Dielectric investigation of MIIMIV(PO4)2 double orthophosphates (MII=Ca, Sr, Ba, Pb; MIV=Ti, Zr, Hf, Ge, Sn)

Tudorache, Florin; Popa, Karin; Mitoşeriu, Liliana; Lupu, N.; Brégiroux, Damien; Wallez, Gilles

doi:10.1016/j.jallcom.2011.06.072

Cited by 25 publications

(9 citation statements)

References 41 publications

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“…A recent work detailed the dielectric properties of ten ceramics in the M II M′ IV (PO 4 ) 2 family [88]. Yavapaiite compounds were found to be faint ionic conductors.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Crystal chemistry of MIIM′IV(PO4)2 double monophosphates

Brégiroux

Popa

Wallez

2015

Journal of Solid State Chemistry

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a b s t r a c t M II M′ IV (PO 4 ) 2 compounds have been extensively studied for several decades for their potential applications in the field of several domains such as matrices for actinides conditioning, phosphors etc. In this paper, the relationships between composition and crystal structure of these compounds are established. A review of the various processes used for the synthesis of these compounds is also proposed, as well as their most reported properties. M II M′ IV (PO 4 ) 2 structures stem from two different archetypes: the cheralite and the yavapaiite structures, with some exceptions that are also described in this article. The ratio of the cations radii appears to be the most relevant parameter. The high ratio between the ionic radii of the divalent and tetravalent cations in yavapaiite derivates results in the ordering of these cations into well-differentiated polyhedra whereas cheralite is the only non-ordered structure encountered for M II M′ IV (PO 4 ) 2 compounds.

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“…A recent work detailed the dielectric properties of ten ceramics in the M II M′ IV (PO 4 ) 2 family [88]. Yavapaiite compounds were found to be faint ionic conductors.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Crystal chemistry of MIIM′IV(PO4)2 double monophosphates

Brégiroux

Popa

Wallez

2015

Journal of Solid State Chemistry

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“…IV (PO 4 ) 2 compounds (M II = Cd, Ca, Sr, Pb, Ba; M' IV = Ge, Ti, Mo, Sn, Hf, Zr, Pu, Np, U, Th) are subject of intensive research since they are proved to be interesting as ionic conductors, dielectrics, catalysts, ion exchangers, luminescent materials and UV-emitting Xray phosphors [1][2][3][4][5][6][7]. They also find applications in the nuclear cycle, either as host matrices for actinide radwastes or, more recently, as products of the reaction of the spent nuclear fuel with tributyl phosphate during the reprocessing [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: M'mentioning

confidence: 99%

“…Nevertheless, some compositions exhibit a clearly different crystal structure, like CaZr(PO 4 ) 2 , PbSn(PO 4 ) 2 and SrNp(PO 4 ) 2 [1,29,30]. The structure of CaZr(PO 4 ) 2 was determined for the first time by Fukuda et al from powder diffraction data [31].…”

Section: M'mentioning

confidence: 99%

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Structural study of polymorphism and thermal behavior of CaZr(PO4)2

Brégiroux

Wallez

Popa

2015

Solid State Sciences

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The crystal structure of CaZr(PO 4 ) 2 has been revised by ab initio Rietveld analysis of X-ray powder diffraction data. At room temperature, CaZr(PO 4 ) 2 crystallizes in the orthorhombic space group Pna2 1 (Z = 4). Differential thermal analysis suggests a reversible second order transition at 1000°C confirmed by high temperature XRD analysis that brings out the existence of a high temperature form, very similar to the room temperature one, but more symmetrical (Pnma, Z = 4). Analysis of the crystal parameters evolution during heating reveals that CaZr(PO 4 ) 2 exhibits a quite low thermal expansion coefficient of 6.11 10 -6 K -1 .This value stems from a combination of several mechanisms, including Coulombic repulsion and bridging oxygen rocking motion.Keywords: Crystal structure; thermal expansion; calcium zirconium phosphate Highlights:Room temperature structure CaZr(PO 4 ) 2 was revised A high temperature form of CaZr(PO 4 ) 2 was described for the first time Thermal expansion of CaZr(PO 4 ) 2 was studied on the basis of the evolution of the crystal parameters evolution during heating M

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“…Phosphates with general A II M IV (PO4)2 formula have attracted significant attention for several decades due to their optical [1][2][3][4][5] , magnetic 6 , and dielectric properties 7 . Furthermore, they have also proved attractive as potential candidates for the immobilization of tetravalent actinides [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Structure, Infrared and Raman spectroscopic studies of new AII(SbV0.50CrIII0.50)(PO4)2 (A = Ba, Sr, Pb) yavapaiite phases

et al. 2020

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Three new AII(Sb0.5Cr0.5)(PO4)2 (AII = Ba, Sr, Pb) yavapaiite phases, abbreviated as [ASbCr], have been successfully synthesized by a conventional solid-state reaction in air atmosphere. Their crystal structures have been investigated by Rietveld analysis from the X-ray powder diffraction method. Results show that Ba(Sb0.5Cr0.5)(PO4)2 crystallizes in monoclinic C2/m space group (Z = 2) with cell parameters a = 8.140(1) Å; b = 5.175(1) Å; c = 7.802(1) Å and β = 94.387(1)°. Structures of AII(Sb0.5Cr0.5)(PO4)2 (AII = Sr, Pb) compounds are comparable, and both crystallize in a distorted yavapaiite structure with C2/c space group (Z = 4). Obtained monoclinic cell parameters are: a = 16.5038(2) Å; b = 5.1632(1) Å; c = 8.0410(1) Å; β = 115.85(1) for [SrSbCr] and a = 16.684(2) Å; b = 5.156(1) Å c = 8.115(1) Å; β = 115.35(1)° for [PbSbCr]. Infrared and Raman spectroscopic study was undertaken to provide information about vibrations bonds within the studied yavapaiite materials.

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Dielectric investigation of MIIMIV(PO4)2 double orthophosphates (MII=Ca, Sr, Ba, Pb; MIV=Ti, Zr, Hf, Ge, Sn)

Cited by 25 publications

References 41 publications

Crystal chemistry of MIIM′IV(PO4)2 double monophosphates

Crystal chemistry of MIIM′IV(PO4)2 double monophosphates

Structural study of polymorphism and thermal behavior of CaZr(PO4)2

Structure, Infrared and Raman spectroscopic studies of new AII(SbV0.50CrIII0.50)(PO4)2 (A = Ba, Sr, Pb) yavapaiite phases

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