Publikace detail

Structure and properties of potassium niobato-borophosphate glasses.

Autoři: Koudelka Ladislav | Pospíšil Jaroslav | Mošner Petr | Montagne Lionel | Delevoye Laurent

Rok: 2008

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Non-Crystalline Solids

Název nakladatele: Elsevier Science BV

Místo vydání: Amsterdam

Strana od-do: 129-133

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Struktura a vlastnosti niobáto-borofosfátových skel.	Práce se zabývá studiem stuktury skel kompoziční řady (1-x)[0.5K2O-0.1B2O3-0.4P2O5]-xNb2O5 (x = 0-45.7 mol% Nb2O5) připravených pomalým chladnutím skelné taveniny na vzduchu. Struktura skel byla studována pomocí Ramanovy, 31P a 11B MAS NMR spektroskopie.
eng	Structure and properties of potassium niobato-borophosphate glasses.	Bulk glasses of the series (1-x)[0.5K2O-0.1B2O3-0.4P2O5]-xNb2O5 with x = 0-45.7 mol% Nb2O5 were prepared by slow cooling in air and investigated by Raman, 31P, and 11B MAS NMR spectroscopy. The incorporation of Nb2O5 into the parent borophosphate glass results in a substantial increase in the glass transition temperature and chemical durability of glasses. Raman spectra showed that Nb atoms form distorted NbO6 octahedra, which are isolated at low Nb2O5 content, whereas at higher Nb2O5 content they form clusters. 11B NMR spectra of the glasses revealed the interaction between Nb2O5 and BO4 tetrahedral units, which results in a partial transformation of tetrahedral BO4 units to trigonal BO3 units and the formation of mixed B(OP)4-n(ONb)n units.	Raman spectroscopy; Phosphates; NMR, MAS-NMR and NQR; Short-range order

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