New phosphosilicates with nasicon structure type

Bakhous, Karima; Cherkaoui, F.; Benabad, A.; Savariault, Jean‐Michel

doi:10.1016/s0025-5408(99)00011-2

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…NZP-type phosphates containing f-elements (lanthanides) are reported in literature in several papers [8][9][10][11][12] and these studies indicate that lanthanide cations can occupy both framework and interstitial positions of the structure. However, they can only exist as framework forming cations in case their radius does not exceed ∼90 pm, e.g.…”

Section: Introductionmentioning

confidence: 99%

High-temperature investigations of the rare earth NZP phosphates R1/3Zr2(PO4)3 (R= La, Nd, Eu, Lu) by drop calorimetry

Bykov

Konings

Орлова

2007

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

High-temperature investigations of the rare earth NZP phosphates R1/3Zr2(PO4)3 (R= La, Nd, Eu, Lu) by drop calorimetry

Bykov

Konings

Орлова

2007

Journal of Alloys and Compounds

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“…Examples of these phosphates include Eu 2 þ : Eu 0.5 Zr 2 (PO 4 ) 3 :Eu [2], Ca 0.5 Zr 2 (PO 4 ) 3 :Eu, Sr 0.5 Zr 2 (PO 4 ) 3 :Eu, Ba 0.5 Zr 2 (PO 4 ) 3 :Eu [3], Ca 0.5 x Eu x Zr 2 (PO 4 ) 3 [4]; Eu 3 þ : Eu 0.33 Zr 2 (PO 4 ) 3 [5], Na 3 Al 2 (PO 4 )3: Eu [6], Ca 0.5 Fe 1 x Eu x Sb(PO 4 ) 3 [7], La 1/6 Pb 1/3 Zr 2 (PO 4 ) 17/6 (SiO 4 ) 1/6 :Eu [8];…”

Section: Introductionunclassified

Temperature induced phase transition of CaMn0.5Zr1.5(PO4)3 phosphate

Orlova

Perfler

Tribus

et al. 2016

Journal of Solid State Chemistry

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In this work we investigated the structural behaviour of a CaMn 0.5 Zr 1.5 (PO 4 ) 3 . Due to the presence of divalent Mn 2 þ cations this compound can possess interesting luminescence properties. It was recently understood that this phosphate undergoes a temperature induced irreversible phase transition in the range of 800 875°C. It has also been shown that the 3d 3d luminescence of Mn 2 þ increases 10 fold for the high temperature polymorph. To determine the Mn environment structural investigations of both phases have been performed by the X ray powder diffraction and Raman spectroscopy methods. The low temperature modification adopts the trigonal NZP structure type with a slightly lower symmetry (space group R32, a¼ 8.7850(2) Å, c¼ 22.6496(7) Å, V¼1514.8(1) Å 3 ). The high temperature form in turn has orthorhombic symmetry (space group Pnma, a ¼6.2350(3) Å, b ¼6.6281(3) Å, c¼ 14.4731(6) Å, V¼ 598.13(5) Å 3 ). Both structures were solved ab initio from powder data and structural analysis was performed. In situ and RT Raman spectra are consistent with the XRD derived structural model. Mn 2 þ cations occupy different types of positions in these structures and a change in Mn coordination number (6 for LT phase, 7 for HT phase) results in different Mn O bond lengths. These differences may explain the change in the optical properties between the polymorphs.

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“…The hexagonal unit cell for the Nasicon-type compounds ( Previous structural investigations of phosphates or phosphosilicates isotypic to NaZr (PO ) [NZP] (2) have shown that the rare earth element may occupy either the zirconium octahedral site (6}10) or the M1 antiprism (11,12). Recently, a new family of phosphosilicates with the formula¸n Pb Zr (PO ) (SiO ) (¸n"La, Nd, Sm, Eu, Gd, Tb, Er, and Yb) has been synthesized (13). The structural re"nement by the Rietveld method in the R3 group has shown that both 3a (000) and 3b (001/2) positions of the M1 site are occupied by the La> and Pb> ions.…”

Section: Introductionmentioning

confidence: 99%