The crystal growth and characterization of the lanthanide-containing double perovskites Ln2NaIrO6 (Ln=La, Pr, Nd)

Crystal growth of La2NaTaO6: A new monoclinically distorted double perovskite

“…The Ta-O distances range from 1.979 to 2.001 Å , which is typical for a Ta 5+ cation in an octahedral environment [31]. The Na-O bond distances in La 2 NaTaO 6 , which range from 2.331 to 2.366 Å , are also in agreement with previously reported values for Na + in an octahedral environment [17].…”

“…When two different atoms, B and B 0 , are placed on the B sublattice with 1:1 ordering, the unit cell doubles to yield the A 2 BB 0 O 6 double perovskite structure. Compounds that adopt such structure possess various properties, such as proton conductivity [26], large dielectric constants [15,27], long-range magnetic order [2,17,18,20,[28][29][30], ionic conductivity [14] and photocatalytic ability [3,4,6,11,13].…”

“…Our group has developed an effective method based on hydroxide fluxes for the growth of single crystals of double perovskite oxides, Ln 2 BB 0 O 6 , where Ln is a trivalent lanthanide metal, B is a monovalent alkali metal and B 0 is a pentavalent platinum group metal [17][18][19][20]. The acid-base chemistry of molten hydroxide fluxes, best described by the Lux-Flood concept of oxoacidity [21,22], allows for the dissolution of a wide range of metal species, which is critical to their incorporation into a crystal.…”

The crystal growth and magnetic properties of Ln2LiIrO6 (Ln=La, Pr, Nd, Sm, Eu)

“…Additionally, A could represent an alkaline earth and A 0 a lanthanide cation with B being a divalent cation as exemplified by BaLaCoIrO 6 [2]. Finally, it is also possible to have A and A 0 represent a lanthanide and B an alkali metal, exemplified by the composition La 2 NaIrO 6 [3] and Ln 2 LiIrO 6 (Ln ¼ La, Pr, Nd, Sm, Eu) the title compounds of this paper.…”

“…We have recently shown that such ''wet'' melts are one route for the growth of oxide single crystals containing both lanthanide and platinum group metals [3][4][5][6].…”