AC CALORIMETRY OF C-60 SINGLE-CRYSTALS

被引：15

作者：

CHUNG, M

WANG, YQ

BRILL, JW

XIANG, XD

MOSTOVOY, R

HOU, JG

ZETTL, A

机构：

[1] UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720

[2] LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.45.13831

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the (effective) specific heat of single crystals of C60 using ac calorimetry. For an fcc crystal prepared by sublimation, there is a sharp hysteretic lambda-shaped anomaly at 260 K, reflecting a latent heat spread over 3 K, similar to what is observed in powders using differential scanning calorimetry. There is also a discontinuity of 11.6R in the specific heat. For orthorhombic crystals prepared by slow evaporation from a toluene-hexane solution, a nonhysteretic, apparently second-order, transition is observed at 239 K. There is a peak in the specific heat consistent with a transition entropy of R ln12.

引用

页码：13831 / 13833

页数：3

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