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A Neutron and X-ray Diffraction Study of the Structure of Nd Phosphate Glasses

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A Neutron and X-ray Diffraction Study of the Structure of Nd Phosphate Glasses

Uwe Hoppe, Heike Ebendorff-Heidepriem

a

, J¨org Neuefeind

b

, and Daniel T. Bowron

c Universit¨at Rostock, Fachbereich Physik, Universit¨atsplatz 3, D-18051 Rostock

aFriedrich-Schiller-Universit¨at Jena, Otto-Schott-Institut, Chemisch-Geowissenschaftliche Fakult¨at, Fraunhoferstr. 6, D-07743 Jena

bHamburger Synchrotronstrahlungslabor HASYLAB am Deutschen Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg

cISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK Reprint requests to Dr. U. H.; E-mail: hoppe@physik1.uni-rostock.de

Z. Naturforsch. 56 a, 237–243 (2001); received January 8, 2001

Diffraction experiments were performed on two (Nd2O3)x(P2O5)1 xglasses for studying the en- vironmental order of the Nd3+cations. In case of the metaphosphate glass (x= 0.25) a combination of X-ray and neutron diffraction data was used to separate the Nd-O and O-O first neighbor peaks.

An Nd-O coordination number of 6.60.3 and a mean Nd-O distance of (0.2390.001) nm were determined. In the ultraphosphate glass studied (x= 0.20) these values increase to 6.90.3 and (0.2400.001) nm where the Nd-O coordination number is equal to the number of terminal oxygen atoms (OT) which are available for coordination of each Nd3+cation. This indicates the formation of NdOnpolyhedra not sharing any O atom where also all OT’s are in Nd-OT-P positions. In the metaphosphate glass the NdOnpolyhedra have to share some OTsites.

Key words: Neutron Scattering; X-ray Scattering; Short-range Order; Phosphate Glasses.

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