Qing GONG
,
Xiaoming CAO
,
Jinsong ZHANG
,
Zheng FANG
材料科学技术（英）
3D reticulated ceramics (3DRCs) with the composition containing SrFe12O19-SiC-TiO2 were prepared by a replication process with polyurethane sponges as the template in ceramic slurry. The electrical conductivity, dielectric and magnetic parameters of 3D reticulated ceramics (3DRCs) were measured with changes in cell size of the sponges, contents in the slurry and sintering temperature in this paper. Discussions about the influential factors of those parameters were focused on their electrical conductivity. The experimental results indicated that the electrical conductivity of 3DRCs raised with the increase of cell size, SiC/SrO·6Fe2O3 with weight ratio and sintering temperature. X-ray diffractions and SEM were used to investigate the relationship between electrical conductivity and sintering temperature. Deoxidizing reactions of SrO·6Fe2O3 caused the increasing electrical conductivity. The real part of permittivity (ε') and imaginary part of permeability (μ'') raised with the increase of electrical conductivity (σ). The imaginary part of permittivity (ε'') has a maximum at 100S/cm with the increase of sigma, and the real part of permeability (μ') changes slightly with the increase ofσ. When sigma is at the range of 10-4 S/cm to 100 S/cm (a semi conductive state), both the imagine part of permittivity and permeability raises with increasing sigma, therefore, the 3DRCs present their high electromagnetic loss properties.
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3D reticulated ceramics
,
null
,
null
,
null
Quanru ZHANG
,
Yuangao LI
,
Zheng FANG
材料科学技术（英）
The thermodynamical properties of MgCl2 in KCl-MgCl2-LiCl molten electrolytes containing MgCl2 below 0.5 (mole fraction, the same below) have been determined from the interchange energies of two binary systems KCl-MgCl2 and LiCl-MgCl2, by means of a model on the assumptions that the electrolytes in the solution are treated as independent particles instead of their ion forms and the interchange energy between the component pair KCl-LiCl is ignored when compared with those of component pairs KCl-MgCl2 and MgCl2-LiCl. The interchange energies, omega(KCl-MgCl2) and omega(MgCl2-LiCl) are obtained as -70000 and -13800 J.mol(-1), from the corresponding binary solutions, respectively.
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