Key Engineering Materials Vols. 336-338

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https://doi.org/10.4028/www.scientific.net/KEM.336-338

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Paper Title Page

Epitaxial Growth and Electrical Characterization of PBZT Thin Films by RF Magnetron Sputtering Deposition

Authors: Hui Qing Fan, Lai Jun Liu, Xiu Li Chen, Jie Zhang, Wei Wang

Abstract: Barium modified lead zirconate titanate (PBZT) thin films were grown epitaxially on Pt/Ti/SiO2/Si substrates by radio-frequency magnetron sputtering deposition and characterized by X-ray diffraction and scanning electron microscopy. Depending on the growth condition, a wide variation of crystal structure and morphology was evolved in PBZT thin films. The formation of phase structure and pyrochlore phase was strongly dependent on the oxygen partial pressure and re-evaporation of lead from the films during the deposition. Perovskite films were obtained by optimizing the deposition conditions and analyzed by the ferroelectric hysteresis (P~E).

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Microstructure Characteristics in the BaTiO₃-La₂O₃-Nb₂O₅ Ternary System

Authors: Yue Hui Wang, Ting Wang, Shi Kao Shi, Jian Hong Shen, Ji Zhou

Abstract: A series of powders of (Ba1-xLa2x/3)(Ti1-xNb4x/5)O3 (0.05≤x≤0.3) have been synthesized by solid-state reaction route, and the effects of the dopants on the microstructure of BaTiO3 were investigated by XRD, SEM, HTEM and EDS in the BaTiO3-La2O3-Nb2O5 ternary system. It was found that the secondary titanium-rich phase occurred for x ≤ 0.1, while Ba3La3Ti5Nb5O30 yields as secondary phase for x ≥ 0.2. In the whole range of 0.05 ≤ x ≤ 0.3, the crystal structure of BaTiO3 solid solutions is cubic system. There are two substitution modes in the system: the substitution mode of La ions dissolved into Ba sites is significant for x ≤ 0.2, but the substitution mode of Nb ions dissolved into Ti sites is significant for x>0.2. TEM observation and EDS analysis revealed that the concentration gradient of Nb existed and La almost distributed homogeneously in a grain. Thus, the dielectric materials composed of La-Nb-codoped BT are not fitted to form the core-shell structure for the higher dopants.

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Ferroelectric Properties of Bi_3.4Y_0.6Ti₃O₁₂ Thin Films Prepared by a Modified Sol-Gel Process

Authors: Hong Cheng Liu, Biao Wang

181

Phase Structure and Electrical Properties of Bi_1/2Na_1/2TiO₃-KNbO₃ Lead-Free Piezoelectric Ceramics

Authors: Wen Zhong Lu, Gui Fen Fan, Xiao Hong Wang, Fei Liang

Abstract: Lead-free (1-x) Bi1/2Na1/2TiO3-xKNbO3 (x=0, 0.01, 0.02, 0.04, 0.05 0.06, 0.10) piezoelectric ceramics were prepared by conventional ceramics fabrication technique. The results of x-ray diffraction (XRD) show that these ceramics possess pure perovskite structures with a symmetry transition from rhombohedral to cubic at about x = 0.05. The piezoelectric properties of these ceramics were reported and found to reach extreme values at x = 0.04 with d33 up to 113pC/N and kp up to 22%. The temperature dependence of dielectric constant and dielectric loss of these ceramics were also investigated. The Curie temperature and depolarization temperature dropped with the increase of KNbO3 amount.

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Sintering and Dielectric Properties of Excess Bi₂O₃ Doped BaBi₂Nb₂O₉ Ceramics

Authors: Ho Hua Chung, Cheng Fu Yang, Yi Chang Chung, Cheng Yuan Kung

Abstract: In this study, ferroelectric materials with Bi-layered structure BaBi2Nb2O9 with excess x wt% Bi2O3 (x=0, 1.5, and 3) are investigated as the main compositions, and the sintering is proceeded from 1000oC~1100oC. The effect of Bi2O3 on the morphologies, crystal structure, and dielectric characteristics of BaBi2Nb2O9 ceramics is developed with the aid of SEM, X-ray diffraction, and dielectric-temperature curves. Dielectric properties are investigated in the temperature of 25oC~ 465oC at frequency 10KHz~1MHz. It is found that sintering temperature and Bi2O3 content has no apparent influence on the Curie temperatures, but they have large influence on the maximum dielectric constants.

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Preparation of Bi-Layered SrBi₂Ta_2-xV_xO₉ Ceramics (0.1 ≦ x ≦ 0.4)

Authors: Chien Chen Diao, Cheng Fu Yang, Chao Chin Chan, Cheng Yuan Kung

192

Microwave Dielectric Properties of Ca[(Li_1/3Nb_2/3)_0.95Zr_0.15]O_3+δ Ceramics with Ba²⁺ Substitution at A-Site

Authors: Dong Xiang Zhou, G. Xiong, Shu Ping Gong, Jun Zhao, M.Z. Hu, H. Li

Abstract: The microwave properties of (Ca1-xBax)[(Li1/3Nb2/3)0.95Zr0.15]O3+δ(0.0≤x≤0.2, CBLNZ) ceramics were investigated. A single phase with orthorhombic perovskite structure was obtained at x = 0.0 − 0.025. Both the εr and Qf value firstly increased with increasing Ba2+ content, and then began to decrease at x = 0.025. The τf value increased from −9.4 ppm/°C at x=0.0 to 18ppm/°C at x=0.2, which could be explained by the decrease of B-site bond valence in perovskite structure.

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Influence MnO₂ on the Properties of (Li_xNa_yK_1-x-y)NbO₃ Ceramics

Authors: Qiang Chen, De Jun Lan, Yi Chen, Du Min Lin, Xi Yue, Ding Quan Xiao, Jian Guo Zhu

Abstract: Lead-free piezoelectric ceramics lithium sodium potassium niobate (LixNayK1-x-y)NbO3 (LNKN100x/100y) have been synthesized by a conventional solid state process. The effects of MnO2 addition on the properties of (LixNayK1-x-y)NbO3(x=0.06, y=0.5)(LNKN6/50) ceramics were investigated. It was found that a morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases is in the composition range 0.05

199

Preparation of Ferroelectric K_0.5Na_0.5NbO₃ Films by Sol-Gel Processing

Authors: Feng Ping Lai, Jing Feng Li, Wen Gong

Abstract: Orthorhombic perovskite-type K0.5Na0.5NbO3 (KNN) films on Pt/Ti/SiO2/Si substrates were prepared by sol-gel processing. The morphology of the films was characterized using SEM and AFM. The KNN films with a total thickness of about 0.5 micron had relatively dense and uniform microstructure. The ferroelectricity of the KNN films was confirmed by polarization-electric field (P-E) hysteresis loop.

203

Composition Range of Morphotropic Phase Boundary and Electrical Properties of NBT-BT System

Authors: Ye Jing Dai, Jin Song Pan, Xiao Wen Zhang

Abstract: (Na0.5Bi0.5)TiO3 (BNT) system ceramics are considered to be an excellent candidate for leadfree piezoelectric ceramics. In this paper, (1–x)Na0.5Bi0.5TiO3-xBaTiO3 (x = 0.03 ~ 0.10) was synthesized by conventional mixed-oxide technique. The powders were calcined at 950oC for 2 h and the pressed disks were sintered at 1145oC for 2 h in air atmosphere. The phase structure was investigated by X-ray diffraction technique (XRD). It is revealed that the morphotropic phase boundary (MPB) lies in a narrow composition range of x=0.05–0.08 but not a unique composition (x = 0.055 or 0.06) as shown before [1-4]. The microstructures of the ceramics were investigated by scanning electron microscopic. In addition, the piezoelectric and dielectric properties of this system were also investigated. It was indicated that both the piezoelectric and dielectric properties are better with the compositions lie near the tetragonal phase within the MPB than that whose compositions lie near the rhombohedral phase.

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