The Long-Periodic Loop-Branched Chain Structure of the Oxonitridophosphate La 21 P 40 O 46 N 57 , Elucidated by a Combination of TEM and Microfocused Synchrotron Radiation
The lanthanum oxonitridophosphate La P O N was synthesized by high-pressure metathesis from partially hydrolysed LiPN and LaCl 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 s...
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Veröffentlicht in: | Chemistry : a European journal 2019-11, Vol.25 (63), p.14382-14387 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The lanthanum oxonitridophosphate La
P
O
N
was synthesized by high-pressure metathesis from partially hydrolysed LiPN
and LaCl
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 P2
/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)
tetrahedra that extend along [2 0 1]. These chains are related to the loop-branched dreier single chains with dreier-ring loops in stillwellite (CeBSiO
). In La
P
O
N
, 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. La
P
O
N
constitutes the first rare-earth oxonitridophosphate exhibiting a chain structure. Single-crystal data are consistent with electron and powder X-ray diffraction. |
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ISSN: | 0947-6539 1521-3765 |
DOI: | 10.1002/chem.201902873 |