Possible phonon density of states of high-temperature phase structure of the negative thermal expansion compound ZrW2O8

被引：3
作者：
Yamamura, Yasuhisa [1 ]
Saito, Kazuya [1 ]
机构：
[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Dept Chem, Tsukuba, Ibaraki 3058571, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2007年 / 76卷 / 12期
关键词：
negative thermal expansion; heat capacity; ZrW2O8;
D O I：
10.1143/JPSJ.76.123603
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
To study the phonon properties of beta-ZrW2O8 showing the negative thermal expansion (NTE), the heat capacities of Zr1-xMxW2O8-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 beta-ZrW2O8, showing a rounded form around 5 meV. The rounded phonon DOS of beta-ZrW2O8 is in marked contrast to that of the low-temperature phase of ZrW2O8, and their distinction is consistent with the difference in NTE nature between two structures.
引用
收藏
页数：4
相关论文
共 25 条
  • [1] Negative thermal expansion and oxygen disorder in cubic ZrMo2O8 -: art. no. 134101
    Allen, S
    Evans, JSO
    [J]. PHYSICAL REVIEW B, 2003, 68 (13):
  • [2] Boerio-Goates J, 2002, J THERM ANAL CALORIM, V69, P773, DOI 10.1023/A:1020639502445
  • [3] Frustrated soft modes and negative thermal expansion in ZrW2O8 -: art. no. 215902
    Cao, D
    Bridges, F
    Kowach, GR
    Ramirez, AP
    [J]. PHYSICAL REVIEW LETTERS, 2002, 89 (21)
  • [4] Direct evidence for a low-frequency phonon mode mechanism in the negative thermal expansion compound ZrW2O8
    David, WIF
    Evans, JSO
    Sleight, AW
    [J]. EUROPHYSICS LETTERS, 1999, 46 (05): : 661 - 666
  • [5] Phonon density of states and negative thermal expansion in ZrW2O8
    Ernst, G
    Broholm, C
    Kowach, GR
    Ramirez, AP
    [J]. NATURE, 1998, 396 (6707) : 147 - 149
  • [6] Structural investigation of the negative-thermal-expansion material ZrW2O8
    Evans, JSO
    David, WIF
    Sleight, AW
    [J]. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1999, 55 : 333 - 340
  • [7] Negative thermal expansion in ZrW2O8 and HfW2O8
    Evans, JSO
    Mary, TA
    Vogt, T
    Subramanian, MA
    Sleight, AW
    [J]. CHEMISTRY OF MATERIALS, 1996, 8 (12) : 2809 - 2823
  • [8] Unusual low-energy phonon dynamics in the negative thermal expansion compound ZrW2O8 -: art. no. 225501
    Hancock, JN
    Turpen, C
    Schlesinger, Z
    Kowach, GR
    Ramirez, AP
    [J]. PHYSICAL REVIEW LETTERS, 2004, 93 (22)
  • [9] Negative thermal expansion from 0.3 to 1050 Kelvin in ZrW2O8
    Mary, TA
    Evans, JSO
    Vogt, T
    Sleight, AW
    [J]. SCIENCE, 1996, 272 (5258) : 90 - 92
  • [10] Phonon density of states and thermodynamic properties in cubic and orthorhombic phases of ZrW2O8
    Mittal, R
    Chaplot, SL
    [J]. SOLID STATE COMMUNICATIONS, 2000, 115 (06) : 319 - 322
123