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- W2169595810 abstract "The temperature dependences of resistivity and thermopower measurements reveal that nanocrystals of silicates in lead-silicate glass of various compositions undergo structural transitions in the temperature range of 800 â 1000 K. The diameter of these nanocrystals estimated from Scherrerâs formula is about 0.8 â 1.6 nm and each nanocrystal consists of 8 - 64 unit cells. Structure transitions are detected as sharply maxima of resistivity Ï and thermopower S at temperature T = 800 â 100 K. Lead-silicate glass was doped by RuO<SUB>2</SUB> up to 16 weight% to facilitate the measurements of the Ï and the S. The doped lead-silicate glass has a metal-like behavior at the room temperature: the temperature dependences Ï(T) and S(T) are very slow, the value of the S is typical for metals (few and tens of μV/K). Beyond the maximum of the resistance (temperature T > 1000 K) doped lead-silicate glass turns into typical semiconductor having energy gap about 0.05 â 1.5 eV depending on the composition of the glass. Anomalous thermal expansion of the RuO<SUB>2</SUB> relict crystals is detected at the temperatures of 800 â 1000 K as well." @default.
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- W2169595810 date "2012-02-01" @default.
- W2169595810 modified "2023-10-18" @default.
- W2169595810 title "Structural Transitions of Silicate Nanocrystals in the Glass" @default.
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- W2169595810 doi "https://doi.org/10.5923/j.materials.20120201.07" @default.
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