Novel Raman spectroscopy of a strong high-k diffuse phase transition (Ba<sub>1∿span style='font-style: italic'>xsub>Sm<sub>xsub>)(Ti<sub>0.95∿span style='font-style: italic'>x/4sub>Ce<sub>0.05sub>)O<sub>3sub> ceramics
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- 作者：Dan-Dan Han ; Qiao-li Liu ; Yan-Dong Wang ; Chang-Hao Wang ; Da-Yong Lu<sup> ; sup><sup>cninjp11232000@yahoo.com" class="auth_mail" title="E-mail the corresponding authorsup><sup> ; sup><sup>dylu@jlict.edu.cn" class="auth_mail" title="E-mail the corresponding authorsup>
- 关键词：B. Defects ; C. Dielectric properties ; D. BaTiO3 and titanates ; Powders ; solid state reaction and sintering
- 刊名：Ceramics International
- 出版年：2016
- 出版时间：15 May 2016
- 年：2016
- 卷：42
- 期：7
- 页码：8815-8821
- 全文大小：3631 K
文摘
Novel Raman spectra were discovered in (Ba<sub>1<strong class="boldFont">−strong>xsub>Sm<sub>xsub>)(Ti<sub>0.95<strong class="boldFont">−strong>x/4sub>Ce<sub>0.05sub>)O<sub>3sub> (0.03≤x≤0.10) ceramics and investigated in relation to the fluorescent effect of Sm<sup>3+sup> ions. Special interest was paid to analyze the dielectric response and defect chemistry associated with the structural evolution by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), Raman spectroscopy (RS), and dielectric measurements. Complete solid solutions, known as BS5TC5 and BS6TC5 for (Ba<sub>1<strong class="boldFont">−strong>xsub>Sm<sub>xsub>)(Ti<sub>0.95<strong class="boldFont">−strong>x/4sub>Ce<sub>0.05sub>)O<sub>3sub> ceramics were found to form at x=0.05 and 0.06 (approximately) and exhibit a cubic structure and a non-uniform microstructure. BS6TC5 exhibited a strong high-k diffuse phase transition (DPT) behavior (<span id="mmlsi0003" class="mathmlsrc">source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216300645&_mathId=si0003.gif&_user=111111111&_pii=S0272884216300645&_rdoc=1&_issn=02728842&md5=74582dabb24de1d7399948fbb490bc34">![]()
ss="imgLazyJSB inlineImage" height="11" width="11" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0272884216300645-si0003.gif"><noscript>![]()
style="vertical-align:bottom" width="11" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0272884216300645-si0003.gif">noscript><span class="mathContainer hidden"><span class="mathCode">span>span>span>=9300, T<sub>Csub>=78 °C), a lower dielectric loss (tan δ<0.05), and a feature of mixed valence at Ba sites (Sm<sup>3+sup>, Ce<sup>3+sup>) and Ti sites (Sm<sup>3+sup>, Ce<sup>4+sup>). The BSTC ceramics with x=0.09 met the Y5V specification. A weak g=2.004 EPR signal associated with ionized Ti-vacancy defects appeared in single-phase ceramics.