Dineodymium magnesium titanate(IV). A Rietveld refinement of neutron powder diffraction data

A Structural Study of the Perovskite Series CaTi1−2xFexNbxO3

“…Solid symbols are tilt angles derived directly form the unit-cell parameters (19,20), empty symbols are angles calculated form the unit-cell parameters and mean B-O distances (21). resolution between the component peaks, indicating greater structural distortion compared to CaTiO (Table 4).…”

The Magnetotransport Properties and a Neutron Diffraction Study of Sr2–xNdxFeMoO6 Double Perovskites

“…[14] In all cases, the monoclinic beta angle is very close to 90°, thus indicating a strong pseudo-orthorhombic character of the unit cell. This symmetry and space group are known to be adopted by other related and well-known double perovskites as Nd 2 MgTiO 6 , [15] Ca 2 FeMoO 6 , [17] with small tolerance factors. The observed reduction in symmetry of the adopted space group is mainly due to subtle tilts of the BO 6 octahedra, which result in small shifts of the oxygen positions and which can be detected by neutron diffraction.…”

A Structural and Magnetic Study of the Series of Double Perovskites Ca2Fe1+xW1–xO6

“…In fact, the monoclinic beta angle is very close to 90°in all cases (see Table 2), thereby indicating a strong pseudo-orthorhombic character of the unit cell. Several examples of monoclinically distorted 1:1 ordered perovskites, for example Nd 2 MgTiO 6 , [20] Ca 2 -CaUO 6 , [21] Sr 2 MnWO 6 , Ca 2 MnWO 6 and Sr 2 MnMoO 6 , [22] have been described in the past. All these compounds crystallize in the space group P2 1 /n, with a ≈ b ≈ √2a 0 and c ≈ 2a 0 , and show long-range ordering of the two different cations placed at the B positions of the A 2 BЈBЈЈO 6 perovskite structure.…”