Thermal, structural and crystallization study of Na2O–P2O5–Nb2O5 glasses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F22%3A39919186" target="_blank" >RIV/00216275:25310/22:39919186 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022459622006703?pes=vor" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022459622006703?pes=vor</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jssc.2022.123545" target="_blank" >10.1016/j.jssc.2022.123545</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal, structural and crystallization study of Na2O–P2O5–Nb2O5 glasses

Popis výsledku v původním jazyce

The present investigation deals with the study of the structure, properties and thermal behaviour ofNa2O–P2O5–Nb2O5 glasses prepared in the compositional series 40Na2O-(60-x)P2O5-xNb2O5 (x=0-40 mol%Nb2O5). The modification of starting 40Na2O–60P2O5 glass by Nb2O5 revealed changes both in the structure andproperties. The glass density steeply increases with increasing Nb2O5 content while the molar volume decreases.Parent sodium ultraphosphate glass was covered with a thin layer of partially hydrolysed glass in air. Thechemical durability of Nb2O5 containing glasses was high. The replacement of P2O5 by Nb2O5 resulted in agradual increase in the refraction index as well as in an increase in glass transition temperature and dilatometricsoftening temperature. DSC measurements demonstrated that glasses crystallize under heating in the temperaturerange of 330–880C. The lowest thermal stability was found for the glass containing 40 mol% Nb2O5. The Ramanand NMR spectra indicated that the structure of 40Na2O–60P2O5 glass is formed mainly by Q2 and Q1 phosphateunits interconnected by P–O–P bonds. The replacement of P2O5 by Nb2O5 leads to depolymerization and thepartial transformation of Q2 units into Q1 units and finally to isolated Q0 units. Nb2O5 forms in the glass structureNbO6 octahedra.

Název v anglickém jazyce

Thermal, structural and crystallization study of Na2O–P2O5–Nb2O5 glasses

Popis výsledku anglicky

The present investigation deals with the study of the structure, properties and thermal behaviour ofNa2O–P2O5–Nb2O5 glasses prepared in the compositional series 40Na2O-(60-x)P2O5-xNb2O5 (x=0-40 mol%Nb2O5). The modification of starting 40Na2O–60P2O5 glass by Nb2O5 revealed changes both in the structure andproperties. The glass density steeply increases with increasing Nb2O5 content while the molar volume decreases.Parent sodium ultraphosphate glass was covered with a thin layer of partially hydrolysed glass in air. Thechemical durability of Nb2O5 containing glasses was high. The replacement of P2O5 by Nb2O5 resulted in agradual increase in the refraction index as well as in an increase in glass transition temperature and dilatometricsoftening temperature. DSC measurements demonstrated that glasses crystallize under heating in the temperaturerange of 330–880C. The lowest thermal stability was found for the glass containing 40 mol% Nb2O5. The Ramanand NMR spectra indicated that the structure of 40Na2O–60P2O5 glass is formed mainly by Q2 and Q1 phosphateunits interconnected by P–O–P bonds. The replacement of P2O5 by Nb2O5 leads to depolymerization and thepartial transformation of Q2 units into Q1 units and finally to isolated Q0 units. Nb2O5 forms in the glass structureNbO6 octahedra.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

C - Předmět řešení projektu podléhá obchodnímu tajemství (§ 504 Občanského zákoníku), ale název projektu, cíle projektu a u ukončeného nebo zastaveného projektu zhodnocení výsledku řešení projektu (údaje P03, P04, P15, P19, P29, PN8) dodané do CEP, jsou upraveny tak, aby byly zveřejnitelné.

Název periodika

Journal of Solid State Chemistry

ISSN

0022-4596

e-ISSN

1095-726X

Svazek periodika

316

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

123545

Kód UT WoS článku

000889470300004

EID výsledku v databázi Scopus

2-s2.0-85138048397