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首页> 外文期刊>Physica status solidi, B. Basic research >Neutron powder diffraction study of Pb[Zr-x(Fe2/3W1/3)(1-x)]O-3 solid solutions
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Neutron powder diffraction study of Pb[Zr-x(Fe2/3W1/3)(1-x)]O-3 solid solutions

机译：Pb [Zr-x（Fe2 / 3W1 / 3）（1-x）] O-3固溶体的中子粉末衍射研究

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This study presents the structural and magnetic properties of solid solutions Pb[Zr-x(Fe2/3W1/3)(1-x)]O-3 (PZFW), with x=0.35 and 0.60. The focus is on the study of magnetic ordering and the co-existing electrical dipole moments as a function of temperature. Neutron powder diffraction (NPD) measurements showed that both samples possess a pseudo-cubic structure. A G-type antiferromagnetic (AFM) order onsets at around 150K in PZFW with x=0.35, accompanied by a broad hump in the magnetization, magnetic peak width determined from the NPD patterns, and thermal expansion versus temperature curve, which indicate a diffusive phase transition. Weak anomalous thermal expansion was assigned to the spontaneous magnetostriction. A susceptibility cusp characteristic to an AFM ordering was observed at 15K though no evident change was observed in the NPD patterns at 12K. The magnetic behavior is assigned to different size clusters: with decreasing temperature a larger fraction of the material becomes magnetically ordered. Remnant magnetization was observed in PZFW with x=0.35 at 2K. No magnetic reflections were seen in PZFW with x=0.60 down to 12K. Magnetometer measurements revealed a weak AFM cusp at 8K, confirmed by hysteresis loop measurements. The off-center Pb-displacements and the oxygen octahedra displacement along the cubic axis with respect to the B-cations generate an electric dipole moment. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
机译：这项研究提出了固溶体Pb [Zr-x（Fe2 / 3W1 / 3）（1-x）] O-3（PZFW）的结构和磁性，x = 0.35和0.60。重点是研究磁有序性和共存的电偶极矩随温度的变化。中子粉末衍射（NPD）测量表明，这两个样品均具有伪立方结构。 G型反铁磁（AFM）顺序在PZFW中于150K左右开始出现，x = 0.35，伴随着宽泛的磁化峰，由NPD模式确定的磁峰宽度以及热膨胀-温度曲线，这表明存在扩散相过渡。弱的异常热膨胀被归因于自发的磁致伸缩。尽管在12K的NPD模式中没有观察到明显的变化，但在15K时观察到了AFM有序的敏感性尖峰。磁性行为被分配给不同尺寸的簇：随着温度的降低，大部分材料会变成磁性有序的。在PZFW中，在2K下x = 0.35时观察到剩余磁化强度。在x = 0.60至12K的PZFW中没有看到磁反射。磁强计的测量结果显示，在8K时，AFM尖头较弱，这通过磁滞回线测量得到了证实。偏心的Pb位移和氧八面体相对于B阳离子沿立方轴的位移产生电偶极矩。 （C）2015 WILEY-VCH Verlag GmbH＆Co.KGaA，Weinheim

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