Dielectric properties and microstructures of non-reducible high-temperature stable X9R ceramics
Dielectric properties and microstructures of non-reducible high-temperature stable X9R ceramics
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DOI：
10.1016/j.jeurceramsoc.2013.02.021
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发表时间：
2013-09
影响因子：
5.7
通讯作者：
Sea-Fue Wang;Jian-Hua Li;Y. Hsu;Yu-Chuan Wu;Yuanming Lai;Minghua Chen
中科院分区：
文献类型：
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作者：
Sea-Fue Wang;Jian-Hua Li;Y. Hsu;Yu-Chuan Wu;Yuanming Lai;Minghua Chen
本研究成功制备了基于（1−x）BaTiO 3-xLiTaO 3（BT-xLT）组分前体且不含铅和铋成分的新型X9 R陶瓷。在97%N_2 - 3%H_2还原气氛中于1150-1250°C烧结后，烧结体中的主相为BaTiO_3和Ba_2Li_（Ta_5）O_（15），次相为Li_2 TiO_3。随着前驱体中x值的增加，Ba_2LiTa_5O_（15）相对应的XRD峰的强度增加。烧结陶瓷的晶粒尺寸似乎落在0.3和0.5μm之间的范围内，并且随着BT-xLT陶瓷的x值的增加而略微增加。BT-0.25LT陶瓷的介电性能最好，其介电常数为895，tanδ分别为1.01%和7.1%，TCC分别为−3.04%和− 14.80%，在25°C和200°C下的电阻率分别为9.9× 1012和1.6×1012Ωcm。
New X9R dielectrics based on the precursors of (1−x) BaTiO3–xLiTaO3(BT–xLT) compositions and containing no lead and bismuth constituents were successfully prepared in this study. After sintering at 1150–1250°C in a reducing atmosphere of 97%N2–3%H2, major phases including BaTiO3and Ba2LiTa5O15and a minor phase of Li2TiO3were identified in the sintered ceramics. The intensities of the XRD peaks corresponding to the Ba2LiTa5O15phase rose with the increasing x value in the precursors. The grain sizes of the sintered ceramics appeared to fall in the range between 0.3 and 0.5μm and slightly increased with the x value of the BT–xLT ceramics. The best composition in term of dielectric properties was found in the BT–0.25LT ceramic, which was marked with a dielectric constant of 895, tanδ of 1.01% and 7.1%, TCCs of −3.04% and −14.80%, and electrical resistivities of 9.9×1012and 1.6×1012Ωcm, respectively at 25°C and 200°C.