Lanthanum-Neodymium-Co-Substituted Calcium Fluorobritholites

Hidouri, Mustapha; Albeladi, Nawaf

doi:10.4236/msce.2018.67016

Cited by 3 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This fact was related to a disorder induced in the apatite network caused by the substitution of La by Nd. This was previously seen with doped with rare earth apatite's [46][47][48].…”

Section: P Nmr Spectroscopysupporting

confidence: 59%

Ionic Conductivity of Strontium Fluoroapatites Co-doped with Lanthanides

Kthiri¹,

Mehnaoui²,

Jebahi³

et al. 2022

Mineralogy

Self Cite

View full text Add to dashboard Cite

Britholites derivatives of apatite’s that contain lanthanium and neodymium in the serial compounds Sr8La2−xNdx(PO4)4(SiO4)2F2 with 0 ≤ x ≤ 2 were subject of the present investigation. The solid state reaction was the route of preparing these materials. Several techniques were employed for the analysis and characterization of the synthesized powders. The chemical analysis results indicated that molar ratio Sr+La+NdP+Si was of about 1.67 value of a stoichiometric powder. The X-ray diffraction data showed single-phase apatites crystallizing in hexagonal structure with P63/m space group were successively obtained. Moreover, the substitution of lanthanium by neodymium in strontium phosphosilicated fluorapatite was total. This was confirmed by the a and c lattice parameters contraction when (x) varies coherently to the sizes of the two cations. The infrared spectroscopy and the 31P NMR (MAS) exhibited the characteristic bands of phosphosilicated fluorapatite. The pressureless sintering of the material achieved a maximum of 89% relative density. The sintered specimens indicated that the Nd content as well as the heating temperature affected the ionic conduction of the materials and the maximum was 1.73 × 10−6 S cm−1 obtained at 1052 K for x = 2.

show abstract

“…This fact was related to a disorder induced in the apatite network caused by the substitution of La by Nd. This was previously seen with doped with rare earth apatite's [46][47][48].…”

Section: P Nmr Spectroscopysupporting

confidence: 59%

Ionic Conductivity of Strontium Fluoroapatites Co-doped with Lanthanides

Kthiri¹,

Mehnaoui²,

Jebahi³

et al. 2022

Mineralogy

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hydroxyapatite is a kind of apatite crystal whose general molecular formula is Me 10 (XO 4 ) 6 Y 2 . In this study, the Me is a divalent cation, XO 4 is the negative trivalent group, and Y is a negative monovalent ion [22]. For RE-doped apatite with a different fluorine substitution ratio, RE ions will occupy the position of Me and Y will be replaced by F − ions.…”

Section: Phase Composition and Chemical Structurementioning

confidence: 99%

Effect of the Fluorine Substitution for –OH Group on the Luminescence Property of Eu3+ Doped Hydroxyapatite

et al. 2020

View full text Add to dashboard Cite

In this study, different fluoridated hydroxyapatite doped with Eu3+ ion nanoparticles were prepared by the hydrothermal method. The relationship between luminescence enhancement of Eu3+ ions and a fluorine substitution ratio for hydroxyl group in hydroxyapatite was discussed. Moreover, the effect of fluorine substitution for a hydroxyl group on phase composition, crystallinity, and crystal size was studied. Phase composition and chemical structures were identified by X-ray diffraction (XRD) and Fourier Transform Infrared (FT-IR) Spectroscopy analyses. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) patterns were performed to analyze the morphology and particle size. X-ray Photoelectron Spectroscopy (XPS) patterns were observed to analyze fluorine substitution for the hydroxyl group and chemical state of Eu3+ ions in fluoridated hydroxyapatite. The results of these experiments indicated that the samples with a different fluorine substitution ratio were prepared successfully by maintaining the apatite structure. With an increasing fluorine substitution ratio, the morphology maintained a rod-like structure but the aspect ratio tended to decrease. XPS patterns displayed that the fluorine replaced the hydroxyl group and brought environmental variation. The fluorine ions could affect the crystal field environment and promote luminescence conversion. There was a linear relationship between the fluorine substitution ratio and luminescence enhancement.

show abstract