Refinement of the crystal structure of Pr₇O₁₂ by powder neutron diffraction

The role of the coordination defect: A new structural description of four fluorite-related sesquioxide minerals, bixbyite (Mn2O3), braunite (Mn7SiO12), braunite II (CaMn14SiO24), parwelite (Mn10Sb2As2Si2O24), and their structural relationships

“…The first detailed structures for the various members of the praseodymium (and terbium) oxide series were proposed by Von Dreele et al [15][16][17][18][19] on the basis of exploring all possible model structures by Rietveld analysis of powder neutron diffraction data -if the experimental data fitted those calculated for a model, it was assumed to be the correct structure.…”

Structure of new metastable cubic TbO2−x

“…The fact that every stable superstructure in these materials must contain an integral number of vacancies led to the formulation of the general R n O 2n−2m formula which describes compositions of known phases with n = (m = ) 7 (1), 9 (1), 11 (1), 12 (1), 16 (1), 19 (2), 24 (2), 29 (3), 39 (4), 40 (4), 48 (4), 62 (6) and 88 (8) [1]. Structural features of RO 2−x were investigated using electron diffraction techniques, only structures and compositions of Ce 7 O 12 [3], Pr 7 O 12 [4], Pr 9 O 16 [5], Pr 10 [8] were verified through neutron powder diffraction.…”

Electrochemical single crystal growth of Tb24O44 microparticles

“…All known RO 2−x phases (R = Ce, Pr, and Tb) are summarized in Table 1. Among them, only seven structures of Ce 7 O 12 [4], Pr 7 O 12 [5], Pr 9 O 16 [6], Pr 40 O 72 [7], Pr 24 O 44 [8], Tb 7 O 12 and Tb 11 O 20 [9] have been identified by neutron powder diffraction analyses. Other members in the series have been identified only by high-resolution transmission electron microscopic observations.…”