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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Structural, Dielectric, and Optical Properties of Ni-Doped Barium Cadmium Tantalate Ceramics
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Structural, Dielectric, and Optical Properties of Ni-Doped Barium Cadmium Tantalate Ceramics

机译：掺镍钽酸钡镉陶瓷的结构，介电和光学性能

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摘要

We report the effect of Ni-doping on the structural, dielectric and optical properties of Ba(Cd_(1/3)Ta_(2/3))O_3 (BCT) ceramics. Rietveld analysis of the X-ray diffraction (XRD) data indicates that the BCT structure is similar to other Ba(B′_(1/3)B″_(2/3))O_3 perovskites, although the Ta-O-Cd is distorted to an angle of ～173°; very close to our earlier theoretical prediction of 172°. The XRD analysis also indicates that Ni doping significantly enhances the extent of Cd-Ta ordering in BCT. The temperature coefficient of resonant frequency decreases with Ni concentration up to 2 wt %. While the loss tangent of BCT is reduced at small levels of Ni doping (up to 0.5 wt %), it increases abruptly at higher concentrations. We found a correlation between the loss tangent of Ni-doped BCT samples and the intensity of a continuous absorption background in the optical spectra. This optical activity results from the presence of optically active point defects and is suggestive that these defects play an important role in the microwave loss in BCT ceramics.
机译：我们报道了镍掺杂对Ba（Cd_（1/3）Ta_（2/3））O_3（BCT）陶瓷的结构，介电和光学性能的影响。对X射线衍射（XRD）数据的Rietveld分析表明，尽管Ta-O-Cd，BCT结构与其他Ba（B'_（1/3）B''_（2/3））O_3钙钛矿相似变形到〜173°的角度；非常接近我们先前对172°的理论预测。 XRD分析还表明，Ni掺杂显着提高了BCT中Cd-Ta有序程度。随着Ni浓度达到2重量％，共振频率的温度系数降低。在少量的Ni掺杂（至多0.5 wt％）下，BCT的损耗角正切减小，而在更高的浓度下，BCT的损耗角正切突然增加。我们发现镍掺杂的BCT样品的损耗角正切与光谱中连续吸收背景的强度之间存在相关性。这种光学活性是由于存在光学活性点缺陷而引起的，表明这些缺陷在BCT陶瓷的微波损耗中起重要作用。

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