Krystalová chemie a koncentrační defekty OH ve spodumenu z různých granitických pegmatitů

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F06%3A00003344" target="_blank" >RIV/61989592:15310/06:00003344 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/06:00017113

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Crystal chemistry and OH defect concentrations in spodumene from different granitic pegmatites

Popis výsledku v původním jazyce

Thirty spodumene samples of distinct paragenetic types (primary magmatic, secondary after petalite and hydrothermal) from variety of granitic pegmatites were characterized by electron microprobe, polarized FTIR spectroscopy and Mössbauer spectroscopy. The FTIR spectra of OH (weak sharp pleochroic bands at 3,425, 3,410, 3,395 cm1 and in the 3,500-3,470 spectral region) are strongly polarized with maximum absorption parallel to nc. The majority of OH dipoles are presumably generated by a partial replacement of O2 oxygen atoms with an orientation pointing above the Li vacancy site. The separation of the bands probably resulted from a replacement of the coordinating Al by Fe and Si by Al. Homogeneous spodumene mostly close to its ideal formula LiAlSi2O6 shows Fe (0.00-0.10 apfu as Fe3+; Fe3+ >> Fe2+) and Na (0.00-0.04 apfu) as the only minor cations and Fe3+Al1 substitution up to 10 mol% of the LiFe3+Si2O6 component. Hydrogen concentrations (from 0.1 up to <5 ppm H2O by weight

Název v anglickém jazyce

Crystal chemistry and OH defect concentrations in spodumene from different granitic pegmatites

Popis výsledku anglicky

Thirty spodumene samples of distinct paragenetic types (primary magmatic, secondary after petalite and hydrothermal) from variety of granitic pegmatites were characterized by electron microprobe, polarized FTIR spectroscopy and Mössbauer spectroscopy. The FTIR spectra of OH (weak sharp pleochroic bands at 3,425, 3,410, 3,395 cm1 and in the 3,500-3,470 spectral region) are strongly polarized with maximum absorption parallel to nc. The majority of OH dipoles are presumably generated by a partial replacement of O2 oxygen atoms with an orientation pointing above the Li vacancy site. The separation of the bands probably resulted from a replacement of the coordinating Al by Fe and Si by Al. Homogeneous spodumene mostly close to its ideal formula LiAlSi2O6 shows Fe (0.00-0.10 apfu as Fe3+; Fe3+ >> Fe2+) and Na (0.00-0.04 apfu) as the only minor cations and Fe3+Al1 substitution up to 10 mol% of the LiFe3+Si2O6 component. Hydrogen concentrations (from 0.1 up to <5 ppm H2O by weight

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

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2006

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

10

Číslo periodika v rámci svazku

32

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

14

Strana od-do

733-746

Kód UT WoS článku

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EID výsledku v databázi Scopus

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