Typomorphism of mineral parageneses of native bismuth in rocks and deposits of Central Asia

Dunin-Barkovskaya, E.A.; Yusupov, R. G.

doi:10.1080/00206817609471205

Cited by 2 publications

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“…Of the many possible rare earth congeners constituting the agardite group, only agardite-(Y) and agardite-(La) are recognized as distinct species by the IMA. 1 Others have been reported in the literature [2][3][4][5][6][7] but their species status remains unresolved. It should be noted that formulae given above refer to ideal, end-member compositions; extensive solid solution in the A site and involving P for As is known for naturally occurring material.…”

Section: Introductionmentioning

confidence: 99%

Use of Infrared Spectroscopy for the Determination of Electronegativity of Rare Earth Elements

et al. 2004

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Infrared spectroscopy has been used to study a series of synthetic agardite minerals. Four OH stretching bands are observed at around 3568, 3482, 3362, and 3296 cm(-1). The first band is assigned to zeolitic, non-hydrogen-bonded water. The band at 3296 cm(-1) is assigned to strongly hydrogen-bonded water with an H bond distance of 2.72 A. The water in agardites is better described as structured water and not as zeolitic water. Two bands at around 999 and 975 cm(-1) are assigned to OH deformation modes. Two sets of AsO symmetric stretching vibrations were found and assigned to the vibrational modes of AsO(4) and HAsO(4) units. Linear relationships between positions of infrared bands associated with bonding to the OH units and the electronegativity of the rare earth elements were derived, with correlation coefficients >0.92. These linear functions were then used to calculate the electronegativity of Eu, for which a value of 1.1808 on the Pauling scale was found.

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Section: Introductionmentioning

confidence: 99%

Use of Infrared Spectroscopy for the Determination of Electronegativity of Rare Earth Elements

et al. 2004

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“…Of the many possible rare earth congeners constituting the agardite group, only agardite-(Y) and agardite-(La) are recognized as distinct species by the IMA [1]. Others have been reported in the literature [2][3][4][5][6][7] but their species status remains unresolved. It should be noted that formulae given above refer to ideal, end-member compositions; extensive solid solution in the A site and involving P for As is known for naturally occurring material.…”

Section: Introductionmentioning

confidence: 99%