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Title: Octahedral oxide glass network in ambient pressure neodymium titanate

Journal Article · · Scientific Reports

Abstract Rare-earth titanates form very fragile liquids that can be made into glasses with useful optical properties. We investigate the atomic structure of 83TiO 2 -17Nd 2 O 3 glass using pair distribution function (PDF) analysis of X-ray and neutron diffraction with double isotope substitutions for both Ti and Nd. Six total structure factors are analyzed (5 neutron + 1 X-ray) to obtain complementary sensitivities to O and Ti/Nd scattering, and an empirical potential structure refinement (EPSR) provides a structural model consistent with the experimental measurements. Glass density is estimated as 4.72(13) g cm −3 , consistent with direct measurements. The EPSR model indicates nearest neighbor interactions for Ti-O at $$$$\overline{r}_{TiO}$$$$ r ¯ TiO  = 1.984(11) Å with coordination of $$$$n_{TiO}$$$$ n TiO  = 5.72(6) and for Nd-O at $$$$\overline{r}_{NdO}$$$$ r ¯ NdO  = 2.598(22) Å with coordination of $$$$n_{NdO}$$$$ n NdO  = 7.70(26), in reasonable agreement with neutron first order difference functions for Ti and Nd. The titanate glass network comprises a mixture of distorted Ti-O 5 and Ti-O 6 polyhedra connected via 71% corner-sharing and 23% edge-sharing. The O-Ti coordination environments include 15% nonbridging O-Ti 1 , 51% bridging O-Ti 2 , and 32% tricluster O-Ti 3 . This structure is highly unusual for oxide glasses melt-quenched at ambient pressure, as it consists of Ti-O x predominantly in octahedral (with nearly no tetrahedral) coordination.

Research Organization:
Materials Development, Inc., Evanston, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
Grant/Contract Number:
SC0018601; AC02-06CH11357; 80NSSC19K1288; ECCS-2025633; DMR-1720139
OSTI ID:
1868384
Alternate ID(s):
OSTI ID: 1904380
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 12 Journal Issue: 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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