Luminescence of Agrellite Specimen from the Kipawa River Locality

Czaja, M.; Lisiecki, Radosław

doi:10.3390/min9120752

Cited by 3 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The charge compensation mechanism is discussed below. A similar band was observed in agrellite having almost equivalent ligand field [32,43]. Contrary to the information in the [42], the luminescence of Eu 2+ peaked at 410 nm was not been observed in agrellite by [43].…”

Section: Spectroscopysupporting

confidence: 54%

“…A similar band was observed in agrellite having almost equivalent ligand field [32,43]. Contrary to the information in the [42], the luminescence of Eu 2+ peaked at 410 nm was not been observed in agrellite by [43]. Five peaks in the excitation spectrum correspond to transitions from the ground 4f state of the Ce 3+ ion to the crystal field split 5d state.…”

Section: Spectroscopysupporting

confidence: 49%

See 1 more Smart Citation

Fedorite from Murun Alkaline Complex (Russia): Spectroscopy and Crystal Chemical Features

et al. 2020

View full text Add to dashboard Cite

Fedorite is a rare phyllosilicate, having a crystal structure characterized by SiO4-tetrahedral double layers located between continuous layers formed by edge-sharing (Ca,Na)-octahedra, and containing interlayer K, Na atoms and H2O molecules. A mineralogical-petrographic and detailed crystal-chemical study of fedorite specimens from three districts of the Murun alkaline complex was performed. The sequence of the crystallization of minerals in association with fedorite was established. The studied fedorite samples differ in the content of interlayer potassium and water molecules. A comparative analysis based on polyhedral characteristics and deformation parameters was carried out. For the first time, EPR, optical absorption and emission spectra were obtained for fedorite. The raspberry-red coloration of the mineral specimens could be attributed to the presence of Mn4+ ions.

show abstract

Section: Spectroscopysupporting

confidence: 54%

Section: Spectroscopysupporting

confidence: 49%

Fedorite from Murun Alkaline Complex (Russia): Spectroscopy and Crystal Chemical Features

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Recently, agrellite has received much attention as a luminescence material and has been studied extensively. It was discovered that materials based on agrellite, doped with a certain amount of rare earth ions, can be efficient white light emitter 1 and promising phosphors 2 .…”

Section: Introductionmentioning

confidence: 99%

Structural and vibrational properties of agrellite

Канева

Bogdanov

Shendrik

2020

Sci Rep

View full text Add to dashboard Cite

Agrellite, NaCa2Si4O10F, is a tubular silicate mineral which crystal structure is characterized by extended [Si8O20]8– tubes and has a two-dimensional channel system. The mineral is a representative of a complex silicate family which contains some structural voids but cannot be considered as microporous because of small channel widths. However, the channel system of such minerals is able to host single guest atoms, molecules or radicals which can affect their physical properties. Presently, the exact mechanism of such hosting is undetermined. However, such information could be quite useful for materials’ application as zeolites as well as for a better understanding of their formation mechanisms. In this work we couple X-ray diffraction, infrared (IR) spectroscopy and ab initio calculations to identify structural features in agrellite from Malyy Murun massif (Russia) caused by incorporation of either H2O or OH− into the channel system. We construct structural models of water-containing NaCa2Si4O10F and identified H2O positions. The derivation of H2O sites is based on simulation of IR-spectra. Infrared spectroscopy in combination with the ab initio calculation has proven to be an effective tool for the identification of the structural positions of hydroxyl anions (OH−) and neutral water groups (H2O) in minerals.

show abstract