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Polyhydrides of alkali metals under high pressures have been attracting great interests owing to the predicted pressure‐stabilized untraditional stoichiometries and potential superconductivity. We have performed Raman scattering measurements of lithium polyhydrides synthesized under high pressure and high temperature conditions up to 182 GPa. Between 30 and 180 GPa, four phases appear, and they are...
In this study, we attempted to prepare films of Si clathrates (Na8Si46 (Type I) and Nax Si136(Type II)) and NaSi by using Si single crystalline substrates as the Si source. NaSi, which is the precursor of the Si clathrate, was successfully generated as a highly orientated film on the Si substrate, by exposing Na vapor under Ar atmosphere. The NaSi film was then transformed into Si clathrate film of...
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