A copper-deficient tetragonal phase derived from chalcopyrite CuGaS2.

Direct synthesis of CuGaS(2) from elemental ingredients in a two-zone furnace resulted in a macroseparation of Cu-rich and Ga-rich regions over the crystallization volume. In the Cu-rich parts of the ingot, a near-stoichiometric CuGaS(2) chalcopyrite phase (I42d) and copper sulfides were found. In the Ga-rich part, along with a chalcopyrite phase with some Cu deficiency, a new tetragonal phase I4m2 with composition close to Cu(5)Ga(9)S(16) and the crystal lattice parameters a = 3.

AgGaSe2 thin films grown by chemical close-spaced vapor transport for photovoltaic applications: structural, compositional and optical properties.

Thin films of chalcopyrite AgGaSe(2) have been successfully grown on glass and glass/molybdenum substrates using the technique of chemical close-spaced vapor transport. The high crystallinity of the samples is confirmed by grazing-incidence x-ray diffraction, scanning and transmission electron microscopy, and optical transmission/reflection spectroscopy. Here, two of the three expected direct optical bandgaps are found at 1.

Prediction of independent functioning and behavior problems in geriatric patients.

Folstein's Mini Mental State Exam, a test assessing the capacity to perform novel and/or repetitive motor tasks (Behavioral Dyscontrol Scale) and a brief measure of working memory were used in a sample of 50 male Veterans Affairs geriatric clinic patients who ranged in age from 63 to 105 (mean, 80.1). The purpose of this study was to attempt to predict the patients' capacity to regulate their behavior independently.