Search results for "Yttrium"
showing 10 items of 179 documents
Thermoluminescence properties of AlN ceramics
1998
Abstract The paper describes thermoluminescence (TL) properties of AlN:Y 2 O 3 ceramics irradiated with ionising radiation. A high TL sensitivity of AlN:Y 2 O 3 ceramics to radiation encouraged a study of the AlN ceramics for application as a dosimetric material. The paper presents experimental data on: glow curve, emission spectrum, dose response, energy dependence, influence of heating rate and fading rate. The measured TL characteristics were compared with those of well-known, widely used TLDs, i.e. LiF:Mg,Ti, LiF:Mg,Cu,P and Al 2 O 3 :C. It is concluded that AlN:Y 2 O 3 ceramics showing a radiation sensitivity which is approximately 50 times greater than that of LiF:Mg,Ti is an interest…
Luminescence of cerium doped YAG nanopowders
2007
Abstract Cerium doped YAG nanopowders with grain size ∼ 20 nm have been synthesized by co-precipitation method. Time-resolved luminescence characteristics have been studied. The results obtained have been compared with the luminescence characteristics for well-studied YAG single crystals. In contrast to cerium doped YAG crystals, cerium doped nanocrystal does not reveal luminescence bands due to antisite defects under electron beam pulse and X-ray excitations at 80–300 K temperature range. It was detected that decay kinetic of Ce 3 + related emission in the nanocrystal can be approximated by two exponents with time constants ∼ 9 and ∼ 47 ns at 290 K. It is faster than single exponential dec…
Multiple teeth replacement with endosseous one-piece yttrium-stabilized zirconia dental implants
2012
Objectives: The purpose of this study is to clinically and radiographically evaluate survival and success rate of multiple zirconia dental implants positioned in each patient during a follow-up period of at least 12 months up to 48 months. Study Design: Eight patients were treated for multiple edentulism with 29 zirconia dental implants. All implants received immediate temporary restorations and 6 months after surgery were definitively restored. 6 months to 4 years after implant insertion, a clinical-radiographic evaluation was performed in order to estimate peri-implant tissues health and peri-implant marginal bone loss. Results: Survival rate within follow-up period was therefore 100%. Th…
The behaviour of REEs in Thailand's Mae Klong estuary: Suggestions from the Y/Ho ratios and lanthanide tetrad effects
2007
Abstract The concentrations of Rare Earth Elements and yttrium (REY) were measured in dissolved phase, in suspended particulate matter (SPM) and in sediments in seven sampling stations in the Mae Klong estuarine system (Inner Thailand Gulf) in order to study their behaviour and distribution pattern. The analysed samples generally show high Rare Earth Element (REE) content in the dissolved phase, with high Medium Rare Earth Elements (MREEs) and Y enrichments in the shale-normalized pattern (versus PAAS). These chemical features are interpreted in terms of direct influences of weathering processes of REE-rich minerals (e.g., phosphates), which abundantly out-crop in the Mae Klong watershed. T…
CCDC 170823: Experimental Crystal Structure Determination
2002
Related Article: S.Arndt, A.Trifonov, T.P.Spaniol, J.Okuda, M.Kitamura, T.Takahashi|2002|J.Organomet.Chem.|647|158|doi:10.1016/S0022-328X(01)01421-8
CCDC 235921: Experimental Crystal Structure Determination
2004
Related Article: P.Voth, T.P.Spaniol, J.Okuda|2003|Organometallics|22|3921|doi:10.1021/om0303707
CCDC 207942: Experimental Crystal Structure Determination
2003
Related Article: J.Terrematte, S.Daniele, L.G.Hubert-Pfalzgraf, J.M.Decams, H.Guillon, P.Richard|2003|Inorg.Chem.Commun.|6|1039|doi:10.1016/S1387-7003(03)00160-6
CCDC 235919: Experimental Crystal Structure Determination
2004
Related Article: P.Voth, T.P.Spaniol, J.Okuda|2003|Organometallics|22|3921|doi:10.1021/om0303707
CCDC 202192: Experimental Crystal Structure Determination
2004
Related Article: T.P.Spaniol, J.Okuda, M.Kitamura, T.Takahashi|2003|J.Organomet.Chem.|684|194|doi:10.1016/S0022-328X(03)00525-4
CCDC 170821: Experimental Crystal Structure Determination
2002
Related Article: S.Arndt, A.Trifonov, T.P.Spaniol, J.Okuda, M.Kitamura, T.Takahashi|2002|J.Organomet.Chem.|647|158|doi:10.1016/S0022-328X(01)01421-8