Fullereny - kryształy C₆₀ czyste i domieszkowane

• Autorzy: Krystyna Żabińska

Warianty tytułu

Fullerenes - Pure and Intercalated C₆₀ Crystals

• Języki publikacji: PL

Abstrakty

Nazwa fullereny obejmuje nową klasę cząsteczek węgla, stanowiących trzecią odmianę czystego węgla poza wcześniej znanymi, tj. kryształami diamentu i grafitu. (fragment tekstu)

EN

Fullerenes represent a new type of carbon molecules whose structures are pseudospherical polyhedra. The C₆₀ molecule, named buckyball or buckminster-fullerene, is the best known one. Its shape is similar to a foot-ball. The buckyballs form crystals which can be now easily produced an studied by different methods of contemporary solid state physics. At room temperature the C₆₀ crystals have a face-centered-cubic (fcc) structure. As the temperature is lowered the phase transition at 250 K occurs. The symmetry of the crystal changes at this temperature and the low-temperature structure of the unit cell is a simple cubic (sc). Intercalation of the C₆₀ crystals with alkali metal atoms changes their electric properties. The A₃C₆₀ compounds exhibit superconductivity with a transition temperature Tc which increases with lattice constant. The highest T_c amounts to 45 K and it is lower only than temperatures measured for the complicated copper oxides. The structure of the A₃C₆₀ crystals is still the fcc one and it changes at higher dopant concentrations to a simple cubic phase (eg. A₅C₆₀,...,A₈C₆₀).(original abstract)

Słowa kluczowe

PL

Chemia

EN

Chemistry

• Czasopismo: Zeszyty Naukowe / Akademia Ekonomiczna w Krakowie
• Rocznik: 1994
• Numer: nr 436
• Strony: 13--20

Twórcy

autor

Krystyna Żabińska

• Akademia Ekonomiczna w Krakowie

Bibliografia

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