Simultaneous length and lattice parameter change measurements are performed on tetragonal tin single crystals in a- and c-direction from room temperature to melting temperature. Length and lattice parameter change measurements agree within experimental error for all temperatures. From this it can be concluded that the maximum vacancy concentration is less than 3 × 10−5, which is the maximum experimental uncertainty. Using the energy of formation E = 0.50 eV from other experiments an upper limit for the entropy of formation of s/k = 1.1 is calculated.
An Zinn-Einkristallen werden gleichzeitig Langen- und Gitterkonstantenanderungsmessungen in a- und c-Richtung von Zimmertemperatur bis zur Schmelztemperatur durchgefuhrt. Langen- und Gitterkonstantenanderungen stimmen fur alle Temperaturen innerhalb der experimentellen Fehlergrenzen uberein. Daraus folgt eine maximale Leerstellenkonzentration von 3 × 10−5, entsprechend der maximalen experimentellen Ungenauigkeit. Mit der Bildungsenergie E = 0,50 eV aus anderen Experimenten kann ein maximaler Wert fur die Bildungsentropie von s/k = 1,1 angegeben werden.
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