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because ge had bad gas.
Ge
the energy required to break covalent bond in si is 1.1ev and in ge is 0.7ev
Si can be fabricated into ICs inexpensively, Ge cannot.Si maximum junction operating temperature is 150C, Ge is only 70C.Si is as cheap and plentiful as sand, Ge is more expensive and rarer.etc.
for germanium it is 0.3 and for silicon it is 0.7