Ferroelectric and magnetic properties of Pb(Fe2∕3W1∕3)O3-based multiferroic compounds with cation order

Abstract

BiFeO3 and PbTiO3 were introduced to a Sc-modified Pb(Fe2/3W1/3)O3 compound with strong cation order to improve the multiferroic properties. It is found that the degree of cation order decreases as the amount of BiFeO3 or PbTiO3 increases. As a result, the saturation magnetization deteriorates. Solid solutions with BiFeO3 show an increase in both ferroelectric and magnetic transition temperatures. However, the ferroelectric remanent polarization is dramatically suppressed. In contrast, solid solution with PbTiO3 leads to an increase in the ferroelectric transition temperature, a decrease in the magnetic transition temperature, and a significant enhancement of remanent polarization. BiFeO 3 and PbTiO 3 were introduced to a Sc-modified Pb͑Fe 2/3 W 1/3 ͒O 3 compound with strong cation order to improve the multiferroic properties. It is found that the degree of cation order decreases as the amount of BiFeO 3 or PbTiO 3 increases. As a result, the saturation magnetization deteriorates. Solid solutions with BiFeO 3 show an increase in both ferroelectric and magnetic transition temperatures. However, the ferroelectric remanent polarization is dramatically suppressed. In contrast, solid solution with PbTiO 3 leads to an increase in the ferroelectric transition temperature, a decrease in the magnetic transition temperature, and a significant enhancement of remanent polarization. The composition 0.93͓0.79Pb͑Fe 2/3 W 1/3 ͒O 3 -0.21Pb͑Sc 2/3 W 1/3 ͒O 3 ͔ -0.07PbTiO 3 shows the optimized properties of T max of 208 K, P r of 3.6 C / cm 2 between 120 and 210 K, T N of 209 K, and M s of 0.23 B / f.u. ͑3.7 emu/ g͒ at 10 K under 5 T.

Cation ordering, ferrimagnetism and ferroelectric relaxor behavior in Pb(Fe1−xScx)2∕3W1∕3O3 solid solutions

“…For PFSWO with x between 0.1 and 0.4 the main peaks are split, which reflects the formation of two cubic perovskite phases: a major phase of symmetry F m3m and a minor phase of symmetry P m3m. This conclusion is consistent with earlier work [41,42] where all PFSWO samples contained a mixture of phases. As the value of x is increased, the magnitude of the peak splitting diminishes and the relative intensity of the peaks at lower angle decreases, implying that the relative amount of the P m3m perovskite phase decreases; e.g.…”

“…The position and intensities of the reflections in the XRPD patterns of the annealed samples were consistent with those expected for PFWO and PFSWO-based solid solutions with cubic perovskite structure [41,42,47]. Reflections from secondary phases were not detected in the XRPD patterns.…”

“…One way to tune the magnetic properties of PFWO is to control the degree of ordering of Fe 3+ and W 6+ cations as this leads to a change of the number of magnetic ions in neighbouring cells. Promising results were reported in the case of Sc doping [41,42]. Furthermore, although major advances have been made in optimizing PFWO for a variety of applications, several fundamental aspects of their behaviour, in particular, the nature of the compositional ordering and its relation to the relaxor properties, have remained poorly defined and somewhat controversial [43][44][45][46].…”

Structural, magnetic, and optical properties ofBiFeO3andBi2FeMnO6Bi1, Taussig2, Kim3 et al. 2008Phys. Rev. B165131022View full textAdd to dashboardCite

“…Ordered double perovskites, in which two different B-site cations form a superlattice within the ABO 3 perovskite structure, have attracted great interest recently. [1][2][3][4][5] Materials with such a structure may possess both ferromagnetic and ferroelectric, or ferromagnetic and ferroelastic properties, and are therefore multiferroics. [6][7][8] Among these materials, room temperature ͑RT͒ ordered double perovskites with bismuth on the A site are particularly interesting.…”

Электродинамические характеристики твердых растворов Pb(Fe-=SUB=-1-x-=/SUB=-Sc-=SUB=-x-=/SUB=-)-=SUB=-2/3-=/SUB=-W-=SUB=-1/3-=/SUB=-O-=SUB=-3-=/SUB=- в широком спектральном диапазоне

“…Сравнительно недавно было установлено, что замещение ∼ 15 at.% катионов Fe 3+ на Sc 3+ , приводящее к частичному упорядочению в B-позиции перовскита, приводит к образованию ферримагнитного состояния с остаточной намагниченностью до 0.61 µ B /ABO 3 f.u. [17,18]. Наряду с установлением магнитного порядка, подстановка скандия позволяет сохранить релаксорные сегнетоэлектрические свойства, в то время как подстановка Mn резко подавляет спонтанную поляризацию.…”