Thermophysical and Electrical Properties of a Natural Zeolite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F23%3A00373857" target="_blank" >RIV/68407700:21110/23:00373857 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1063/5.0146731" target="_blank" >https://doi.org/10.1063/5.0146731</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0146731" target="_blank" >10.1063/5.0146731</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermophysical and Electrical Properties of a Natural Zeolite

Popis výsledku v původním jazyce

Thermophysical processes occurring during the firing of zeolite (mined in Nizny Hrabovec, Slovakia) was studied in terms of conventional thermal analyses (differential thermal analysis, thermogravimetry, dilatometry), acoustic emission, scanning electron microscopy, and DC conductivity measurements. The evaporation of the water molecules trapped in the cavities and channels of zeolite led to a continuous gradual decrease in the samples mass up to ~850 °C. Clinoptilolite (the major mineral phase of zeolite) transformed into an amorphous phase above 800 °C. The sintering process started at 900 °C in the presence of liquid phase. DC conductivity revealed that the dominant charge carriers, mostly due to the dehydration of zeolite, are H+ and OH– ions up to the collapse of its structure. At higher temperatures alkali ions Na+, K+, and Ca2+ became the major charge carriers with conduction activation energy of 3.51 eV (from 830 °C to 930 °C). Above 960 °C the appearance of glassy phase supported the DC conductivity carried by the alkali ions and the activation energy reached 1.67 eV.

Název v anglickém jazyce

Thermophysical and Electrical Properties of a Natural Zeolite

Popis výsledku anglicky

Thermophysical processes occurring during the firing of zeolite (mined in Nizny Hrabovec, Slovakia) was studied in terms of conventional thermal analyses (differential thermal analysis, thermogravimetry, dilatometry), acoustic emission, scanning electron microscopy, and DC conductivity measurements. The evaporation of the water molecules trapped in the cavities and channels of zeolite led to a continuous gradual decrease in the samples mass up to ~850 °C. Clinoptilolite (the major mineral phase of zeolite) transformed into an amorphous phase above 800 °C. The sintering process started at 900 °C in the presence of liquid phase. DC conductivity revealed that the dominant charge carriers, mostly due to the dehydration of zeolite, are H+ and OH– ions up to the collapse of its structure. At higher temperatures alkali ions Na+, K+, and Ca2+ became the major charge carriers with conduction activation energy of 3.51 eV (from 830 °C to 930 °C). Above 960 °C the appearance of glassy phase supported the DC conductivity carried by the alkali ions and the activation energy reached 1.67 eV.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

Central European Symposium on Thermophysics 2022 (CEST 2022)

ISBN

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ISSN

1551-7616

e-ISSN

1551-7616

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

AIP Conference Proceedings

Místo vydání

New York

Místo konání akce

Olomouc

Datum konání akce

31. 8. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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