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Since Sr0.6Ba0.4Nb2O6 (SBN) is ferroelectric with a tungsten–bronze structure, numerous needlelike ferroelectric domains appear in a SBN single crystal when it is cooled through its transition temperature in the absence of a poling field. If the domains were illuminated by 1.06 μm radiation from a Nd:YAG laser, second-harmonic diffuse light was generated from these domains. This interesting effect, which can clearly be seen with the naked eye, will be used to generate all the primary colors using suitable lasers.

Thermoelectric properties of CoP 3 and CeFe 4 P 12 have been measured. These compounds were synthesized by a flux technique using Sn as the solvent. The samples were characterized by x-ray diffractometry and electron microprobe analyses. The Seebeck coefficient, the electrical resistivity, the Hall effect, and the thermal conductivity were measured over a wide range of temperatures. The results indicate that CoP 3 and CeFe 4 P 12 are semiconductors, in agreement with theoretical predictions. The thermal conductivity of CeFe 4 P 12 is about 10 times larger than that for CeFe 4 Sb 12 which is primarily due to both reduced motion of the Ce ions in smaller voids and lower holephonon scattering. The results are analyzed and discussed to provide guidelines for optimization of the thermoelectric properties of these materials.

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