Grain-size limit of polycrystalline materials

Through combining an experimental investigation on the isothermal nanocryst allization thermodynamics of bulk amorphous selenium and a theoretical anal ysis, an easy and reliable way to derive the lower grain-size limit of poly crystalline materials was proposed. The grain-size limit for the polycrysta lline selenium was determined to be about 4.0 nm. [S0163-1829(99)00310-0].