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- W2037355884 abstract "Electrical conductivity is reported for the 10 – 500 K range in microcrystalline La-doped SrTiO3 samples. These had been reduced by equilibration at 1325 K in a low oxygen partial pressure (PO2 from 10−16 to 10−20 atm), and quenched. The data support a Sr vacancy defect model, whereby excess oxygen compensates La donors when equilibration is for PO2 > 10−18 atm prior to quenching. Stronger reduction prior to quenching leads to Ti site controlled valency conduction. The fall-off of conductivity upon cooling below 300 K does not fit an Arrhenius form for any of the quenched samples, indicating a combination of carrier density and carrier mobility considerations. The conductivity for 300 K, and also for much lower temperatures, shows a strong maximum near [La] ⋍ 0.2% atomic, or some 3 × 1019 cm−3. It is expected that low-mobility behavior for stronger doping results from merging of conduction and impurity bands. Thermpower data also suggests impurity banding." @default.
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- W2037355884 date "1982-02-01" @default.
- W2037355884 modified "2023-10-13" @default.
- W2037355884 title "Electronic conduction in quenched ceramic samples of highly reduced lanthanum doped SrTiO3" @default.
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- W2037355884 doi "https://doi.org/10.1016/0025-5408(82)90146-5" @default.
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