Synthesis and Conductivities of Sulfate/Selenate Phases Related to Nasicon: NaxM′(II)xM″(III)2-x(SO4)3-y(SeO4)y
✍ Scribed by P.R. Slater; C. Greaves
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 232 KB
- Volume
- 107
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The synthesis of (\mathrm{Na}) containing (\mathrm{Nasicon-type} \mathrm{phases} \mathrm{of} \mathrm{the} \mathrm{form} \mathrm{Na}{x} M^{\prime}(\mathrm{II}){x} M^{\prime \prime}\left(\mathrm{III}{2-r}\left(\mathrm{SO}{4}\right){3-r}\left(\mathrm{SeO}{4}\right){x}\right.) (\left(M^{\prime}=\mathrm{Mg}, \mathrm{Zn}, \mathrm{Cd}, \mathrm{Mn} ; M^{\prime \prime}=\mathrm{Al}, \mathrm{Cr}, \mathrm{Fe}, \mathrm{In}, \mathrm{Yb} ; 0 \leq x \leq 1.75 ; 0 \leq y \leq 3\right)) is reported. The conductivities of a range of samples have been measured, with the highest value observed at (200^{\circ} \mathrm{C}) being (2 \times 10^{-4} \Omega^{-1} \mathrm{~cm}^{-1}) for (\mathrm{Na}{1.75} \mathrm{Mg}{1.55} \mathrm{Cr}{1.25}\left(\mathrm{SO}{4}\right){3}). The range of (x) for which single phase samples are observed depends on the nature of (M^{\prime}) and (M^{\prime \prime}), and on the value of (y). Attempts to increase the (\mathrm{Na}) content, and so increase the conductivity, by partially substituting the ((\mathrm{S}, \mathrm{Se}) \mathrm{O}{4}) groups by (\mathrm{PO}{4}) or (\mathrm{SiO}_{4}) have proved unsuccessful. (1993 Academic Press. Inc.