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Sodium ionic conduction in complex hydrides with [BH4] and [NH2] anions
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10.1063/1.4716021
/content/aip/journal/apl/100/20/10.1063/1.4716021
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/20/10.1063/1.4716021

Figures

Image of FIG. 1.
FIG. 1.

Schematic phase diagram of the Na(BH4)–Na(NH2)–NaI system investigated in this study.

Image of FIG. 2.
FIG. 2.

XRD profiles and crystal structures of (a), (b) (1 – x)Na(BH4)+xNaI, (c), (d) (1 – y)Na(NH2)+yNaI, and (e), (f) (1 – z)Na(BH4)+zNa(NH2). Open circles, crosses, and triangles denote Na(BH4)1– x I x solid solution phase, Na(NH4)0.5I0.5, and Na(BH4)0.5(NH2)0.5, respectively. In Na(BH4)0.5(NH2)0.5, Na occupies two thirds of the available positions in a disordered manner.

Image of FIG. 3.
FIG. 3.

Electrical properties of Na(BH4)0.75I0.25, Na(NH4)0.5I0.5, and Na(BH4)0.5(NH2)0.5. (a) A typical impedance plots obtained using a pair of sodium or molybdenum electrodes for Na(NH2)0.5I0.5 measured at 333, 343, and 353 K. (b) Temperature dependences of the electrical conductivity measured during heating. For reference, the data of the host materials Na(BH4), Na(NH2), and NaI are also shown.

Image of FIG. 4.
FIG. 4.

Time dependence of dc conductivity of Na(BH4)0.5(NH2)0.5 after applying a constant voltage of 0.1 V with sodium (nonblocking) or molybdenum (blocking) electrodes at 333 K.

Image of FIG. 5.
FIG. 5.

Cyclic voltammograms of Na(BH4)0.5(NH2)0.5 sandwiched between the sodium and molybdenum electrodes taken at 333 K with a voltage scan rate of 1 mV/s over three cycles.

Tables

Generic image for table
Table I.

Information about crystal structures of the Na(BH4)–Na(NH2)–NaI system. For reference, the data of the host materials Na(BH4), Na(NH2), and NaI are also shown.

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2012-05-14
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sodium ionic conduction in complex hydrides with [BH4]− and [NH2]− anions
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/20/10.1063/1.4716021
10.1063/1.4716021
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