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Nowadays, group IVa hydrides XH4 (X=C, Si, Ge, and Sn) provide an alternative way to metallic hydrogen which vas predicted to be a superconductor with high transition temperature in monatomic and molecular phases.This idea is based on the fact that hydrogen atoms probably have undertaken chemical precompression by the group IVa atoms within the unit cell.Therefore, the chemical pressure environments in group IVa hydrides may greatly reduce the physical pressure necessary for metallizing hydrogen.However,very recently experiment shows the possible decomposition of SiH4 under irradiation from x rays and lasers.