Journal Title
Title of Journal: Miner Petrol
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Abbravation: Mineralogy and Petrology
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Publisher
Springer Vienna
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Authors: Peter SchmidBeurmann Luisa Ottolini Frédéric Hatert Thorsten Geisler Magdalena Huyskens Volker Kahlenberg
Publish Date: 2012/12/01
Volume: 107, Issue: 4, Pages: 501-515
Abstract
The topotactic oxidation and delithiation reaction from triphylite LiFeMnPO4 leading to ferrisicklerite Li1Fe3+Mn2+PO4 was investigated under hydrothermal conditions A cuboid cut from a triphylite singlecrystal Palermo Mine New Hampshire USA with the composition Li0933Fe2+ 07336Fe3+ 00151Mn2+ 02104Mg0063210218P1002O4 in addition with ground bulk material were treated with KMnO4 and 30 H2O2aq as oxidizing agent in a 01 N hydrochloric acid solution in the temperature range between 60 and 200 °C At 120 °C a rim of 01 mm thickness of ferrisicklerite had formed around the core of unreacted triphylite The sharp reaction boundary was clearly visible due to the reddish brown absorption colors of ferrisicklerite compared to colorless triphylite Using singlecrystal Xray diffraction XRD secondary ion mass spectrometry SIMS electron probe microanalysis EPMA and 57FeMössbauer spectroscopy the product ferrisicklerite was characterized and its composition determined as Li0307Fe2+ 00491Fe3+ 0652Mn2+ 02185Mg006220981P1013O4 with unit cell parameters a = 47951 b = 99924 and c = 58862 Å EPMA investigations across the reaction boundary showed no changes in the concentrations of Fe Mn Mg and P In contrast SIMS measurements clearly proved the delithiated state of the ferrisicklerite product Polarization microscopy revealed that the orientation of the ferrisicklerite rim was the same as that of the original triphylite singlecrystal confirming the strictly topotactic character of the reaction
Keywords:
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