Publikace detail

Medium range order in lead borophosphate glasses

Autoři: Koudelka Ladislav | Mošner Petr | Jirák Josef | Zeyer-Düsterer Michaela | Jäger Christian

Rok: 2006

Druh publikace: článek v odborném periodiku

Název zdroje: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B

Název nakladatele: Society of Glass Technology

Místo vydání: Sheffield

Strana od-do: 471-475

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Uspořádání středního dosahu v olovnatých borofosforečnanových sklech	Byla studována struktura borofosfátových skel systému 50PbO-xB2O3(50-x)P2O5 (x = 0-25 mol% B2O3) pomocí 11B MQMAS NMR a Ramanovy spektroskopie.
eng	Medium range order in lead borophosphate glasses	The structure of 50PbO-xB2O3(50-x)P2O5 glasses with x = 0-25 mol% B2O3 was refined by Raman and 11B MQMAS NMR investigations. The analysis of Raman spectra, using the concentration step of 2 mol% B2O3 within the range of 0-12 mol% B2O3, showed that the evolution of changes in the type of oxygen bridges can be observed from the Raman bands within the range of 600-800 cm-1. 11B MQMAS NMR spectra of glasses with x = 15, 20 and 25 mol% B2O3 revealed the presence of two BO4 sites in these glasses. The first site B1O4, characterized by the chemical shift of d = -3.8 ? (-3.4) ppm, was assigned to tetrahedral B(OP)4 structural units. Within the concentration range x = 15-25 mol% B2O3 the site B1O4 is gradually replaced by the site B2O4 with the chemical shift of d = -1.8 ? (-1.1) ppm. This second site we assigned to the presence of B(OP)3(OB) units in which the central boron atom is linked to three PO4 groups and one BO3 group.	MQMAS NMR spectra;borophosphate;glasses

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