Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Lanthanide-based luminescent hybrid materials.

Interpretation of europium(III) spectra

Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.

X-Ray Diffraction

Recycling of rare earths: a critical review

Unusual fluorescent properties of Eu3+ in oxyapatites

Site selective spectroscopy and structural analysis of yttria-doped zirconias

Yttrium orthorborate YBO3 containing 0.5 or 5 atom % of Eu3+ has been prepared by the spray-pyrolysis method. Low-temperature, high-resolution emission spectroscopy has been used to probe the local site symmetries of Eu3+ ions accommodated on the Y3+ sites in YBO3:Eu3+ (0.5 atom %) and hence to determine the crystal structure of the title compound. The use of point group selection rules enabled a consistent spectral interpretation by envisaging distinct Ci and C1 symmetry Eu3+ sites, in accordance with the neutron diffraction study of Lin et al. (Chem. Mater. 2004, 16, 2418). The assignment of features in the 10 K visible absorption spectrum of YBO3:Eu3+ (5 atom %) is also consistent with the two-site model, but it was found that the site occupation by Eu3+ differs from the expected ratio 2C1:1Ci. The fitting of 31 crystal-field levels of the C1 site has been made with some approximations by employing 7 parameters. In addition, the emission spectrum of YBO3:Eu3+ containing a trace amount of Y3BO6 has been...

Eu3+ Spectroscopy: A Structural Probe for Yttrium Orthoborate Phosphors

The Raman, IR absorption and EXAFS spectra at the Ge K-edge and Pb LIII-edge of eight lead germanate glasses, with general formula xPbO(1−x)GeO2 with x = 0.20, 0.25, 0.33, 0.40, 0.50, 0.53, 0.56 and 0.60, have been measured. The occurrence of [GeO6] units besides [GeO4] could not be deduced unambiguously from the data. The vibrational and EXAFS data agree with a progressive depolymerization of the network. Starting from all Ge atoms linked to four bridging oxygens in GeO2 (x = 0), the number of tetrahedral units with one or two non-bridging oxygens increases with x. At low content, Pb2+ ions act as modifiers in the germanate structure, but to a lesser extent than an equivalent number of alkaline ions.

Structural studies in lead germanate glasses: EXAFS and vibrational spectroscopy

Site-selective excitation, crystal-field analysis, and energy transfer in europium-doped monoclinic gadolinium sesquioxide. A test of the electrostatic model

Jeannette Dexpert-Ghys

Papers

Unusual fluorescent properties of Eu3+ in oxyapatites

Site selective spectroscopy and structural analysis of yttria-doped zirconias

Eu3+ Spectroscopy: A Structural Probe for Yttrium Orthoborate Phosphors

Structural studies in lead germanate glasses: EXAFS and vibrational spectroscopy

Site-selective excitation, crystal-field analysis, and energy transfer in europium-doped monoclinic gadolinium sesquioxide. A test of the electrostatic model