α- and β-Na2[BH4][NH2]: Two modifications of a complex hydride in the system NaNH2–NaBH4; syntheses, crystal structures, thermal analyses, mass and vibrational spectra

Thermal decomposition kinetics of light-weight composite NaNH2–NaBH4 hydrogen storage materials for fuel cells

“…So far, there are a few researches focusing on composite NaNH 2 eNaBH 4 systems. Chater et al [13] and Somer et al [14] synthesized composite NaNH 2 eNaBH 4 systems by annealing the raw materials in sealed quartz tube or glass ampoule, while we achieved similar NaNH 2 eNaBH 4 systems via ball milling [15]. All these studies indicate the composite NaNH 2 eNaBH 4 is promising for developing new hydrogen storage materials.…”

Structure and properties of complex hydride perovskite materials

“…Metal borohydrides have large structural flexibility and display a range of other properties such as fast-ion conduction 2,3 or permanent nano-porosity 4 . An Na-conducting borohydride-amide has been reported as an anti-perovskite type complex hydride 5 . Until now, metal borohydrides have been obtained by synthesis approaches that are hard to control and the often rather complex new materials have little potential for structural engineering and optimization of useful properties.…”

Na3[BN2] and Na2K[BN2]: A Known and a Novel Alkali Metal Dinitridoborate Obtained via Mild Thermal Dehydrogenation

“…[6] The high temperature α-form is accessible via single heating of the reactants NaNH 2 the melting point of 496 K. Above 573 K, the compound undergoes a sudden dehydrogenation reaction which is accomplished at around 690 K. The composition of the solid residues after the thermal process varies with the molar ratio of the starting binaries NaNH 2 and NaBH 4 . While Na 2 BNH 6 (1:1) is decomposing into a mixture of NaH, Na, and an unidentified dark amorphous solid, blends with Ն 2:1 yielded only Na 3 BN 2 . The formation of bulk Na 3 BN 2 in the present case is due to the "mild" thermal conditions of the dehydrogenation process, taking place when NaNH 2 and NaBH 4 (molar ratio Ն 2:1) react in the melt.…”

“…The thermal behavior of the NaNH 2 :NaBH 4 mixtures (molar ratio between 1:1 and 2:1) has recently been reported. [6] The studies proved that for blends with molar ratio 2:1, the ultimate product of the dehydrogenation process at 873 K is Na 3 [BN 2 ]. The present study is focused mainly on the range of the thermal stability and the products of the thermal decomposition of this compound.…”