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- W2000917556 abstract "The electrical conductivity of single crystals of ${mathrm{Na}}_{2}$${mathrm{SO}}_{4}$ has been measured along the three principal crystallographic axes at temperatures in the range 160--400 ifmmode^circelsetextdegreefi{}C. The measurements reveal a hitherto unsuspected large anisotropy in the ${mathrm{Na}}^{+}$ ion conduction in the stable room-temperature orthorhombic phase (V) of the as-grown crystals. The conductivity is restricted largely to the (010) crystallographic plane and is attributed to open tunnels in the [101] and [101ifmmodebarelsetextasciimacronfi{}] directions that form an interconnected network facilitating ${mathrm{Na}}^{+}$ ion diffusion. On heating, a pretransition region of sample-dependent conductivity occurs at 226 ifmmode^circelsetextdegreefi{}C followed by a sluggish but major structural transition at 241 ifmmode^circelsetextdegreefi{}C to a hexagonal phase (I). The microscopic details of this atypical irreversible transition are discussed. On cooling, further transitions to phase II (at 234 ifmmode^circelsetextdegreefi{}C) and phase III (at 229 ifmmode^circelsetextdegreefi{}C) occur, while on heating phase III transforms directly to phase I (at 249 ifmmode^circelsetextdegreefi{}C). The conductivity in phase I, II, and III is nearly isotropic and the activation energies are essentially independent of crystal orientation in each phase." @default.
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- W2000917556 date "1989-09-01" @default.
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- W2000917556 title "Ionic conductivity and the phase transitions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Na</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>SO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:…" @default.
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- W2000917556 doi "https://doi.org/10.1103/physrevb.40.4683" @default.
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