A superlattice-like structure (SLL) incorporating two nonpromising phase change materials was applied to phase change random access memory (PCRAM) cell. A properly designed SLL structure could balance both the phase change speed and stability of a PCRAM. Moreover, SLL PCRAM cells exhibited lower programming current and fast working time of 5ns. The main reason for the excellent performances is due to the much lower thermal conductivity of the SLL material compared to that of bulk materials. The thermal conductivity of eight SLL layers cycle was found to be smaller than 30% of that of single layer material.

The title compound, C12H6CI 4, 2,2',5,5'-tetrachlorobiphenyl, crystallized in the monoclinic space group C21c. The dihedral angle and bond length between the two phenyl tings are 59.0 ° and 1.467 (14),A,, respectively. The ortho-and meta-C--C1 bond lengths, C(6)mCI (2) and C(3)--C1(1), are 1.746 (8) and 1.746 (9) A, respectively.

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An initialization-free method of producing blue-laser rewritable optical discs is proposed. After designing the disc, finding a suitable additional layer material and optimizing the film thickness of each layer, the initialization-free Blu-ray Disc was successfully fabricated. No obvious deterioration of writing/erasing properties was observed in the initialization-free Blu-ray Disc compared with a conventional Blu-ray Disc. Moreover, the initialization-free Blu-ray Disc is more suitable for high-speed recording.