Low-energy floppy modes in high-temperature ceramics

Priya Vashishta; Rajiv K. Kalia; Ingvar Ebbsjö

doi:10.1103/PhysRevLett.75.858

Low-energy floppy modes in high-temperature ceramics

Priya Vashishta
, Rajiv K. Kalia
, Ingvar Ebbsjö

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

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. © 1995 The American Physical Society.

Original language	English
Pages (from-to)	858-861
Number of pages	4
Journal	Physical Review Letters
Volume	75
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.75.858
State	Published - Jan 1 1995
Externally published	Yes

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10.1103/PhysRevLett.75.858

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title = "Low-energy floppy modes in high-temperature ceramics",

abstract = "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. {\textcopyright} 1995 The American Physical Society.",

author = "Priya Vashishta and Kalia, \{Rajiv K.\} and Ingvar Ebbsj{\"o}",

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AU - Ebbsjö, Ingvar

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N2 - 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. © 1995 The American Physical Society.

AB - 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. © 1995 The American Physical Society.

UR - https://www.scopus.com/pages/publications/0000841642

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DO - 10.1103/PhysRevLett.75.858

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JO - Physical Review Letters

JF - Physical Review Letters

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Low-energy floppy modes in high-temperature ceramics

Abstract

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