Measurements of lattice parameters and compositions for In1−xGaxAsyP1−y lattice matched to InP demonstrate the validity of Vegard’s law for this quaternary. The measured compositional dependence of the band gap shows a bowing parameter smaller than predicted from the previously measured band gaps of the four constituent ternaries.

A comparison between magnetic and reflection loss characteristics of substituted strontium ferrite and nanocomposites of ferrite/carbon nanotubes J. Appl. Phys. 111, 07B543 (2012) Experimental study and theoretical prediction of dielectric permittivity in BaTiO3/polyimide nanocomposite films Appl. Phys. Lett. 100, 092903 (2012) High temperature x ray diffraction determination of the body-centered-cubic-face-centered-cubic transformation temperature in (Fe70Ni30)88Zr7B4Cu1 nanocomposites

Accurate lattice parameter, hydrostatic density and Curie temperature measurements have been made on lithium tantalate single crystals grown from different melt compositions. Crystal compositions were determined by comparing crystal Curie temperatures with those determined from well-reacted ceramic specimens of known composition. These measurements showed that a stoichiometric melt produces nonstoichiometric crystals and that the congruently melting composition is 49.0 mole % Li20. The resulting defect model for nonstoichiometric lithium tantalate is Litt-ts-n)xlTatt+x)nxe-03 where n--2 and the existence region is 46.0 to 50.4 mole % Li20 at room temperature.

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