Structural, microstructural and vibrational characterization of apatite-type lanthanum silicates prepared by mechanical milling

Rodríguez-Reyna, E.; Fuentes, Antonio F.; Mączka, M.; Hanuza, J.; Boulahya, Khalid; Amador, Ulises

doi:10.1016/j.jssc.2005.11.008

Cited by 79 publications

(67 citation statements)

References 21 publications

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“…[33] AFM and transmission electron microscopy (TEM) analysis show that the resulting particles are quite monodisperse after the baking process, as shown in Figures 5 and 6, respectively. In addition, these nanoparticles are highly dispersible in water.…”

Section: Full Papermentioning

confidence: 94%

Dispersible Tm³⁺‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Diamente

Raudsepp

Veggel

2007

Adv Funct Materials

108

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A general procedure is described for the synthesis and conversion of dispersible core/shell LaF3:Tm/LaF3 nanoparticles to highly dispersible thulium‐doped lanthanum disilicate nanoparticles (La2Si2O7:Tm) with an average diameter of 7 nm that show emission at a wavelength of 1.47 μm. Measurement of the citrate‐stabilized precursor nanoparticles in a KBr pellet shows a 1.47 μm emission with an effective lifetime of only 3 μs and an estimated quantum yield of ≪ 1 %. However, significant improvements to the emission properties are obtained by forming a ca. 1 nm thick silica shell around the nanoparticles via a modified Stöber method, followed by baking at 900 °C for 12 h to convert the LaF3 matrix to La2Si2O7. Excitation with a 785 nm continuous wave (CW) diode laser results in the luminescence of the 3H4–3F4 transition at 1.47 μm with an effective lifetime of 56 μs and an estimated quantum yield of 4 %. High‐resolution measurements at 77 K are carried out in order to improve the resolution of the crystal‐field splitting observed from the 3H4 level.

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Section: Full Papermentioning

confidence: 94%

Dispersible Tm³⁺‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Diamente

Raudsepp

Veggel

2007

Adv Funct Materials

108

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“…Due to the wide variety of applications and unique oxygen ion conduction mechanism, the structure of lanthanide silicate apatite has been extensively studied by various experimental methods, such as single crystal and powder x-ray diffraction (XRD) 13,14 , neutron diffraction 12,15 , nuclear magnetic resonance (NMR) 9 , and optical spectroscopy [16][17][18] , as well as theoretical 3 modeling 19 . There are, however, still unresolved issues related to the lattice symmetry, the accuracy of parameter values and their influence on critical properties 13,15,17,19 .…”

Section: Introductionmentioning

confidence: 99%

Phase transition and abnormal compressibility of lanthanide silicate with the apatite structure

et al. 2012

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The lanthanide silicate, La 9.33 Si 6 O 26 , which has the hexagonal apatite structure (P6 3 /m), was investigated at high pressure. A subtle phase transition was observed at ~13.3 GPa by in situ synchrotron x-ray diffraction (XRD) and confirmed by infrared absorption (IR) and Raman scattering measurements. The high-pressure phase has a structure similar to that of the initial hexagonal apatite structure, but the symmetry is reduced to P6 3 through the displacement of one oxygen site and tilting of the SiO 4 tetrahedra. Interestingly, the highpressure phase has an abnormally lower compressibility, which is caused by the change in symmetry that allows the tilting of the SiO 4 tetrahedra, and the bulk modulus of the highpressure phase is only half that of the apatite structure.2

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“…IR spectra (Figure 3) confirm that the apatite phase formation starts after 5 min MA: the band at 912 cm -1 attributed to asymmetric stretching vibrations in isolated SiO 4 tetrahedron of the apatite (Rodriguez-Reyna et al, 2006), which is absent in the spectrum of the initial mixture, appears. Concurrently, the bands assigned to the starting Al(OH) 3 disappear and the new band at ~792 cm -1 attributed to Al-O modes in AlO 4 is revealed (Plusnina, 1967).…”

Section: Mechanochemical Activationmentioning

confidence: 83%

“…Alternative methods such as coprecipitation or the sol-gel route were shown to favour the formation of ATLS already at temperatures around 800°C (Tao and Irvine, 2000;Celerier et al, 2006). Mechanical milling of the mixture of parent materials in a planetary ball mill for several hours provides the production of ATLS even at room temperature (Tzvetkov and Minkova, 1999;Rodriguez-Reyna et al, 2006). However such low-temperature methods have been successfully used only for the synthesis of undoped ATLS.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis Methods of Doped Apatite-Type Lanthanum Silicates

Kharlamova

Pavlova

Садыков

et al. 2007

J. Chem. Eng. Japan / JCEJ

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Structural, microstructural and vibrational characterization of apatite-type lanthanum silicates prepared by mechanical milling

Cited by 79 publications

References 21 publications

Dispersible Tm³⁺‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Dispersible Tm³⁺‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Phase transition and abnormal compressibility of lanthanide silicate with the apatite structure

Low-Temperature Synthesis Methods of Doped Apatite-Type Lanthanum Silicates

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Structural, microstructural and vibrational characterization of apatite-type lanthanum silicates prepared by mechanical milling

Cited by 79 publications

References 21 publications

Dispersible Tm3+‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Dispersible Tm3+‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Phase transition and abnormal compressibility of lanthanide silicate with the apatite structure

Low-Temperature Synthesis Methods of Doped Apatite-Type Lanthanum Silicates

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Dispersible Tm³⁺‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

Dispersible Tm³⁺‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence