THERMODYNAMIC MODEL OF CaO-SiO2 GLASSES

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F20%3A39916405" target="_blank" >RIV/00216275:25310/20:39916405 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22310/20:43921660

Result on the web

<a href="https://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1301" target="_blank" >https://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.13168/cs.2019.0049" target="_blank" >10.13168/cs.2019.0049</a>

Result language

angličtina

Original language name

THERMODYNAMIC MODEL OF CaO-SiO2 GLASSES

Original language description

The CaO-SiO2 glass forming system is a typical example of a situation when the Shakhmatkin and Vedishcheva thermodynamic model cannot explain the experimentally determined Q-units distribution. As the system components are determined as stable crystalline phases found in the equilibrium phase diagram, the reason of the model failure is the missing system component representing the Q(3) structural unit. We suggested a solution to the problem by adding an artificial CaO center dot 2SiO(2) component and we proposed a method of estimating the Gibbs energy of this component. The method is based on the linear relationship found between the reaction Gibbs energy of the formation of the system components representing the different Qn units (n = 3, 2, 1, 0) divided by the number of non-bridging oxygen atoms in this particular component (i.e., 4-n) on one side and the n value on the other side. The method was qualified by the good coincidence of the model results with the MAS NMR experimentally determined Q-distribution. Moreover, the estimated value of Gibbs energy practically coincides with the optimised value obtained by minimising the sum of the squares of the d eviations between the experimental and calculated Q-distribution with respect to the molar Gibbs energy of CaO center dot 2SiO(2).

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Ceramics-Silikaty

ISSN

0862-5468

e-ISSN

—

Volume of the periodical

64

Issue of the periodical within the volume

1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

5

Pages from-to

63-67

UT code for WoS article

000508638600007

EID of the result in the Scopus database

2-s2.0-85082077222