Investigation of nanoceramics based on aluminum and zirconium oxides using the h

2019-11-18 18:39:46

temperature diffusion dependence coefficient phonon

责任者: Barabanenkov, Yu.N.;Ivanov, V.V.;Ivanov, S.N.;Taranov, A.V.;Khazanov, E.N. 单位: Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, Russia 来源出处: Journal of Experimental and Theoretical Physics(J. Exp. Theor. Phys. (Russia)),2001/03/,92(3):474-9 摘要: The processes of phonon transport in ceramics and composites based an aluminum and zirconium oxides are studied experimentally in the region of helium temperatures. It is demonstrated that, for the ceramic grain size R within two orders of magnitude and more (up to nanosizes), the phonon diffusion coefficient Deff∝R and exhibits a decreasing temperature dependence. In aluminum-based nanoceramics with R<200 nm, the phonon diffusion coefficient decreases abruptly by two orders of magnitude, and it exhibits an increasing temperature dependence. A model of temperature dependence of the diffusion coefficient is suggested 关键词: alumina;ceramics;diffusion;grain size;nanostructured materials;phonons;powder technology;zirconium compounds;nanoceramics;heat pulse method;phonon transport;ceramic grain size;phonon diffusion coefficient;temperature dependence;aluminum-based nanoceramics;diffusion coefficient temperature dependence model;2 to 4 K;200 nm;ZrO2-Al2O3;Al2O3