J. Phys. Soc. Jpn. 76, 123603 (2007) [4 Pages]
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Received September 18, 2007; Accepted October 30, 2007; Published December 10, 2007
To study the phonon properties of β-ZrW 2 O 8 showing the negative thermal expansion (NTE), the heat capacities of Zr 1- x M x W 2 O 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 2 O 8 , showing a rounded form around 5 meV. The rounded phonon DOS of β-ZrW 2 O 8 is in marked contrast to that of the low-temperature phase of ZrW 2 O 8 , and their distinction is consistent with the difference in NTE nature between two structures.
©2007 The Physical Society of Japan
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