The Long-Periodic Loop-Branched Chain Structure of the Oxonitridophosphate La

Autor: Markus, Nentwig, Simon D, Kloß, Lukas, Neudert, Lucien, Eisenburger, Wolfgang, Schnick, Oliver, Oeckler
Rok vydání: 2019
Předmět:
Zdroj: Chemistry (Weinheim an Der Bergstrasse, Germany)
ISSN: 1521-3765
Popis: The lanthanum oxonitridophosphate La21P40O46N57 was synthesized by high‐pressure metathesis from partially hydrolysed LiPN2 and LaCl3 at 750–950 °C and 7–9 GPa. The combination of transmission electron microscopy (TEM) and diffraction using microfocused synchrotron radiation revealed a monoclinic crystal structure (space group P21/n, a=14.042(4), b=7.084(3), c=41.404(10) Å, β=97.73(3)° and Z=2), which is characterized by loop‐branched 21 member single chains of P(O,N)4 tetrahedra that extend along [2 0 1]. These chains are related to the loop‐branched dreier single chains with dreier‐ring loops in stillwellite (CeBSiO5). In La21P40O46N57, these chains are characterized by a complex long‐periodic conformation and exhibit disorder that involves La/N and P split positions. This is an extraordinarily long periodicity with respect to branched single chains of tetrahedra. La21P40O46N57 constitutes the first rare‐earth oxonitridophosphate exhibiting a chain structure. Single‐crystal data are consistent with electron and powder X‐ray diffraction.
Loop the loop: The first chain‐like rare‐earth oxonitridophosphate was synthesized through partial hydrolysis and high‐pressure metathesis. La21P40O46N57 exhibits a long‐periodic loop‐branched chain structure, which was elucidated by a combination of TEM and diffraction of microfocused synchrotron radiation.
Databáze: OpenAIRE
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