Optical and crystal-chemical changes in aquamarines and yellow beryls from Thanh Hoa province, Vietnam induced by heat treatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F15%3A33157035" target="_blank" >RIV/61989592:15310/15:33157035 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/15:00087129

Výsledek na webu

<a href="http://link.springer.com/article/10.1007%2Fs00269-014-0719-4" target="_blank" >http://link.springer.com/article/10.1007%2Fs00269-014-0719-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00269-014-0719-4" target="_blank" >10.1007/s00269-014-0719-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optical and crystal-chemical changes in aquamarines and yellow beryls from Thanh Hoa province, Vietnam induced by heat treatment

Popis výsledku v původním jazyce

Optical and crystal-chemical changes in two beryl varieties after the heat treatment were determined using a wide spectrum of analytical methods. Studied aquamarines are generally more enriched in Fe (up to 0.25 apfu) and alkali (up to 0.08 apfu) than yellow beryls (up to 0.07 apfu Fe, up to 0.04 apfu alkali). The determined c/a ratio of 0.997-0.998 classified all our studied beryls as "normal" beryls. While no crystal structure changes were observed in samples heated to 700 A degrees C, those heated to900 and 1,100 A degrees C exhibited cracks and fissures. Reduced Fe occurred in samples heated between 300 and 700 A degrees C, and subsequent oxidation from 900 to 1,100 A degrees C induced changes in their colour and clarity. The Fe-bearing beryl colour is controlled by the position of the absorption edge and the presence of a broad band attributed to Fe2+ in the NIR region. Blue colour results from the absorption edge located deeper in the UV region and the presence of broad band in

Název v anglickém jazyce

Optical and crystal-chemical changes in aquamarines and yellow beryls from Thanh Hoa province, Vietnam induced by heat treatment

Popis výsledku anglicky

Optical and crystal-chemical changes in two beryl varieties after the heat treatment were determined using a wide spectrum of analytical methods. Studied aquamarines are generally more enriched in Fe (up to 0.25 apfu) and alkali (up to 0.08 apfu) than yellow beryls (up to 0.07 apfu Fe, up to 0.04 apfu alkali). The determined c/a ratio of 0.997-0.998 classified all our studied beryls as "normal" beryls. While no crystal structure changes were observed in samples heated to 700 A degrees C, those heated to900 and 1,100 A degrees C exhibited cracks and fissures. Reduced Fe occurred in samples heated between 300 and 700 A degrees C, and subsequent oxidation from 900 to 1,100 A degrees C induced changes in their colour and clarity. The Fe-bearing beryl colour is controlled by the position of the absorption edge and the presence of a broad band attributed to Fe2+ in the NIR region. Blue colour results from the absorption edge located deeper in the UV region and the presence of broad band in

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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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

2015

Kód důvěrnosti údajů

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

Název periodika

Physics and Chemistry of Minerals

ISSN

0342-1791

e-ISSN

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Svazek periodika

42

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

16

Strana od-do

287-302

Kód UT WoS článku

000351463100004

EID výsledku v databázi Scopus

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