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STUDY ON THE STRUCTURE, ELECTRICAL PROPERTIES AND CONDUCTION MECHANISM 0F THE MULTICRYSTAL MULTIPHASE MATERIAL Li_2MO_2-xWxO_6
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作者 崔万秋 沈志其 周德保 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1990年第2期15-21,共7页
The conductivity of non-crystalline fast ionic conductor for B_2O_3-Li_2O-LiCl-Al_2O_3 system is studiedin this paper. The glass structure of this system is discussed by means of infrared spectrum and X-ray fluorescen... The conductivity of non-crystalline fast ionic conductor for B_2O_3-Li_2O-LiCl-Al_2O_3 system is studiedin this paper. The glass structure of this system is discussed by means of infrared spectrum and X-ray fluorescence analysis, and the effects of LiCl and A1_2O_3 on the conductivity of Li^+ in the system are studied as well. Adding Li_2O to the system gives rise to transfer from [BO_3] triangular units to [BO_4] tetrahedral. When Li_2O content exceeds 30mol%, the main group of the glass is the diborate group with more [BO_4] tetrahedra. The adding of LiCl has no obvious influence on the glass structure, and LiCl is under a state dissociated by network, but with the increase of LiCl, the increase of conductivity is obvious. By adding A1_2O_3, the glass can be formed when the room-temperature is cooling down,the conductivity decreases while the conductive activatory energy increases for the glass. The experiment shows that conductivity in the room-temperature is σ= 6.2×10^(-6)Ω^(-1)cm^(-1), when at 300℃, the σ=6.8×10^(-3)Ω^(-1)cm^(-1). The conductive activatory energy computed is 0.6~1.0eV. 展开更多
关键词 MO MO LI OC STUDY ON THE STRUCTURE ELECTRICAL PROPERTIES AND CONDUCTION MECHANISM 0F THE MULTICRYSTAL multiphase material Li2MO2-xWxO6 ESR
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Preparation and Characterization of Al_(8.31)Si_(1.91)Mg_(3.78)O_(20)/Al_(4.8)Si_(1.2)O_(9.6)/Mg_(2.0)Al_(4.02)Si_(4.98)O_(18) Multiphase Material
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作者 罗金荣 阮玉忠 +1 位作者 林寿 陈捷 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2013年第3期369-374,共6页
A two-step sintering method was used to prepare Al8.31Si1.91Mg3.78O20 (corundum solid solution)/Al4.8Si1.2O9.6 (mullite solid solution)/Mg2.0Al4.02Si4.98O18 (cordierite solid solution) multiphase material, for t... A two-step sintering method was used to prepare Al8.31Si1.91Mg3.78O20 (corundum solid solution)/Al4.8Si1.2O9.6 (mullite solid solution)/Mg2.0Al4.02Si4.98O18 (cordierite solid solution) multiphase material, for the purposes of making these three crystal structures have point defects which could help the particles diffuse and transfer at high temperature, accelerate the sintering efficiently and enhance the material strength as well as the bulk density. The impacts of different formulas on the structure and properties of the multiphase material were investigated. With XRD and SEM analyses, for each sample, the crystal structure and microstructure were characterized, the crystalline phase content and cell parameters were determined with Rietveld Quantification software, and the properties were tested. The comparative optimal formula determined was calcinated chamotte of 80wt% and calcinated sludge of 20wt%; and its corresponding bending strength and retention rate of bending strength after a thermal shock were 29.74 MPa and 80.15%, respectively. 展开更多
关键词 corundum solid solution mullite solid solution cordierite solid solution multiphase material formula
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Numerical evaluation of overestimation of the interface thickness around ellipsoidal particle
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作者 Wenxiang Xu Huisu Chen Wen Chen 《Theoretical & Applied Mechanics Letters》 CAS 2013年第5期39-41,共3页
Abstract When interfacial layers are viewed as a separate phase, the interface thickness plays an essential role in assessing physico-mechanical properties of particulate materials. However, the interface thickness fr... Abstract When interfacial layers are viewed as a separate phase, the interface thickness plays an essential role in assessing physico-mechanical properties of particulate materials. However, the interface thickness from sectional analysis is often overestimated, due to the irregularity of surface textures of grains in opaque materials that gives rise to the normal of a cross-sectional plane non-perpendicular to the surface of grains. Hence, the determination of the overestimation degree is very critical to precisely obtain the interface thickness. This article develops a numerical model for the overestimation degree of the interface thickness around an ellipsoidal grain with an arbitrary aspect ratio, by applying an accurate sectional analysis algorithm, and quantitative stereology and geometrical probability theories. Furthermore, on the basis of the developed numerical model, the influence of ellipsoidal particle shape on the overestimation degree is quantitatively charac-terized. 展开更多
关键词 multiphase materials interface thickness ellipsoidal particle OVERESTIMATION MODEL
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A general framework for modeling long-term behavior of earth and concrete dams
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作者 Bernhard A.SCHREFLER Francesco PESAVENTO +3 位作者 Lorenzo SANAVIA Giuseppe SCIUME Stefano SECCHI Luciano SIMONI 《Frontiers of Structural and Civil Engineering》 SCIE EI 2011年第1期41-52,共12页
Many problems are linked with the long-term behavior of both earthdams and concrete dams.They range from hydraulic fracturing to alkali-silica reaction(ASR)and to repair work in concrete dams,from seismic behavior to ... Many problems are linked with the long-term behavior of both earthdams and concrete dams.They range from hydraulic fracturing to alkali-silica reaction(ASR)and to repair work in concrete dams,from seismic behavior to secondary consolidation in earthdams.A common framework for the simulation of such systems is shown,based on the mechanics of multiphase porous media.The general model is particularized to specific situations and several examples are shown. 展开更多
关键词 earth dams concrete dams multiphase porous materials coupled problems hydraulic fracture concrete hydration alkali-silica reaction(ASR) finite element method
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