Possible Phonon Density of States of High-Temperature Phase Structure of the Negative Thermal Expansion Compound ZrW_2O_8(Condensed matter: structure and mechanical and thermal properties)

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概要

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• To study the phonon properties of β-ZrW_2O_8 showing the negative thermal expansion (NTE), the heat capacities of Zr_<1-x>M_xW_2O_<8-y> (M = Sc, Lu; x = 0.02, 0.04) at low temperatures were measured and analyzed. The analysis presents the effective phonon density of states (DOS) of β-ZrW_2O_8, showing a rounded form around 5meV. The rounded phonon DOS of β-ZrW_2O_8 is in marked contrast to that of the low-temperature phase of ZrW_2O_8, and their distinction is consistent with the difference in NTE nature between two structures.

• 2007-12-15

著者

• SAITO Kazuya

  Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba

• YAMAMURA Yasuhisa

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• Saito Kazuya

  Department Of Chemistry Graduate School Of Pure And Applied Sciences University Of Tsukuba

• Yamamura Yasuhisa

  Department Of Chemistry Graduate School Of Pure And Applied Sciences University Of Tsukuba

• Saito Kazuya

  Department Of Aeronautics And Astronautics Graduate School Kyoto University

• Yamamura Yasuhisa

  Department Of Chemistry Faculty Of Pure And Applied Sciences University Of Tsukuba

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