Crystals of CdF₂:In and CdF₂:Ga reduced in a cadmium vapor exhibit unusual
metastable properties that can be explained by a "negative U" model. This work
uses NMR to investigate this model for CdF₂:Ga and CdF₂:Ga,Y and compare the
results to optical measurements. Temperature dependent relaxation measurements
were done on ¹¹³Cd...
Bulk properties of CuSc₁₋ₓMgₓO₂, CuSc₁₋ₓMgₓO₂₊y, BaCu₂S₂, Bai₁₋ₓKCu₂S₂, BaCu₂Se₂
and Bai₁₋ₓKₓCu₂Se₂ are investigated supporting the search for highly conductive p-type
thin films. Mg is an efficient dopant in CuScO₂ with conductivity up to l.5.10⁻² S/cm.
Oxidation of CuScO₂:Mg leads to further increase in conductivity up to 0.5 S/cm. The
amount of...
New transparent p- and n-type semiconductors and luminescent materials have been prepared and characterized. Synthesis, structures, optical and electrical properties of new chalcogenide fluoride p-type transparent semiconductors MCuQF (M=Ba, Sr; Q=S, Se, Te) are described. Band-gap tuning and improvement in conductivity through p-type doping are demonstrated in the family. The...
In this study, pulsed NMR is used to probe the hyperfine
interactions in liquid Se₀₅Te₀₅ doped with 3% Ga over the
temperature range from 500 °C to 900 °C. Both resonance shifts and
relaxation times are determined for ⁷⁷Se, ⁷¹Ga and ⁶⁹Ga.
NMR on both Ga-isotopes allows one to measure...