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| 1 | Thermal and structural properties of Nd2O3-doped calcium boroaluminate glasses显示文摘Nd^(3+) doped CaO-Al_2O-B_2O_3-CaF_2 glasses were prepared by conventional melt-quenching technique,and their structural and thermal properties were studied.The amorphous nature of these samples was confirmed by X-ray diffraction(XRD).The measured density showed an increase with Nd_2O_3 doping,at the expense of CaO.Raman spectra presented changes with addition of Nd_2O_3,which indicated that the network structure of the glasses studied presented various borate groups,such as tetraborates,metaborates,ortho-borates and pyroborates units.The N_4 values calculated from FTIR spectra revealed that incorporation of Nd_2O_3 into glass network converted the structural units from BO_4 to BO_3.From the analysis of DTA curves,we verified that Tg increased with the addition of Nd_2O_3;it was similar to the behavior caused by modifier oxides in the structure of borate glasses.Besides that,the calculated glass stability Tx–Tg for doped samples presented a decrease if compared to the undoped glass.Specific heat and thermal conductivity did not present significant changes with Nd_2O_3 concentration,up to 2.30 mol.%.The results of density,DTA,Raman and FTIR reinforced the idea that Nd_2O_3 acted as network modifier. | J.D.M.Dias G.H.A.Melo T.A.Lodi J.O.Carvalho P.F.Facanha Filho M.J.Barboza A.Steimacher F.Pedrochi | 2016 | Journal of Rare Earths2016，34，5： | 6 |
| 2 | Thermal stability and spectroscopic properties of Ho^(3+) doped tellurite-borate glasses显示文摘Ho3+ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped tellurite-borate glasses. Two methods were used to obtain radiative transition probability of 5I7 level with the aim of assuring the fitting quality. The integral absorption cross-sections and line shapes corresponding to 5I8→5G6 and 5I8→5I7 transition of Ho3+ ions were investigated in tellurite-borate glasses. The obtained data indicated that the integral absorption cross-sections corresponding to 5I8→5G6 transition of Ho3+ ions mainly depended on phenomenological Judd-Ofelt parameter, ?2, because 5I8→5G6 transition belonged to hypersensitive transitions, which led to a larger ?2 value. The change of line shapes of absorption spectra corresponding to 5I8→5G6 and 5I8→5I7 transitions of Ho3+ ions came from the lower energy regions, which could be attributed to the changed distribution of Stark levels and thermal population. | 杨艳民 刘延洲 蔡培庆 Ramzi Maalej Hyo Jin Seo | 2015 | Journal of Rare Earths2015，33，9： | 1 |
| 3 | Preparation by chemical co-precipitation, spectral and electrical characteristics of neodymium orthophosphate nanoparticles显示文摘Nanoparticles of neodymium orthophosphate(Nd PO4) were prepared through a facile wet co-precipitation technique. The X-ray diffraction(XRD) studies revealed the material belonging to monoclinic monazite phase with crystallite size of 30.8 nm. Scanning electron microscopic studies showed that the material was composed of a large number of agglomerated spherical particles having grain size of 92 nm. Thermogravimetric analysis suggested that the structural phase transition was seen above 800 °C. The spectroscopic investigations were carried out using Fourier transform infrared spectroscopy(FTIR). UV-VIS-NIR absorption spectrophotometer showed various transitions from the ground state 4I9/2 to various excited states within the 4f shell and the optical band gap came out to be 3.3 e V. The dielectric constant(ε′), dielectric loss(tan δ) and ac conductivity ln(σac) were measured in the frequency range of 5 k Hz to 1 MHz and in the temperature range of 40 to 500 °C. The dielectric measurement suggested that there was a shift in the value of transition temperature(Tc), thereby indicating relaxor behaviour of the material. The activation energy value decreased with increase in frequency, thereby suggesting the role of mixed ionic-polaronic conductivity. | Seema Verma K.K.Bamzai | 2015 | Journal of Rare Earths2015，33，5： | 0 |
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