Effects of BaNb2O6 addition on microstructure and dielectric properties of BaTiO3 ceramics

Gao, Pan; Pu, Yongping; Пин, Ли; Wu, T. H.

doi:10.1007/s10854-013-1347-3

Cited by 6 publications

(1 citation statement)

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“…The dielectric material with the ''core-shell'' microstructure composed of chemically inhomogeneous grain is considered as a key factor to satisfy XR characteristics [2,3]. BaTiO 3 based ceramics are modified by the doping species such as BaNb 2 O 6 [4], CaZrO 3 [5], and oxides [6][7][8] to obtain a core-shell structure, which can satisfy the requirements of X8R characteristics (4C/ C 25°C = ±15 % or less, -55 to 150°C). But there are few report that systems without ''core-shell'' structure or two dielectric peaks can satisfy the requirement of the XR temperature range [9].…”

Section: Introductionmentioning

confidence: 99%

Structure, dielectric and impedance properties of BaTiO3–Bi(Y0.5Yb0.5)O3 lead-free ceramics

Huang

Liu

Hao

et al. 2015

J Mater Sci: Mater Electron

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1 -x)BaTiO 3 -xBi(Y 0.5 Yb 0.5 )O 3 (BT-BYYb, x = 0.01-0.12) ceramics were prepared via solid-state processing techniques. The structure, dielectric and impedance properties of (1 -x)BT-xBYYb ceramics are studied. The studies show that the ceramics are in tetragonal phase when x B 0.07, transform to pseudocubic phase at x C 0.08. The grain growth is obviously suppressed for (1 -x)BT-xBYYb samples with x value. Dielectric properties are depressed and dielectric peaks are broadened with x. T m first increases and then decreases. BT-BYYb system exhibits diffused phase transition and good temperature stability, which is due to the increased cation disorder, forming the local difference of the polar region due to the size and charge difference and inducing many different regions with different Curie points. The samples can meet the temperature requirements of X8R characteristics at 1 kHz with: e * 1330, tand * 0.0076, |4C/C| B ±15 % (-55 to 150°C) for x = 0.11 and e * 1032, tand * 0.012, |4C/C| B ±15 % (-55 to 170°C) for x = 0.12, respectively. The activation energy of the bulk material obtained from conduction and relaxation first increases and then decreases with increasing BYYb concentration. The different activation energy indicates various mechanisms are involved in the conduction and relaxation process, which may be due to the mixed conduction or doubly ionized oxygen and thermal motions of titanium ions (Ti 4? ) or doubly ionized oxygen, respectively.

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