Novel Incipient Ferroelectrics Based on Ba4MNbxTa10–xO30where M = Zn, Mg, Co, Ni
Novel Incipient Ferroelectrics Based on Ba4MNbxTa10–xO30where M = Zn, Mg, Co, Ni
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DOI：
10.1021/cm200117y
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发表时间：
2011-05
影响因子：
8.6
通讯作者：
Lianzhou Wang;Y. Sakka;D. Rusakov;Y. Mozharivskyj;T. Kolodiazhnyi
中科院分区：
文献类型：
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作者：
Lianzhou Wang;Y. Sakka;D. Rusakov;Y. Mozharivskyj;T. Kolodiazhnyi
我们报道了标题化合物的结构、介电、磁性和拉曼光谱数据。对单晶衍射数据的分析表明，标题化合物的基态可以在Cm空间群内表征。Ba4MTa10O30化合物表现出典型的初生铁电体特征，即其介电常数在冷却时逐渐增大，在10K以下趋于稳定或略有下降。用粉末X射线衍射法和电子探针显微分析测定了1450-1600°C平衡的Ba4MNbxTa10-xO30组分的Nb溶度极限x。Nb替代Ta导致低温介电异常具有弛豫型特征。钴和镍基化合物在2-300K范围内表现出顺磁行为，没有显示出磁性的长程有序。
We report on structural, dielectric, magnetic and Raman data of the title compounds. Analysis of the single crystal diffraction data reveals that the ground state of the title compounds can be characterized within theCmspace group. The Ba4MTa10O30compounds show typical features of incipient ferroelectrics, i.e., their dielectric constant gradually increases on cooling and levels off or slightly decreases below 10 K. Nb solubility limit,x, for Ba4MNbxTa10–xO30compositions equilibrated at 1450–1600 °C was determined by powder XRD and by electron probe microanalysis. Substitution of Nb for Ta leads to the low-temperature dielectric anomaly having a relaxor-type signature. The Co- and Ni-based compounds show paramagnetic behavior in the 2–300 K range with no indication of the magnetic long-range order.