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In situ XRD spectra, for Co on Ge(100), poly-Ge, and , respectively, heated at in He. For each detected phase, the corresponding stability range is indicated.
(a) In situ vs temperature for Co on Ge(100), poly-Ge, and , respectively, heated at . (b) In situ vs temperature for Co on poly-Ge for heating rates . For the respective phases, the open symbols represent and the filled symbols represent .
Kissinger plot for formation from Co on Ge(100), poly-Ge, and substrates. A compilation of 's for CoGe, , and on the respective substrates is given in Table I.
Compilation of the activation energies for germanide phase formation during solid-state reactions.
Properties of some germanide phases from the system (Refs. 11–13). is the heat of formation, is the volume of the product phase, and is the heat of reaction for the reaction in the fourth column (all per mole of the formula unit). . and denote crystalline and amorphous Ge respectively.
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