Struktura a vlastnosti sodno-olovnatých borofosfátových skel.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F05%3A00002865" target="_blank" >RIV/00216275:25310/05:00002865 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Structure and properties of mixed sodium-lead borophosphate glasses

Popis výsledku v původním jazyce

Mixed sodium-lead borophosphate glasses were prepared in two compositional series xNa2O-(50-x)PbO-10B2O3-40P2O5 and xNa2O-(50-x)PbO-20B2O3-30P2O5 with x = 0, 10, 20, 30, 40 and 50 mol% Na2O. Their density decreases and molar volume slightly increases with increasing Na2O content. Chemical durability steeply decreases for glasses containing 40-50 mol% Na2O, whereas glass transition temperatures reveals a minimum at the glasses with 30-40 mol% Na2O. The 31P MAS NMR and Raman spectra of the first series show that with increasing Na2O content the ratio of structural units Q2/Q1 slowly increases and the Q2 phosphate units and BO4 units prevail in the structure of these glasses. In the second series of glasses Q1 diphosphate units together with BO4 and smallnumber of BO3 units form structural network of glasses. The replacement of PbO by Na2O results in higher ionicity of bonding interactions between compensating cations and the anionic network. Lower cation field strength of Na+ ions resul

Název v anglickém jazyce

Structure and properties of mixed sodium-lead borophosphate glasses

Popis výsledku anglicky

Mixed sodium-lead borophosphate glasses were prepared in two compositional series xNa2O-(50-x)PbO-10B2O3-40P2O5 and xNa2O-(50-x)PbO-20B2O3-30P2O5 with x = 0, 10, 20, 30, 40 and 50 mol% Na2O. Their density decreases and molar volume slightly increases with increasing Na2O content. Chemical durability steeply decreases for glasses containing 40-50 mol% Na2O, whereas glass transition temperatures reveals a minimum at the glasses with 30-40 mol% Na2O. The 31P MAS NMR and Raman spectra of the first series show that with increasing Na2O content the ratio of structural units Q2/Q1 slowly increases and the Q2 phosphate units and BO4 units prevail in the structure of these glasses. In the second series of glasses Q1 diphosphate units together with BO4 and smallnumber of BO3 units form structural network of glasses. The replacement of PbO by Na2O results in higher ionicity of bonding interactions between compensating cations and the anionic network. Lower cation field strength of Na+ ions resul

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2005

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

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Svazek periodika

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Číslo periodika v rámci svazku

351

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

1039-1045

Kód UT WoS článku

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EID výsledku v databázi Scopus

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