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Structural Integration of Tellurium Oxide into Mixed‐Network‐Former Glasses: Connectivity Distribution in the System NaPO 3 –TeO 2
Author(s) -
Rinke Matthias T.,
Zhang Long,
Eckert Hellmut
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700358
Subject(s) - metaphosphate , x ray photoelectron spectroscopy , oxide , chemistry , tellurium , spectroscopy , mixed oxide , analytical chemistry (journal) , crystallography , inorganic chemistry , nuclear magnetic resonance , phosphate , physics , organic chemistry , quantum mechanics
Sodium phosphate tellurite glasses in the system (NaPO 3 ) x (TeO 2 ) 1− x were prepared and structurally characterized by thermal analysis, vibrational spectroscopy, X‐ray photoelectron spectroscopy (XPS) and a variety of complementary solid‐state nuclear magnetic resonance (NMR) techniques. Unlike the situation in other mixed‐network‐former glasses, the interaction between the two network formers tellurium oxide and phosphorus oxide produces no new structural units, and no sharing of the network modifier Na 2 O takes place. The glass structure can be regarded as a network of interlinked metaphosphate‐type P (2) tetrahedral and TeO 4/2 antiprismatic units. The combined interpretation of the O 1s XPS data and the 31 P solid‐state NMR spectra presents clear quantitative evidence for a nonstatistical connectivity distribution. Rather, the formation of homoatomic POP and TeOTe linkages is favored over mixed POTe connectivities. As a consequence of this chemical segregation effect, the spatial sodium distribution is not random, as also indicated by a detailed analysis of 31 P/ 23 Na rotational echo double‐resonance (REDOR) experiments .