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.
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页码：858 / 861
页数：4
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