Synthesis, structure, and polymorphic transitions of praseodymium(iii) and neodymium(iii) borohydride, Pr(BH) and Nd(BH).

In this work, praseodymium(iii) borohydride, Pr(BH4)3, and an isotopically enriched analogue, Pr(11BD4)3, are prepared by a new route via a solvate complex, Pr(11BD4)3S(CH3)2. Nd(BH4)3 was synthesized using the same method and the structures, polymorphic transformations, and thermal stabilities of these compounds are investigated in detail. α-Pr(BH4)3 and α-Nd(BH4)3 are isostructural with cubic unit cells (Pa3[combining macron]) stable at room temperature (RT) and a unit cell volume per formula unit (V/Z) of 180.

Synthesis, structure and properties of bimetallic sodium rare-earth (RE) borohydrides, NaRE(BH), RE = Ce, Pr, Er or Gd.

Formation, stability and properties of new metal borohydrides within RE(BH)-NaBH, RE = Ce, Pr, Er or Gd is investigated. Three new bimetallic sodium rare-earth borohydrides, NaCe(BH), NaPr(BH) and NaEr(BH) are formed based on an addition reaction between NaBH and halide free rare-earth metal borohydrides RE(BH), RE = Ce, Pr, Er. All the new compounds crystallize in the orthorhombic crystal system.

Synthesis, structure and properties of new bimetallic sodium and potassium lanthanum borohydrides.

Two new bimetallic sodium or potassium lanthanum borohydrides, NaLa(BH) and KLa(BH), are formed using La(BH) free of metal halide by-products. NaLa(BH) crystallizes in an orthorhombic crystal system with unit cell parameters, a = 6.7987(19), b = 17.

The influence of LiH on the rehydrogenation behavior of halide free rare earth (RE) borohydrides (RE = Pr, Er).

Rare earth (RE) metal borohydrides are receiving immense consideration as possible hydrogen storage materials and solid-state Li-ion conductors. In this study, halide free Er(BH4)3 and Pr(BH4)3 have been successfully synthesized for the first time by the combination of mechanochemical milling and/or wet chemistry. Rietveld refinement of Er(BH4)3 confirmed the formation of two different Er(BH4)3 polymorphs: α-Er(BH4)3 with space group Pa3[combining macron], a = 10.