Phase transitions in Na2AC60 (A=Cs, Rb, and K) fullerides

Katsumi Tanigaki, I. Hirosawa, T. Manako, J. S. Tsai, J. Mizuki, T. W. Ebbesen

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29 Citations (Scopus)


The ternary system fullerides Na2AC60 (A=Cs, Rb, and K) are studied by differential scanning calorimetry in the temperature range of 100 to 450 K. All show reproducible phase transitions at the transition temperatures of 299 K (H=2.50.5 J/g) for Na2CsC60, 313 K (H=2.70.5 J/g) for Na2RbC60, and 305 K (H=3.10.5 J/g) for Na2KC60. Orientational ordering of the fullerene unit is responsible for the observed phase transitions (Tsc-fcc) from a high-temperature face-centered-cubic (fcc) to a low-temperature simple-cubic (sc) phase. The observed Tsc-fcc and enthalpy can be compared to those for pristine C60 which has Tsc-fcc=256.5 K (H=80.5 J/g). The observed behavior is discussed in terms of the balance between the C603 - C603- intermolecular interaction and the C603 - A+ Coulombic interaction as a function of lattice parameter.

Original languageEnglish
Pages (from-to)12307-12310
Number of pages4
JournalPhysical Review B
Issue number17
Publication statusPublished - 1994 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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