The layer structured zirconium phosphate(Zr P) can be intercalated with atoms, molecules, small organic groups and even polymers. The structures and properties of the Zr P intercalation compounds can be deliberately tuned, leading to promising potential applications in many fields. This article provides a brief review on the experimental results of the Zr P intercalation compounds, with the focus on the polymer/a-zirconium phosphate (α-Zr P) nano-composites. The computer simulations of the Zr P intercalation compounds at the atomic level play a significant role in designing and understanding the properties of Zr P, and in the promotion of the applications of compounds.
New materials have become one of the most important and fastest-growing industries all over the world.Important progress in materials science and technology has produced profound influences on the national economy,daily life and national defense of our country.In this paper,we review the state of the art of materials science and technology in China,with emphasis on recent research focuses and advanced technology.
ZrB_(2)-SiBCN ceramics with ZrO_(2) additive are hot-pressed under a constant applied pressure.The densification behavior of the composites is studied in a view of creep deformation by means of the Bernard-Granger and Guizard model.With determination of the stress exponent(n)and the apparent activation energy(Q_(d)),the specific deformation mechanisms controlling densification are supposed.Within lower temperature ranges of 1300-1400℃,the operative mechanism is considered to be grain boundary sliding accommodated by atom diffusion of the polymer-derived SiBCN(n=1,Q_(d)=123±5 kJ/mol)and by viscous flow of the amorphous SiBCN(n=2,Qd=249±5 kJ/mol).At higher temperatures,the controlling mechanism transforms to lattice or intra-granular diffusion creep(n=3-5)due to gradual consumption of the amorphous phase.It is suggested that diffusion of oxygen ions inside ZrO_(2) into the amorphous SiBCN decreases the viscosity,modifies the fluidity,and contributes to the grain boundary mobility.
