Multiferroic ceramics of Bi5Ti3Fe1-xNixO15(x=0.1,0.2,0.5,0.7) are synthesized b the conventional solid state reaction, and their microstructure, magnetic properties are investigated. X-ray diffraction patterns show that a four-layer Aurivillus phase is formed in each sample and the diffraction peaks change obviously with the temperature increasing. The Ni ion modification induces remarkable ferromagnetism (FM) at room temperature. And the x=0.2 sample has the greatest saturation magnetization Ms~0.26552 emμ/g, and the coercive field Hc~ 0.65478 kOe
In recently years, Electrical Impedance Tomography caused concern for people in the areas such as non-destructive testing and structural health monitoring. This paper took the disk structure composed of carbon fiber felt for example, designed and built the experiment platform for Electrical Impedance Tomography in a couple of different ways: one was traditional and the other was distributed acquisition system based on wireless sensor network. The imaging result showed that the data collected from wireless distributed system were more accurate and efficient.
The Electrical Resistance Tomography (ERT) is a new technology developed in recent years. Because of the characteristics as simple structure, low cost and non-invasive, the ERT has already application in geophysics, physical geography, mineral detection et al.in this paper, the ERT is used to detect the damage of the remote carbon fiber felt with wireless sensing technology. In experiment, the wireless technology is used to avoid the noise and the introduction of the long wires, which realized the remote detection; the Improved Newton -- Raphson algorithm is used to achieve the detective imaging, which had good results.
The solid solution ceramics of 0.9BiFeO3-0.1SrTiO3 (BFST) were processed under cool-high pressure (BFST-H1, BFST-H2) and high temperature-high pressure (BFST-H3). And the high pressure synthesis with different temperature was used to prepare the sample BFST-H4 and BFST-H5. X-ray diffraction showed that these ceramics are almost of single phase. Among all the samples, the 3GPa,900°C high pressure synthesized one shows the optimal ferroelectricity at room temperature, with enhanced magnetic properties was observed.
Investigation of crystal structure, dielectric, magnetic and local ferroelectric properties of the diamagnetically substituted (1-x)BiFeO3-xBi (Ti0.5Ni0.5)O3solid solutions samples have been carried out. The solid solutions have been found to possess a rhombohedrally distorted perovskite structure described by the space group R3c. Compared with pure BiFeO3compound, both ferroelectric and magnetic properties are much improved by solid solution with Bi (Ti0.5Ni0.5)O3with saturation hysteresis loops observed. Among all the samples, thex=0.1 samples shows the optimal ferromagnetism with Mr~0.56531emμ/g and the optimal ferroelectricity with Pr~5.767μC/cm2 at room temperature.
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