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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >High dielectric permittivity in the microwave region of SrBi_ 2Nb_ 2O_ 9 (SBN) added La_ 2O_ 3, PbO and Bi_ 2O_ 3, obtained by mechanical alloying
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High dielectric permittivity in the microwave region of SrBi_ 2Nb_ 2O_ 9 (SBN) added La_ 2O_ 3, PbO and Bi_ 2O_ 3, obtained by mechanical alloying

机译：通过机械合金化获得的La_2O_3，PbO和Bi_2O_3加入SrBi_2Nb_2O_9（SBN）的微波区域中的高介电常数

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This paper presents the microwave dielectric properties and a structural study of SrBi_ 2Nb_ 2O_ 9 (SBN) added La_ 2O_ 3, PbO or Bi_ 2O_ 3 obtained by a solid state procedure. High-energy mechanical milling was used to reduce the particle size, which allows for a better shaping of the green body and an increased reactivity. The mechanical milling activation process produced a reduced sintering temperature in the material, decreasing the loss of the volatile elements and controlling the growth of the grain that is produced when a high temperature is required to obtain dense ceramics. The incorporation of La~ (3+), or Pb~ (2+), or Bi~ (3+) of different amounts (0, 3, 5, 10 and 15wt%) was used to improve the densification without changing the crystal structure, since with a low doping content these ions can occupy the A site of the perovskite blocks; they can also occupy the Bi~ (3+) sites in Bi_ 2O_ 3 layers. A single orthorhombic phase was formed after calcination at 800°C for 2h. X-ray diffraction, Fourier transformation, infrared and Raman spectroscopy have been carried out in order to investigate the effects of doping on SBN. The dielectric permittivity (ε_ r) and loss in the microwave region (24GHz) of SBN ceramics with additions of Bi_ 2O_ 3, La_ 2O_ 3 and PbO were studied. Higher values of permittivity (ε_ r=154.6) have been obtained for the SBN added La (15wt%); a lower loss (t_ g δ=0.01531) was also achieved in the SBN added La (15wt%) sample with PVA and TEOS, respectively. The samples that showed the highest dielectric permittivities were all lanthanum doped, all with values of permittivity above 90. A comparative study associated with different types of binders was completed (with glycerin, PVA and TEOS). This procedure allowed us to obtain phases at lower temperatures than usually appear in the literature. The microwave dielectric properties (permittivity and loss) in the region 24GHz, were studied for all samples. The structural and microwave dielectric properties of SBN show a high potential for applications in the microwave region for filters, antennas etc.
机译：本文介绍了微波介电性能和结构研究的SrBi_2Nb_2O_9（SBN）添加固态过程获得的La_2O_3，PbO或Bi_2O_3。使用高能机械研磨来减小粒径，这可以使生坯更好地成形并提高反应性。机械研磨活化过程在材料中降低了烧结温度，减少了挥发性元素的损失，并控制了需要高温以获得致密陶瓷时产生的晶粒的生长。使用La（3+）或Pb〜（2+）或Bi〜（3+）不同量（0、3、5、10和15wt％）的掺入可改善致密性而不改变晶体由于掺杂量低，这些离子可以占据钙钛矿块的A位;它们也可以占据Bi_2O_3层中的Bi〜（3+）站点。在800°C煅烧2h后形成一个正交相。为了研究掺杂对SBN的影响，已经进行了X射线衍射，傅立叶变换，红外和拉曼光谱。研究了添加Bi_2O_3，La_2O_3和PbO的SBN陶瓷的介电常数（ε_r）和微波区域（24GHz）的损耗。对于添加了SBN的La（15wt％），已经获得了更高的介电常数（ε_r = 154.6）。在分别添加了PVA和TEOS的SBN加入La（15wt％）的样品中也实现了更低的损耗（t_ gδ= 0.01531）。显示最高介电常数的样品都是镧掺杂的，所有介电常数的值都在90以上。完成了与不同类型的粘合剂（甘油，PVA和TEOS）相关的比较研究。该方法使我们能够在比文献中通常出现的温度更低的温度下获得相。对所有样品都研究了在24GHz范围内的微波介电特性（介电常数和损耗）。 SBN的结构和微波介电性能显示了在微波区域中用于滤波器，天线等的巨大潜力。

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