LOW-ENERGY FLOPPY MODES IN HIGH-TEMPERATURE CERAMICS

被引：50
|
作者：
VASHISHTA, P
KALIA, RK
EBBSJO, I
机构：
[1] LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70803
[2] UNIV UPPSALA,STUDSVIK NEUTRON RES LAB,S-61182 NYKOPING,SWEDEN
来源：
PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 05期
关键词：
D O I：
10.1103/PhysRevLett.75.858
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Enhancement of the phonon density of states due to low-energy floppy modes in crystalline and glassy states of the high-temperature ceramic Si3N4 is investigated using the molecular-dynamics method. Floppy modes appear continuously in the glass as the connectivity of the system is reduced. In the crystal, they appear suddenly at 20% volume expansion. The density of states due to the floppy modes varies linearly with energy, and the specific heat is significantly enhanced by the floppy modes.
引用
收藏
页码：858 / 861
页数：4
相关论文
共 50 条
  • [31] HIGH-TEMPERATURE FAILURE MECHANISMS IN CERAMICS
    EVANS, AG
    JOURNAL OF METALS, 1981, 33 (09): : A1 - A2
  • [32] High-temperature reliability of advanced ceramics
    Ohji, T
    JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME, 2001, 123 (01): : 64 - 69
  • [33] PIEZOELECTRIC CERAMICS FOR HIGH-TEMPERATURE TRANSDUCERS
    KORZUNOVA, L
    FERROELECTRICS, 1992, 134 (1-4) : 175 - 180
  • [34] SUBSTITUTION OF CERAMICS FOR HIGH-TEMPERATURE ALLOYS
    PROBST, HB
    AMERICAN CERAMIC SOCIETY BULLETIN, 1980, 59 (02): : 206 - 210
  • [35] ELECTRONIC CERAMICS IN HIGH-TEMPERATURE ENVIRONMENTS
    SEARCY, AW
    AMERICAN CERAMIC SOCIETY BULLETIN, 1980, 59 (08): : 830 - 830
  • [36] HIGH-TEMPERATURE DEFORMATION MECHANISM IN CERAMICS
    BLUMENTHAL, W
    EVANS, AG
    PORTER, JR
    AMERICAN CERAMIC SOCIETY BULLETIN, 1980, 59 (03): : 360 - 360
  • [37] HIGH-TEMPERATURE STABILITY IN STRUCTURAL CERAMICS
    WILKINSON, DS
    CIM BULLETIN, 1988, 81 (914): : 77 - 77
  • [38] CORROSION OF CERAMICS AND METALS AT HIGH-TEMPERATURE
    ELLIOTT, JF
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1976, : 36 - 36
  • [39] ELECTRONIC CERAMICS IN HIGH-TEMPERATURE ENVIRONMENTS
    SEARCY, AW
    MESCHI, DJ
    JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1982, 65 (04) : 216 - 218
  • [40] HIGH-TEMPERATURE TORSION TESTING OF CERAMICS
    SPICAK, K
    SILIKATY, 1971, 15 (03): : 253 - &
12345