Large enhancement of boron carbides’ seebeck coefficients through vibrational softening

T. L. Aselage, D. Emin, S. S. McCready, R. V. Duncan

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

We report measurements of the Seebeck coefficients of boron carbides having compositions B12+xC−x, 0.15 <x < 1.7, from 6 to 900 K. These Seebeck coefficients are large, ≈200 μV/K at 300K, despite boron carbides having high carrier densities, ≈ 1021cm−3. The Seebeck coefficients also have unusual temperature dependencies and depend only weakly on carrier density. These exceptional properties can arise from boron carbides’ bipolaronic holes substantially softening the vibrational modes with which they interact.

Original languageEnglish
Pages (from-to)2316-2319
Number of pages4
JournalPhysical Review Letters
Volume81
Issue number11
DOIs
StatePublished - Sep 14 1998

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