Structure, Infrared and Raman spectroscopic studies of the new Ba(NbV 0.5MIII0.5)(PO4)2 (MIII = Al, Cr, Fe, In) yavapaiite compounds ‘series

Synthesis and structural study of the new Ba(NbV 0.50MIII 0.50)(PO4)2 (MIII = Al, Cr, Fe, In) phosphates, abbreviated as [BaNbM], were reported here for the first time. Structures of [BaNbM] compounds, obtained by solid-state reaction in air atmosphere, were determined at room temperature from X-ray powder diffraction using the Rietveld method. The four studied compoundsfeature the yavapaiite-type structure, with space group C2/m ( 3 C2h , N°12) and Z = 2. Their framework can be described as consisting of dense slabs of Nb(M)O6 octahedra and PO4 tetrahedra interconnected via corner-sharing, alternating along the c-axis with layers of Ba cations in ten-fold coordination. Raman and Infrared spectroscopic study were used to obtain further structural information about the nature of bonding in selected compositions. Assignments of Nb-O, M-O and P-O Raman and Infrared bands, in [BaNbM] compounds, were based on those already known in the literature for niobium and phosphates oxides. Some empirical relationships, connecting Raman stretching frequencies to the obtained Nb-O and P-O distance values, were also used for assignments of various Raman bands

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Structure of a new CaII1/3SbV1/6BiIII1/2PO4 phosphate

Powder Diffraction ◽

10.1017/s0885715613000717 ◽

2013 ◽

Vol 29 (1) ◽

pp. 14-19 ◽

Cited By ~ 1

Author(s):

Abderrahim Aatiq ◽

My Rachid Tigha

Keyword(s):

Room Temperature ◽

Structural Information ◽

Rietveld Analysis ◽

Infrared Spectroscopic Study ◽

Conventional Solid State Reaction ◽

Monoclinic System ◽

X Ray ◽

Cell Parameters ◽

Air Atmosphere ◽

Crystallographic Structures

A new Ca1/3Sb1/6Bi1/2PO4 “CaSb0.50Bi1.50(PO4)3” phosphate has been synthesized by conventional solid-state reaction techniques at 900 °C in air atmosphere. Their crystallographic structures were determined at room temperature from X-ray powder diffraction (XRPD) data using the Rietveld analysis. CaII1/3SbV1/6BiIII1/2PO4 material possesses the high-temperature BiPO4 monoclinic structure variety. It crystallizes in monoclinic system with P21/m space group and the cell parameters are: a = 4.9358(1) Å, b = 6.9953(2), c = 4.7075(1) Å, and β = 96.2(1)°. Their structure can be described as composed of alternating edge-sharing AO8 (A = Ca, Sb, Bi) bisdisphenoids and PO4 tetrahedra forming chains parallel to the b axis. Every AO8 polyhedron is surrounded by six PO4 and every PO4 tetrahedron is surrounded by six AO8 polyhedra. Infrared spectroscopic study was used to obtain further structural information.

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

Mediterranean Journal of Chemistry ◽

10.13171/mjc10802108201448hb ◽

2020 ◽

Vol 10 (8) ◽

pp. 734

Author(s):

Hajar Bellefqih ◽

Rachid Fakhreddine ◽

Rachid Tigha ◽

Abderrahim Aatiq

Keyword(s):

Diffraction Method ◽

Rietveld Analysis ◽

Spectroscopic Studies ◽

Conventional Solid State Reaction ◽

Space Group ◽

X Ray ◽

Cell Parameters ◽

Raman Spectroscopic ◽

Air Atmosphere ◽

Monoclinic Cell

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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Structural and Raman spectroscopic studies of the two M0.50SbFe(PO4)3 (M = Mg, Ni) NASICON phases

Powder Diffraction ◽

10.1017/s0885715617000331 ◽

2017 ◽

Vol 32 (S1) ◽

pp. S40-S51

Author(s):

Abderrahim Aatiq ◽

Asmaa Marchoud ◽

Hajar Bellefqih ◽

My Rachid Tigha

Keyword(s):

Room Temperature ◽

Structural Information ◽

Rietveld Analysis ◽

Spectroscopic Studies ◽

X Ray Diffraction ◽

X Ray ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Unit Cells ◽

Xrd Patterns

Structures of the two M0.50SbFe(PO4)3 (M = Mg, Ni) phases, abbreviated as [Mg0.50] and [Ni0.50], were determined at room temperature from X-ray diffraction (XRD) powder data using the Rietveld analysis. Both compounds belong to the NASICON structural family. XRD patterns of [Mg0.50] and [Ni0.50] phases were easily indexed with a primitive hexagonal unit cell [P$\overline 3 $ space group, Z = 6] similar to that already obtained for La0.33Zr2(PO4)3. Obtained unit cells parameters are [a = 8.3443(1) Å, c = 22.3629(1) Å], and [a = 8.3384(1), c = 22.3456(1) Å], respectively, for [Mg0.50] and [Ni0.50] phosphates. In both samples, the [Sb(Fe)(PO4)3]− NASICON framework is preserved and a partially-ordered distribution of Sb5+ and Fe3+ ions is observed. Raman spectroscopic study was used to obtain further structural information about the nature of bonding in [Mg0.50] and [Ni0.50] phases.

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CsOH and its Lighter Homologues – a Comparison

Zeitschrift für Naturforschung B ◽

10.5560/znb.2014-4163 ◽

2014 ◽

Vol 69 (11-12) ◽

pp. 1229-1236

Author(s):

Matthias Wörsching ◽

Constantin Hoch

Keyword(s):

Gas Phase ◽

Room Temperature ◽

Structure Type ◽

Alkali Metal Hydroxide ◽

X Ray ◽

Raman Spectroscopic ◽

Cesium Hydroxide ◽

Free Ion ◽

The One ◽

First Time

Abstract Cesium hydroxide, CsOH, was for the first time characterised on the basis of single-crystal data. The structure is isotypic to the one of the room-temperature modification of NaOH and can be derived from the NaCl structure type thus allowing the comparison of all alkali metal hydroxide structures. Raman spectroscopic investigations show the hydroxide anion to behave almost as a free ion as in the gas phase. The X-ray investigations indicate possible H atom positions.

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Local Structures of Carbon Thin Films Synthesized by the Hot Filament Chemical Vapor Deposition Method X-Ray-Absorption Near-Edge Structure and Raman Spectroscopic Studies

Japanese Journal of Applied Physics ◽

10.1143/jjap.30.1073 ◽

1991 ◽

Vol 30 (Part 1, No. 5) ◽

pp. 1073-1083 ◽

Cited By ~ 20

Author(s):

Kunishige Edamatsu ◽

Yasutaka Takata ◽

Toshihiko Yokoyama ◽

Kazuhiko Seki ◽

Masanao Tohnan ◽

...

Keyword(s):

Vapor Deposition ◽

Chemical Vapor ◽

Spectroscopic Studies ◽

Chemical Vapor Deposition Method ◽

Edge Structure ◽

X Ray ◽

Raman Spectroscopic ◽

Local Structures ◽

Hot Filament ◽

X Ray Absorption

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Ion size effect on chemical bonds of the RBa2Cu2.9Zn0.1Oy system

Powder Diffraction ◽

10.1017/s0885715618000520 ◽

2018 ◽

Vol 33 (3) ◽

pp. 209-215

Author(s):

R. Benredouane ◽

C. Boudaren

Keyword(s):

Single Phase ◽

Rietveld Method ◽

Solid State Reaction Method ◽

X Ray ◽

Bond Angles ◽

Bond Valence Sum ◽

Ion Size ◽

First Time ◽

Unique Variation ◽

Strong Curvature

Single-phase polycrystalline samples of RBa2Cu2.9Zn0.1Oy (R = Y, Nd, Gd, Er, and Tm) (ZnR123) were synthesized using the standard solid-state reaction method. They were characterized by X-ray powder diffraction (XRD) and scanning electron microscope. XRD shows that all samples consist essentially of a single phase and retain the orthorhombic structure. The structure of the samples was refined by the Rietveld method with the help of the bond valence sum method. The variation of the lattice parameters and some meaningful bond angles and lengths with the ionic radius are discussed. In these compounds, the variations of the buckling angles Cu2–O(2,3)–Cu2 and Cu2–Cu2–O(2,3) are unique: the bond angles Cu2–O3–Cu2 and Cu2–Cu2–O2 increase, whereas the bond angles Cu2–O2–Cu2 and Cu2–Cu2–O3 decrease. The variation of these bond angles brings about a strong curvature of the Cu2O plane. Furthermore, we have found tree fixed triangles formed by the Cu2, O2, and O3 atoms in addition to another fixed triangle O1–Ba–O1 observed for the first time. BVS of Cu2 atom shows a specific and unique variation compared with other compounds.

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