0000000000204961
AUTHOR
Philipp Gollé-leidreiter
Crystal structure determination of a new LaPO4 phase in a multicomponent glass ceramic via 3D electron diffraction
Abstract A glass ceramic from the MgO–Al2O3–SiO2 system containing additives of ZrO2, TiO2, La2O3 and P2O5 was investigated. Via x-ray powder diffraction (XRPD) and Transmission electron microscopy(TEM) the crystalline phases present could be identified as MgAl2O4 (Spinel), orthorhombic ZrTiO4 and a polymorph of LaPO4 with a previously unknown crystal structure. The crystal structure of this LaPO4 phase was solved ab initio via 3D ED Data. The polymorph occurs in a distorted barite structure type in the same space group (P21/n) as the stable monazite type polymorph, however the density is higher and the La has a higher coordination number. Furthermore the LaPO4 is present in a spinodal reli…
Exomorphism of jacobsite precipitates in bixbyite single crystals from the Thomas Range in Utah
Abstract Naturally occurring single crystals of bixbyite, (Fe,Mn)2O3, from the Thomas Mountain Range in Utah, U.S.A., were studied via (scanning) transmission electron microscopy (S)TEM. With up to 5 cm edge length, these mineral specimens are the largest bixbyite crystals found worldwide. Their hexahedral shapes are often modified by {211} facets at the corners and small {211} truncations along their cube edges. Characteristic lamellar defects, running parallel to the {100} planes, can be observed via TEM imaging. The defects are, according to EDS analyses, attributed to the tetragonal manganese silicate braunite, Mn7[SiO12]. In the present study, electron nano-diffraction and atomic resol…
Frontispiece: A Novel High‐Pressure Tin Oxynitride Sn 2 N 2 O
Chemistry - a European journal 26(10), 2187-2194 (2020). doi:10.1002/chem.202081063
A Novel High‐Pressure Tin Oxynitride Sn 2 N 2 O
Chemistry - a European journal in Press(in Press), chem.201904529 (2019). doi:10.1002/chem.201904529