已为您找到该学者10条结果 成果回收站
【期刊论文】Structure and negative thermal expansion in the PbTiO3–BiFeO3 system
陈骏, J. Chen, X. R. Xing, G. R. Liu, J. H. Li and Y. T. Liu
APPLIED PHYSICS LETTERS 89, 101914 (2006),-0001,():
-1年11月30日
The structures of (1−x) PbTiO3–xBiFeO3 (x=0.3 and 0.6) were investigated by means of the neutron powder diffraction. A splitting shift between Fe and Ti atoms was found along the c axis in 0.7PbTiO3–0.3BiFeO3; however, this splitting does not appear in 0.4PbTiO3–0.6BiFeO3. The tetragonal phase of PbTiO3–BiFeO3 exhibits a large spontaneous polarization. The negative thermal expansion of PbTiO3 is significantly enhanced in a wide temperature range by the BiFeO3 substitution. The average bulk thermal expansion coefficient of 0.4PbTiO3–0.6BiFeO3 is ā v =−3.92×10−5 °C−1, which is much strong in the known negative thermal expansion oxides.
-
50浏览
-
0点赞
-
0收藏
-
0分享
-
491下载
-
0
-
引用
【期刊论文】Thermal Expansion Properties of Lanthanum-Substituted Lead Titanate Ceramics
陈骏, Jun Chen, Xianran Xing, Ranbo Yu, and Guirong Liu
J. Am. Ceram. Soc., 88 [5] 1356–1358 (2005) ,-0001,():
-1年11月30日
The Pb1-xLaxTiO3 powders were prepared by a sol-gel route in the composition range from x=0.0 to 0.3 in 0.05 increments. The lattice parameters of Pb1-xLaxTiO3 (x=0.0, 0.05, 0.10, 0.15, 0.20, 0.30) were determined by a high temperature X-ray diffraction, and the intrinsic thermal expansion coefficients were obtained in the temperature range from room temperature to 9001C. The Pb1-xLaxTiO3 compounds (x=0.10, 0.15, 0.20) in the tetragonal system exhibit low thermal expansion behaviors. As the La content is increased, the phase transition in the Pb1-xLaxTiO3 changes continuously from conventional to diffuse phase transition
-
64浏览
-
0点赞
-
0收藏
-
0分享
-
199下载
-
0
-
引用
【期刊论文】Thermal expansions of ceramics in the system Pb1−x(La1/2K1/2)xTiO3
陈骏, Jun Chen, Xianran Xing, Jinxia Deng, Guirong Liu
Journal of Alloys and Compounds 372 (2004) 259–266,-0001,():
-1年11月30日
The solid solution limit of Pb1−x(La1/2K1/2)xTiO3 was determined in the composition range of 0 ≤ x < 1. The compounds of Pb1−x(La1/2K1/2)xTiO3 were indexed in a tetragonal system for 0 ≤ x ≤ 0.4 and indexed in a cubic one for 0.45 ≤ x < 1 at room temperature. A tiny amount of La2Ti2O7 pyrochlore phase was detected in the sample Pb1−x(La1/2K1/2)xTiO3 for x = 1.0. The lattice parameters of Pb1−x(La1/2K1/2)xTiO3 (x = 0.1, 0.2, 0.3, 0.4, 0.6, 0.8) were determined by high temperature XRD, and their intrinsic thermal expansion coefficients were obtained in the temperature range from room temperature to 900 ◦C. In the temperature range from room temperature to the Curie point, the compound Pb0.8(La1/2K1/2)0.2TiO3 has a low intrinsic thermal expansion coefficient (−7.1×10−6 ◦C−1), which is the value closest to zero in all the investigated compounds. The (ferroelectric) Curie temperatures of Pb1−x(La1/2K1/2)xTiO3 could be predicted from our experimental results for 0≤x≤0.4.
Solid solution Pb1−x(, La1/, 2K1/, 2), xTiO3, Phase transition, High temperature X-ray powder diffractometry (, HTXRPD), , Thermal expansion, Curie temperature
-
43浏览
-
0点赞
-
0收藏
-
0分享
-
178下载
-
0
-
引用
【期刊论文】Structural investigations on ferroelectric Pb1−3/2xLaxTiO3 using the x-ray Rietveld method
陈骏, Jun Chen, Xianran Xing, Ranbo Yu, Guirong Liu, Li Wu and Xiaolong Chen
J.Mater.Res. , Vol. 19, No. 12, Dec 2004,-0001,():
-1年11月30日
The structures of the defect perovskite Pb1−3/2xLaxTiO3 prepared by the solid-state method were investigated in the solubility range of 0.05≤x≤0.30 with 0.05 increment by x-ray Rietveld method. In the system Pb1−3/2xLaxTiO3, the atom displacements of Ti (δTi) and Pb/La (δPb/La) along the spontaneous polarization (Ps) direction (c axis) decrease nonlinearly with increasing La content, while the value of δTi/δPb/La decreases linearly. The shape of oxygen octahedron of compounds Pb1−3/2xLaxTiO3 is independent of the La content. The calculated value of Ps decreases linearly in the solubility range of 0.05≤x ≤0.30. In the refinement process, the hkl dependence of diffraction line broadening was also taken into account. The anisotropy of microstrain-like broadening observed in Pb1−3/2xLaxTiO3 might be ascribed to occurrence of compositional inhomogeneity between the crystallites.
-
53浏览
-
0点赞
-
0收藏
-
0分享
-
228下载
-
0
-
引用
【期刊论文】Zero Thermal Expansion in PbTiO3-Based Perovskites
陈骏, Jun Chen, Xianran Xing, Ce Sun, Penghao Hu, Ranbo Yu, Xiaowei Wang, and Lihong Li
American Chemical Society,-0001,():
-1年11月30日
-
44浏览
-
0点赞
-
0收藏
-
0分享
-
256下载
-
0
-
引用