Synthesis, Characterization, and Electrical Properties of the Series of Oxides Ag5Pb2−xCuxO6 (0.0≤x≤0.5)

Oxalate coprecipitation synthesis and transport properties of polycrystalline Sr1−La PbO3− solid solutions

“…Resistive superconducting-like anomalies for the temperature range 190 K < T < 270 K in Cu 24 Pb 2 Sr 2 Ag 2 O x were subsequently observed by another group [11]. Although there are no unambiguous confirmations of high-temperature superconductivity occurring in the above-mentioned silver-copper-lead and silver-lead oxides, the search is being continued [12,13].…”

Electronic band structure and Fermi surface ofAg5Pb2O6

“…It has been reported that doping of Bi or Cu substituted for the Pb site tends to make the system insulating while In doping shows only a moderate increase in the resistivity. [21,22] A naive interpretation for the insulating state can be made for a composition with one valence electron more or less than that in Ag 5 Pb 2 O 6 , such as Ag 5 PbBiO 6 and Ag 5 PbInO 6 , since the conduction band of Ag 5 Pb 2 O 6 is half filled. However, there are no energy gaps below or above the half-filled conduction band as shown in Figs.…”

“…These results of the doping effects are quite consistent with the resistivity data. [21,22] It is, furthermore, necessary to elucidate insulating nature in a Cu-doped system.…”

New Negative Temperature Coefficient Ceramics in Ca–Ce–Nb–M–O (M=Mo or W) System

“…C omplex oxides have yielded numerous materials of interest to solid‐state chemists, condensed matter physicists, and materials scientists. They exhibit interesting transport properties such as superconductivity, 1 metallic conductivity, 2 semiconductivity, 3 magnetism, etc. Semiconducting oxides are a very important group of materials; their applications span through photocatalysts, 4 negative temperature coefficient (NTC) thermistors, 5 gas sensors, 6 etc.…”