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概要
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For the solidstate engineers utilizing single crystals for elecronic and opto-electronic devices, an ultimate goal is to design crystal structures with which they could realize properties pertinent to the device performances. Present article summarizes several approaches so far made as mile-stones to the above goal.; The first is an approach via “figure of merit”, and an example is given for the case of acoustooptic medium for the ultrasonic light-beam deflection devices. The second is with “ionic substitution method”, and progresses in rare-earth garnet thin film design for magnetic-bubble memory device are examined. The third approach concerns with the selection of the one among the several structures built with the identical building unit. A brief account is given for “oxygen-octahedral ferroelectric crystals” applicable as electro-optic, nonlinear optic and electro-mechanical devices. The last approach is to have a kind of prescription of the structure. As a successful example, crystal structures of neodimium and alkali-metal-neodimium ultra-phosphates are reviewed.
- 日本結晶学会の論文