scholarly journals Rietveld refinement of the langbeinite-type phosphate K2Ni0.5Hf1.5(PO4)3

2020 ◽  
Vol 76 (10) ◽  
pp. 1634-1637
Author(s):  
Liang Zhou ◽  
Denys S. Butenko ◽  
Ivan V. Ogorodnyk ◽  
Nickolai I. Klyui ◽  
Igor V. Zatovsky
Keyword(s):  
Solid State ◽  
Rietveld Refinement ◽  
Title Compound ◽  
Three Dimensional ◽  
Solid State Method ◽  
Coordination Numbers ◽  
Rotation Axes ◽  
State Method

Polycrystalline potassium nickel(II) hafnium(IV) tris(orthophosphate), a langbeinite-type phosphate, was synthesized by a solid-state method. The three-dimensional framework of the title compound is built up from two types of [MO6] octahedra [the M sites are occupied by Hf:Ni in ratios of 0.754 (8):0.246 (8) and 0.746 (8):0.254 (8), respectively] and [PO4] tetrahedra are connected via O vertices. The K+ cations are located in two positions within large cavities of the framework, having coordination numbers of 9 and 12. The Hf, Ni and K sites lie on threefold rotation axes, while the P and O atoms are situated in general positions.

scholarly journals Ca5Zr3F22

2012 ◽  
Vol 68 (4) ◽  
pp. i23-i23 ◽  
Author(s):  
Abdelghani Oudahmane ◽  
Malika El-Ghozzi ◽  
Daniel Avignant
Keyword(s):  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Title Compound ◽  
Three Dimensional ◽  
The Other ◽  
Site Symmetry ◽  
Coordination Numbers ◽  
Rotation Axes ◽  
Dimensional Network

Single crystals of Ca5Zr3F22, pentacalcium trizirconium docosafluoride, were obtained unexpectedly by solid-state reaction between CaF2and ZrF4in the presence of AgF. The structure of the title compound is isotypic with that of Sr5Zr3F22and can be described as being composed of layers with composition [Zr3F20]8−made up from two different [ZrF8]4−square antiprisms (one with site symmetry 2) by corner-sharing. The layers extending parallel to the (001) plane are further linked by Ca2+cations, forming a three-dimensional network. Amongst the four crystallographically different Ca2+ions, three are located on twofold rotation axes. The Ca2+ions exhibit coordination numbers ranging from 8 to 12, depending on the cut off, with very distorted fluorine environments. Two of the Ca2+ions occupy interstices between the layers whereas the other two are located in void spaces of the [Zr3F20]8−layer and alternate with the two Zr atoms along [010]. The crystal under investigation was an inversion twin.

The double molybdate Na9Sc(MoO4)6refined from powder XRD data

2013 ◽  
Vol 69 (11) ◽  
pp. 1301-1303 ◽  
Author(s):  
Aleksandra A. Savina ◽  
Vladimir A. Morozov ◽  
Olga M. Basovich ◽  
Elena G. Khaikina ◽  
Bogdan I. Lazoryak
Keyword(s):  
Solid State ◽  
Three Dimensional ◽  
Basic Structure ◽  
Powder Xrd ◽  
The Other ◽  
Double Molybdate ◽  
Solid State Method ◽  
State Method

Na9Sc(MoO4)6{nonasodium scandium hexakis[tetraoxidomolybdate(II)]} was synthesised by a solid-state method. The basic structure units are polyhedral clusters composed of an ScO6octahedron and three NaO6octahedra sharing total edges. The clusters are connected by sharing vertices with bridging MoO4tetrahedra, forming a three-dimensional framework where the cavities are occupied by the other two crystallographically independent Na atoms.

Three dimensional composites of graphene as supports in Pd-catalyzed synthetic applications

2019 ◽  
Vol 4 (1) ◽  
pp. 90-99 ◽  
Author(s):  
Yuan Yang ◽  
Stanly E. Gilliland ◽  
Sajjad Ghobadi ◽  
Michael Burkholder ◽  
Sarah E. Smith ◽  
...  
Keyword(s):  
Solid State ◽  
Suzuki Reaction ◽  
Three Dimensional ◽  
Pd Catalyst ◽  
Solid State Method ◽  
Highly Active ◽  
State Method

A facile solid-state method to synthesize a highly active and recyclable Pd catalyst of 3D supports made of Ni, G and, CNTs for Suzuki reaction and C–H activation is presented.

Synthesis and porous h-BN 3D architectures for effective humidity and gas sensors

RSC Advances ◽  
2016 ◽  
Vol 6 (91) ◽  
pp. 87888-87896 ◽  
Author(s):  
Chandkiram Gautam ◽  
Chandra Sekhar Tiwary ◽  
Leonardo D. Machado ◽  
Sujin Jose ◽  
Sehmus Ozden ◽  
...  
Keyword(s):  
Solid State ◽  
Gas Sensors ◽  
Three Dimensional ◽  
Interconnected Network ◽  
Solid State Method ◽  
Boron Trioxide ◽  
State Method

3D (three dimensional) architectures synthesised using an easily scalable solid state method which results in an interconnected network of porous h-BN sheets with boron trioxide are reported in this study.

scholarly journals Rietveld refinement of the langbeinite-type mixed-metal phosphate K2Ni0.5Zr1.5(PO4)3

2014 ◽  
Vol 70 (7) ◽  
pp. i41-i41 ◽  
Author(s):  
Igor V. Zatovsky
Keyword(s):  
Rietveld Refinement ◽  
Title Compound ◽  
Metal Phosphate ◽  
Mixed Metal ◽  
Coordination Numbers ◽  
Rotation Axes

Dipotassium [nickel(II) zirconium(IV)] tris(orthophosphate) was prepared from a self-flux in the system K2O–P2O5–NiO–K2ZrF6. The title compound belongs to the langbeinite family and is built up from two [MO6] octahedra [M= Ni:Zr with mixed occupancy in ratios of 0.21 (4):0.79 (4) and 0.29 (4):0.71 (4), respectively] and [PO4] tetrahedra interlinkedviavertices into a3∞[M2(PO4)3] framework. Two independent K+cations are located in large cavities of the framework, with coordination numbers to O2−anions of nine and twelve. The K, Ni, and Zr sites are located on threefold rotation axes.

scholarly journals Non-centrosymmetric Rb2Mn2(MoO4)3

2014 ◽  
Vol 70 (7) ◽  
pp. i36-i37 ◽  
Author(s):  
Chahira Bouzidi ◽  
Mohamed Faouzi Zid ◽  
Ahmed Driss ◽  
Amira Souilem
Keyword(s):  
Solid State ◽  
Title Compound ◽  
Three Dimensional ◽  
Solid State Reactions ◽  
Structural Description ◽  
Rotation Axes

The title compound, dirubidium dimanganese(II) tris(tetraoxomolybdate), Rb2Mn2(MoO4)3, was prepared by solid-state reactions. The structure can be described as being composed of MnO6octahedra sharing corners with MoO4tetrahedra. The three-dimensional framework contains cavities in which the rubidium ions are located. The Rb+cations are within distorted nine- and 12-vertex polyhedra. The pairs of different Mn2+and Rb+cations are each located on threefold rotation axes.. Rb2Mn2(MoO4)3is isotypic with compounds of the Cs2M2Mo3O12(M= Ni, Fe) family. A comparative structural description is provided between the structure of the title compound and those of related phases. Differences with structures such as alluaudite are discussed.

scholarly journals Crystal structure of disilver(I) dizinc(II) iron(III) tris(orthovanadate) with an alluaudite-type structure

2018 ◽  
Vol 74 (8) ◽  
pp. 1155-1158 ◽  
Author(s):  
Nour El Houda Lamsakhar ◽  
Mohammed Zriouil ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Title Compound ◽  
General Position ◽  
Three Dimensional ◽  
Type Structure ◽  
Solid State Reactions ◽  
Framework Structure ◽  
Rotation Axes ◽  
Wyckoff Position

The title compound, Ag2Zn2Fe(VO4)3, has been synthesized by solid-state reactions and belongs to the alluaudite structure family. In the crystal structure, four sites are positioned at special positions. One silver site is located on an inversion centre (Wyckoff position 4b), and an additional silver site, as well as one zinc and one vanadium site, on twofold rotation axes (4e). One site on a general position is statistically occupied by FeIII and ZnII cations that are octahedrally surrounded by O atoms. The three-dimensional framework structure of the title vanadate results from [(Zn,Fe)2O10] units of edge-sharing [(Zn,Fe)O6] octahedra that alternate with [ZnO6] octahedra so as to form infinite chains parallel to [10\overline{1}]. These chains are linked through VO4 tetrahedra by sharing vertices, giving rise to layers extending parallel to (010). Such layers are shared by common vanadate tetrahedra. The resulting three-dimensional framework delimits two types of channels parallel to [001] in which the silver sites are located with four- and sixfold coordination by oxygen.

scholarly journals More superior pyroelectric performance of synthesized dravite by high-pressure solid-state method

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035304
Author(s):  
You Shan ◽  
Guojun Zhou ◽  
Kairen Chen ◽  
Changchun Zhao ◽  
Kun Shen ◽  
...  
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Solid State Method ◽  
State Method
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