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- W2073582488 abstract "This paper describes a cause of the time-dependent degradation of conductivity observed in the representative BIMEVOX phases Bi2Cu0.1V0.9O5.35 (BICUVOX.10) and Bi2Co0.1V0.9O5.35 (BICOVOX.10). In both phases, to date, the following facts were reported: the high-temperature stable γ-type phase transformed reversibly to the low-temperature stable γ′-type phase at 450–500°C through the order–disorder transition without changing to the β-type or α-type phase. In addition, the degradation of conductivity was observed in γ′-BICUVOX.10 at about 420°C. In the present study, it has turned out that a prolonged annealing at 450°C for several hundred hours causes both γ′ phases to change to a new phase with α-Bi4V2O11-related structure. This α-related phase changes promptly to the γ phase on heating (at about 535°C for BICOVOX.10 and at about 485°C for BICUVOX.10); by contrast, the γ′ phase reverts sluggishly to the α-related phase. Since the α-related phase shows far lower conductivity (10−4.8S cm−1 at 430°C for BICUVOX.10), this gradual γ′-to-α transition explains well the time-dependent degradation of conductivity in the γ′ phase reported so far. Namely, the γ′ phase is metastably quenched to room temperature and reverts gradually to the α-related phase upon heat treatment below the α-to-γ transition temperature." @default.
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- W2073582488 date "2002-01-01" @default.
- W2073582488 modified "2023-10-13" @default.
- W2073582488 title "Time-Dependent Degradation Due to the Gradual Phase Change in BICUVOX and BICOVOX Oxide-Ion Conductors at Temperatures below about 500°C" @default.
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- W2073582488 doi "https://doi.org/10.1006/jssc.2001.9396" @default.
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