具有相当大的剩余极化（P-r = 32.72μC cm（-2）），优于其他无铅铁电化合物。铁电性能的改善可归因于由Co掺杂引起的晶粒尺寸增加和晶格畸变。对Bi0.5K0.5TiO3-BiFe1-xCoxO3的室温铁磁性和铁电的观察表明，这些材料是多铁材料和铁电存储设备的潜在候选者。

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