Investigation of the oxidation process in GeTe-based phase change alloy using Ge K-edge XANES spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F19%3A39914841" target="_blank" >RIV/00216275:25310/19:39914841 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.degruyter.com/view/j/pac.2019.91.issue-11/pac-2018-1229/pac-2018-1229.xml" target="_blank" >https://www.degruyter.com/view/j/pac.2019.91.issue-11/pac-2018-1229/pac-2018-1229.xml</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/pac-2018-1229" target="_blank" >10.1515/pac-2018-1229</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Investigation of the oxidation process in GeTe-based phase change alloy using Ge K-edge XANES spectroscopy

Popis výsledku v původním jazyce

In this work, we clearly demonstrate the efficacy of using XANES spectroscopy in conjunction with a Pilatus detector as a sensitive tool to allow the study of the oxidation process in GeTe alloys via depth profile analysis. On the basis of Ge K-edge XANES spectra, it was found that GeTe alloys do not oxidize readily after an initial native surface oxidation that occurs upon exposure to oxygen in the air at the elevated temperatures, 100 degrees C and 330 degrees C. We demonstrate that amorphous GeTe possesses a higher predisposition to oxidation than crystalline GeTe when exposed to the air at temperature of 100 degrees C. When the temperature is set to 330 degrees C in an air ambient, we show that the amorphous to crystal phase transition affects the oxidation process more significantly than the simple annealing of crystalline GeTe. We suggest that the higher tendency of GeTe films to oxidize during the phase transition is a consequence of the breaking of Ge-Ge bonds in the presence of oxygen atoms which subsequently leads to the extra formation of Ge-O bonds during crystallization.

Název v anglickém jazyce

Investigation of the oxidation process in GeTe-based phase change alloy using Ge K-edge XANES spectroscopy

Popis výsledku anglicky

In this work, we clearly demonstrate the efficacy of using XANES spectroscopy in conjunction with a Pilatus detector as a sensitive tool to allow the study of the oxidation process in GeTe alloys via depth profile analysis. On the basis of Ge K-edge XANES spectra, it was found that GeTe alloys do not oxidize readily after an initial native surface oxidation that occurs upon exposure to oxygen in the air at the elevated temperatures, 100 degrees C and 330 degrees C. We demonstrate that amorphous GeTe possesses a higher predisposition to oxidation than crystalline GeTe when exposed to the air at temperature of 100 degrees C. When the temperature is set to 330 degrees C in an air ambient, we show that the amorphous to crystal phase transition affects the oxidation process more significantly than the simple annealing of crystalline GeTe. We suggest that the higher tendency of GeTe films to oxidize during the phase transition is a consequence of the breaking of Ge-Ge bonds in the presence of oxygen atoms which subsequently leads to the extra formation of Ge-O bonds during crystallization.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Pure and Applied Chemistry

ISSN

0033-4545

e-ISSN

1365-3075

Svazek periodika

91

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

7

Strana od-do

1769-1775

Kód UT WoS článku

000496795300007

EID výsledku v databázi Scopus

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