scholarly journals Synthesis and crystal structure of a new magnesium phosphate Na3RbMg7(PO4)6

2017 ◽  
Vol 73 (6) ◽  
pp. 817-820 ◽  
Author(s):  
Teycir Ben Hamed ◽  
Amal Boukhris ◽  
Abdessalem Badri ◽  
Mongi Ben Amara
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Three Dimensional ◽  
Structure Type ◽  
Magnesium Phosphate ◽  
Original Structure ◽  
Flux Method ◽  
Synthesis And Crystal Structure

A new magnesium phosphate, Na3RbMg7(PO4)6 [trisodium rubidium heptamagnesium hexakis(orthophosphate)], has been synthesized as single crystals by the flux method and exhibits a new structure type. Its original structure is built up from MgO x (x = 5 and 6) polyhedra linked directly to each other through common corners or edges and reinforced by corner-sharing with PO4 tetrahedra. The resulting anionic three-dimensional framework leads to the formation of channels along the [010] direction, in which the Na+ cations are located, while the Rb+ cations are located in large interstitial cavities.

scholarly journals Synthesis, crystal structure and charge-distribution validation of a new alluaudite-type phosphate, Na2.22Mn0.87In1.68(PO4)3

2020 ◽  
Vol 76 (8) ◽  
pp. 1369-1372
Author(s):  
Abdessalem Badri ◽  
Inmaculada Alvarez-Serrano ◽  
María Luisa López ◽  
Mongi Ben Amara
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Three Dimensional ◽  
Structure Type ◽  
X Ray Diffraction ◽  
Flux Method ◽  
X Ray ◽  
Coordination Numbers ◽  
Dimensional Network ◽  
Anionic Framework

Na2.22Mn0.87In1.68(PO4)3, sodium manganese indium tris(phosphate) (2.22/0.87/1.68), was obtained in the form of single crystals by a flux method and was structurally characterized by single-crystal X-ray diffraction. The compound belongs to the alluaudite structure type (space group C2/c) with general formula X(2)X(1)M(1)M(2)2(PO4)3. The X(2) and X(1) sites are partially occupied by sodium [occupancy 0.7676 (17) and 1/2] while the M(1) and M(2) sites are fully occupied within a mixed distribution of sodium/manganese(II) and manganese(II)/indium, respectively. The three-dimensional anionic framework is built up on the basis of M(2)2O10 dimers that share opposite edges with M(1)O6 octahedra, thus forming infinite chains extending parallel to [10\overline{1}]. The linkage between these chains is ensured by PO4 tetrahedra through common vertices. The three-dimensional network thus constructed delimits two types of hexagonal channels, resulting from the catenation of M(2)2O10 dimers, M(1)O6 octahedra and PO4 tetrahedra through edge- and corner-sharing. The channels are occupied by Na+ cations with coordination numbers of seven and eight.

scholarly journals RbZnFe(PO4)2: synthesis and crystal structure

2016 ◽  
Vol 72 (8) ◽  
pp. 1074-1076 ◽  
Author(s):  
Abdessalem Badri ◽  
Mongi Ben Amara
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Three Dimensional ◽  
Iron Phosphate ◽  
Flux Method ◽  
Acta Cryst ◽  
Synthesis And Crystal Structure

A new iron phosphate, rubidium zinc iron(III) phosphate, RbZnFe(PO4)2, has been synthesized as single crystals by the flux method. This compound is isostructural to the previously reported KCoAl(PO4)2[Chenet al.(1997).Acta Cryst.C53,1754–1756]. Its structure consists of a three-dimensional framework built up from corner-sharing PO4and (Zn,Fe)O4tetrahedra. This mode of linkage forms channels parallel to the [100], [010] and [001] directions in which the Rb+ions are located.

Zur Synthese und Kristallstruktur von Dibariumkaliumtrizinkborat Ba2KZn3(B3O6)(B6O13)/Synthesis and Crystal Structure of Di-barium Potassium Tri-zinc Borate Ba2KZn3(B3O6)(B6O13)

1996 ◽  
Vol 51 (3) ◽  
pp. 319-324 ◽  
Author(s):  
Silke Busche ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Type ◽  
Lattice Parameters ◽  
Zinc Borate ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Unknown Structure

Abstract Single crystals of the new compound Ba2KZn3(B3O6)(B6O13) were obtained by using a B2O3 flux technique; they crystallize in an as yet unknown structure type. X-ray investigations led to the space group Ci1-P1̄ (Nr.2) with lattice parameters a = 705.2(2), b = 712.5(2), c = 1880.3(6), a = 93.43(3)°, β = 90.72(2)°, γ = 119.57(2)°, Z = 2. The structure contains (B3O6)3--rings and a new discrete (B6O13)8- anion, which is composed of two BO4 and two B2O5 units. Zn2+ is tetrahedrally coordinated by oxygen and two out of three tenfold coordinated Ba-sites are statistically occupied by Ba2+ and K+.

scholarly journals Synthesis and crystal structure of NaCuIn(PO4)2

2020 ◽  
Vol 76 (3) ◽  
pp. 366-369
Author(s):  
Elhassan Benhsina ◽  
Jamal Khmiyas ◽  
Said Ouaatta ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Three Dimensional ◽  
Atmospheric Conditions ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Sodium Cations ◽  
Oxygen Atoms

Single crystals of sodium copper(II) indium bis[phosphate(V)], NaCuIn(PO4)2, were grown from the melt under atmospheric conditions. The title phosphate crystallizes in the space group P21/n and is isotypic with KCuFe(PO4)2. In the crystal, two [CuO5] trigonal bipyramids share an edge to form a dimer [Cu2O8] that is connected to two PO4 tetrahedra. The obtained [Cu2P2O12] units are interconnected through vertices to form sheets that are sandwiched between undulating layers resulting from the junction of PO4 tetrahedra and [InO6] octahedra. The two types of layers are alternately stacked along [101] and are joined into a three-dimensional framework through vertex- and edge-sharing, leaving channels parallel to the stacking direction. The channels host the sodium cations that are surrounded by four oxygen atoms in form of a distorted disphenoid.

Synthese und Kristallstruktur von Pt2Sn2Zn3, der ersten ternären Verbindung im System Pt/Sn/Zn / Synthesis and Crystal Structure of Pt2Sn2Zn3, the First Ternary Compound of the Pt/Sn/Zn System

2006 ◽  
Vol 61 (7) ◽  
pp. 862-866 ◽  
Author(s):  
Rainer Lux ◽  
Harald Hillebrecht
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Single Crystals ◽  
Ternary Compound ◽  
Structure Type ◽  
Synthesis And Crystal Structure ◽  
Binary Compounds

Single crystals of Pt2Sn2Zn3, the first ternary compound in the system Pt/Sn/Zn, have been synthesised from the elements. Pt2Sn2Zn3 exhibits a new structure type (hP14, P63/mmc, Z = 2, a = 4.3367(5), c = 15.532(3) Å , 402 reflections, 14 variables, R1(F) = 0.025, wR2(I) = 0.059) with motifs of the binary compounds. One Pt atom has a cubic environment (PtSn6Zn2), the second one forms an Edshammer polyhedron (PtSn2Zn9). Pt2Sn2Zn3 is one of the few examples of a ternary Sn/Zn compound of a transition metal.

Crystal Chemistry of Uranyl Halides Containing Mixed (UO2)(XmOn)5 Bipyramids (X = Cl, Br): Synthesis and Crystal Structure of Cs2(UO2)(NO3)Cl3

2011 ◽  
Vol 66 (2) ◽  
pp. 142-s147 ◽  
Author(s):  
Evgeny V. Nazarchuk ◽  
Oleg I. Siidra ◽  
Sergey V. Krivovichev
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Single Crystals ◽  
Uranyl Nitrate ◽  
Three Dimensional ◽  
Direct Methods ◽  
Mixed Ligand ◽  
Chloride Complexes ◽  
Synthesis And Crystal Structure ◽  
Cl Atoms

Single crystals of Cs2(UO2)(NO3)Cl3 were prepared by a hydrothermal method at 205 °C. The crystal structure has been solved by Direct Methods: monoclinic, P21/n, a = 10.3748(13), b = 9.4683(13), c = 12.5535(16) Å, β = 110.280(2)◦, V = 1156.7(3) Å3, R1 = 0.029. In the structure, strongly bonded linear uranyl cations UO22+ are equatorially coordinated by two O and three Cl atoms to form (UO2)Cl3O2 pentagonal bipyramids. Each bipyramid shares its O-O edge with an adjacent (NO3)− anion to form finite clusters with the chemical composition [(UO2)(NO3)Cl3]2−. The Cs+ cations provide three-dimensional connectivity of the structure by forming Cs-O and Cs-Cl contacts to the uranyl nitrate chloride complexes. Related structures of mixed-ligand uranyl halides are compared.

Synthese und Kristallstruktur von Dibariumzink-bis(cyclotriborat) Ba2Zn(B3O6)2/Synthesis and Crystal Structure of Di-barium Zinc Bis-cyclotriborate Ba2Zn(B3O6)2

1996 ◽  
Vol 51 (3) ◽  
pp. 309-312 ◽  
Author(s):  
Silke Busche ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Single Crystals ◽  
Crystal Structures ◽  
Structure Type ◽  
Lattice Parameters ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Unknown Structure

Abstract Single crystals of the new compound Ba2Zn(B3O6)2 were obtained by using a B2O3 flux technique. They crystallize in an as yet unknown structure type. X-ray investigations led to space group Ci1-P1̄ (Nr.2) with lattice parameters a = 715.5(2), b = 720.5(2), c = 1178.9(4), a = 78.96(2)°, β = 85.45(2)°, γ = 60.12(1)°, Z = 2. The structure is characterized by iso­lated (B3O6)3--rings and contains two ninefold coordinated Ba-sites. Zn2+ is tetrahedrally coordinated by oxygen. The relation to the crystal structures of high-temperature BaB2O4 and Ba2Ca(B3O6)2 is discussed.

scholarly journals Synthesis and crystal structure of ABW-type SrFe1.40V0.60O4

2020 ◽  
Vol 76 (5) ◽  
pp. 664-667
Author(s):  
Thomas Gstir ◽  
Volker Kahlenberg ◽  
Hannes Krüger ◽  
Simon Penner
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Three Dimensional ◽  
Charge Compensation ◽  
Membered Ring ◽  
Side Product ◽  
Double Perovskites ◽  
Tetrahedral Framework ◽  
Synthesis And Crystal Structure ◽  
Zeolite Type

Single crystals of SrFe1.40V0.60O4, strontium tetraoxidodi[ferrate(III)/vanadate(III)], have been obtained as a side product in the course of sinter experiments aimed at the synthesis of double perovskites in the system SrO–Fe2O3–V2O5. The crystal structure can be characterized by layers of six-membered rings of TO4-tetrahedra (T: FeIII, VIII) perpendicular to [100]. Stacking of the layers along [100] results in a three-dimensional framework enclosing tunnel-like cavities in which SrII cations are incorporated for charge compensation. The sequence of directedness of up (U) and down (D) pointing vertices of neighboring tetrahedra in a single six-membered ring is UUUDDD. The topology of the tetrahedral framework belongs to the zeolite-type ABW.

scholarly journals Synthesis and crystal structure of calcium dizinc iron(III) tris(orthophosphate), CaZn2Fe(PO4)3

2016 ◽  
Vol 72 (9) ◽  
pp. 1260-1262 ◽  
Author(s):  
Jamal Khmiyas ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Three Dimensional ◽  
Asymmetric Unit ◽  
Common Edge ◽  
Conventional Solid State Reaction ◽  
Synthesis And Crystal Structure ◽  
A Chain

Single crystals of the title compound, CaZn2Fe(PO4)3, were synthesized by conventional solid-state reaction. In the asymmetric unit, all atoms are located in fully occupied general positions of theP21/cspace group. The zinc atoms are located on two crystallographically independent sites with tetrahedral and distorted triangular-based bipyramidal geometries. Two edge-sharing triangular bipyramidal ZnO5units form a dimer, which is linked to slightly deformed FeO6octahedraviaa common edge. The resulting chains are interconnected through PO4tetrahedra to form a layer perpendicular to thebaxis. Moreover, the remaining PO4and ZnO4tetrahedra are linked together through common vertices to form tapes parallel to thecaxis and surrounding a chain of Ca2+cations to build a sheet, also perpendicular to thebaxis. The stacking of the two layers along thebaxis leads to the resulting three-dimensional framework, which defines channels in which the Ca2+cations are located, each cation being coordinated by seven oxygen atoms.

scholarly journals High-pressure synthesis and crystal structure of SrGa4As4

2019 ◽  
Vol 75 (11) ◽  
pp. 1643-1645
Author(s):  
Valentin Weippert ◽  
Dirk Johrendt
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rotation Axis ◽  
Three Dimensional ◽  
Structure Type ◽  
Synthesis And Crystal Structure ◽  
High Pressure High Temperature ◽  
Wyckoff Position ◽  
Pressure Synthesis ◽  
3D Framework

Strontium tetragallate(II,III) tetraarsenide, SrGa4As4, was synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 8 GPa and 1573 K. The compound crystallizes in a new structure type (P3221, Z = 3) as a three-dimensional (3D) framework of corner-sharing SrAs8 quadratic antiprisms with strontium situated on a twofold rotation axis (Wyckoff position 3b). This arrangement is surrounded by a 3D framework which can be described as alternately stacked layers of either condensed GaIIIAs4 tetrahedra or honeycomb-like layers built up from distorted ethane-like GaII 2As6 units comprising Ga—Ga bonds.

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