Identification of Magnetic Phases in Natural Ochres by Mossbauer Spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10439552" target="_blank" >RIV/00216208:11320/20:10439552 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/20:00342529

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Q6hK4kxXeX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Q6hK4kxXeX</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12693/APhysPolA.137.667" target="_blank" >10.12693/APhysPolA.137.667</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Identification of Magnetic Phases in Natural Ochres by Mossbauer Spectroscopy

Popis výsledku v původním jazyce

The Mossbauer spectroscopy is one of the few analytical techniques that provide information on the investigated system both from the viewpoint of its structural arrangement and also magnetic order. Here, we demonstrate how 57 Fe Mossbauer spectroscopy can contribute to identification of magnetic phases in rather ordinary Fe-containing materials like natural ochres. Fe-ochre precipitates were collected at an abandoned antimony deposit in East Slovakia. Three sets of samples were studied: (i) as-collected, (ii) ochres sterilized at 95 degrees C for 30 min, and (iii) Fe-ochre precipitates which were exposed to fungal bioleaching after sterilization. The Mossbauer spectra from all three batches were recorded at 300, 80, and 5 K. Presence of magnetic phases was revealed only at the lowest temperature. At higher temperatures, all samples show significant relaxation of magnetic moments which indicates that the crystalline grains are very small and exhibit superparamagnetic behaviour.

Název v anglickém jazyce

Identification of Magnetic Phases in Natural Ochres by Mossbauer Spectroscopy

Popis výsledku anglicky

The Mossbauer spectroscopy is one of the few analytical techniques that provide information on the investigated system both from the viewpoint of its structural arrangement and also magnetic order. Here, we demonstrate how 57 Fe Mossbauer spectroscopy can contribute to identification of magnetic phases in rather ordinary Fe-containing materials like natural ochres. Fe-ochre precipitates were collected at an abandoned antimony deposit in East Slovakia. Three sets of samples were studied: (i) as-collected, (ii) ochres sterilized at 95 degrees C for 30 min, and (iii) Fe-ochre precipitates which were exposed to fungal bioleaching after sterilization. The Mossbauer spectra from all three batches were recorded at 300, 80, and 5 K. Presence of magnetic phases was revealed only at the lowest temperature. At higher temperatures, all samples show significant relaxation of magnetic moments which indicates that the crystalline grains are very small and exhibit superparamagnetic behaviour.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Acta Physica Polonica A

ISSN

0587-4246

e-ISSN

—

Svazek periodika

137

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

3

Strana od-do

667-669

Kód UT WoS článku

000558676100027

EID výsledku v databázi Scopus

2-s2.0-85090148441