کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1613374 | 1005597 | 2013 | 4 صفحه PDF | دانلود رایگان |

Sodium and magnesium ionic conduction in complex hydrides as a new category of solid-state fast ionic conductors is presented. We first investigated experimentally the sodium ionic conductivities of the representative Na-based complex hydrides NaBH4, NaNH2, NaAlH4, and Na3AlH6, all of which have single complex anion [BH4]−, [NH2]−, [AlH4]− and [AlH6]3−, respectively. Na3AlH6 showed much higher ionic conductivity of 5 × 10−7 S/cm at 300 K than NaBH4, NaNH2, and NaAlH4 (their ionic conductivities were around 10−10 S/cm). We obtained the sodium fast-ionic conductor Na2(BH4)(NH2) with the [BH4]− and [NH2]− complex anions by combining NaBH4 and NaNH2 with a molar ratio of 1:1. It exhibited the most superior sodium ionic conductivity of 3 × 10−6 S/cm at 300 K because of the specific antiperovskite-type structure with vacancies in the Na+ site. Furthermore, first-principles molecular dynamics simulations suggested the possible magnesium ionic conduction in the high-temperature phase of Mg(BH4)2 by substituting partly [BH4]− with [AlH4]−.
• We investigate experimentally sodium ionic conduction in complex hydrides.
• Sodium fast-ionic conductor Na2(BH4)(NH2) is obtained by combining NaBH4 and NaNH2.
• We simulate possible magnesium ionic conduction in Mg(BH4)2.
Journal: Journal of Alloys and Compounds - Volume 580, Supplement 1, 15 December 2013, Pages S98–S101