Full text loading...
Schematic phase diagram of the Na(BH4)–Na(NH2)–NaI system investigated in this study.
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.
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.
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.
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.
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.
Article metrics loading...