Raman Scattering and t-Phase Lattice Vibration of 3% （mole fraction） Y₂O₃-ZrO₂

Xinglun TANG and Xinhua ZHENGSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

摘 要：<正> The Raman spectra of 3% （mole fraction） Y2O3-ZrO2 （3Y） are obtained at different temperature from 77 K to 853 K. The results show that 260 cm-1 Eg and 460 cm-1 Eg modes on the spectra shift toward lower wave number with the increase of temperature; meanwhile, the continuity of the Half Width at Half Maximum （HWHM） and wave number （frequency） of Raman bands are broken and t-phase only partially transforms to m-phase at 523 K. Based on the experimental results, this paper discusses the t-phase lattice vibration of 3Y and presents the images of vibration displacement of six Raman-active modes for t-phase of ZrO2. The analysis indicates that there are diversities existing in the displacement of the atomic vibration of Raman-active modes because of their different symmetries at various temperature, which leads to the different change tendencies of Raman bands. Furthermore, the abrupt changes of some Raman-active modes indicating the atomic displacement are assumed to be the condensations of phonon modes in t

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