In this study, the evolution of color with composition and temperature will be explained by structural characterization MgCoxNi1-xSiO4(1), Na2CoxNi1-xSi4O10 Na2Mg1-xCoxSiO4 (0.0 ≤ x 1.0) in which olivine structure is developedand CaMg0.5CoxNi0.5-xSi2O6 (0 0.5) diopside structure(2) fired materials. These compositions were prepared via chemical co-precipitation method to minimise toxic expensive amounts cobalt nickel. The colour these materials are pink from MgCoxNi1-xSiO4 solid solutions or...

Crystalline α-zirconium phosphate, Zr(HPO4)2·H2O, was obtained by direct precipitation of soluble salts zirconium(IV) with phosphoric acid. The fresh compound transforms, hydrolysis, into amorphous or semicrystalline hydroxophosphates a P/Zr molar ratio less than two. These facts contradict the formation mechanism zirconium phosphates admitted researchers for over more 40 years. materials are characterized chemical, textural, and thermal analysis, powder X-ray diffraction, scanning electron...

Microcrystals of (NH4)2Ce(PO4)2·H2O were hydrothermally obtained from a CeO2−CO(NH2)2−H3PO4−H2O system (T = 180 °C). The structure [orthorhombic, Imma, 6.8940(9), b 6.8860(9), c 17.723(2) Å] consists CeO8 distorted dodecahedra and PO4 tetrahedra joined together to form three-dimensional framework with small four-sided larger six-sided tunnels in quasi-equivalent directions. Ammonium ions water molecules are situated inside the tunnels. Also, thermal decomposition is discussed.

α-Ti(HPO4)2·H2O (α-TiP) and its propylamine intercalation product, Ti(HPO4)2·2C3H7NH2·H2O (α-TiPPr), have been synthesized characterized. Later, their sorption capacity for europium(III) was investigated, this purpose accomplished by treating α-TiP α-TiPPr with nitrate solutions at different concentrations until the equilibrium is reached. All samples were characterized, among others, powder X-ray diffraction (PXRD), scanning transmission electron microscopies (SEM, TEM, STEM-EDX, SAED),...

The simultaneous intercalation of two or more n-alkylamines into α-titanium phosphate, Ti(HPO4)2·H2O, has been investigated. large n-alkylamine molecules observed to be faster if there is a shorter alkyl chain amine, acting as catalyst, yielding at completion single amine intercalates. New individual phases containing different amines are obtained. In the case vapor mixture several (CnH2n+1NH2, n = 2−8), compound obtained depends on reaction time, providing selectivity. morphology and...

Abstract NH 4 [Co 1− y Ni PO ]·H 2 O (0 ≤ 1) single crystals were fired to prepare Co 2− x P 7 0 solid solutions between 800 and 1200°C. The structure of these is α‐M (M = Co, Ni). contraction the unit cell with increasing confirmed formation solutions. UV–vis–NIR spectra consistent Co( II ) Ni( ions in two different crystallographic sites (octahedral site square pyramidal site) structure. Due their thermal stability, 2) can be used as a blue, green, brown or yellow ceramic pigment.

NH4Fe(HPO4)2 and its deuterated form have been synthesized as monophasic polycrystalline materials. Their crystal structures, including hydrogen positions, were determined by Rietveld refinement Fourier synthesis using constant-wavelength neutron powder diffraction data. In addition, the thermal decomposition of was found to give mixtures Fe4(P2O7)3 Fe(PO3)3via NH4FeP2O7 formation, structure which has also refined from X-ray

The structure of π-Ti₂O(PO₄)₂·2H₂O was determined by the SR-PXRD method. proton conductivity chitosan/π-TiP membranes reached 4.5 × 10⁻³ S cm⁻¹ at 95%-RH.

Microcrystals of the first ammonium-thorium phosphates, (NH 4) 2Th(PO 2.H 2O (tetragonal, I4 1/ amd, a = 7.0192(4) A, c 17.9403(8) A) and NH 4Th 2(PO 3 (monoclinic, C2/ c, 17.880(6) b 6.906(1) 8.152(2) beta 104.39(2) degrees ) were hydrothermally obtained from Th(NO 3) 4-CO(NH 2) 2-H 3PO 3-H system ( T 180 C). In both cases, structure consists three-dimensional framework with PO 4 tetrahedra coordinated to Th atoms (ThO n polyhedra, where 8 or 9, for tetragonal monoclinic phase,...

Iron(III) phosphates have been synthesized directly under mild hydrothermal conditions. The reaction of FeCl3, H3PO4 and (NH2)2CO aqueous solutions at 180 °C leads to the formation four individual compounds: FePO4·2H2O, Fe(NH4)(HPO4)2, Fe2(NH4)(OH)(PO4)2·2H2O Fe(NH3)2PO4. product depends on Fe∶P∶C molar ratio in mixture. effect urea route is discussed.

Th(2)(PO(4))(2)(HPO(4)).H(2)O was synthesized under wet hydrothermal conditions starting from a mixture of H(3)PO(3) and Th(NO(3))(4).5H(2)O. The crystal structure solved by powder X-ray diffraction data. unit cell parameters are = 6.7023(8) Angstroms, b 7.0150(8) c 11.184(1) beta 107.242(4) degrees, space group P2(1), Z 2. consists layers both thorium atoms PO(4) groups, alternating with layer formed HPO(4) entities water molecules. By thermal treatment, this compound turns into...

There is an increasing demand on synthesizing pharmaceuticals and biomaterials that possess antimicrobial and/or antiviral activities. In this respective silver nanoparticles are known for their excellent activity. Nevertheless, uncontrolled release in a biological medium can induce cytotoxic effect. For this, we explored the use of nanolayered metal phosphates based titanium zirconium as materials be enriched with nanoparticles. Employing hydrothermal route, crystalline α-phases (α-ZrP,...

A portable powder-liquid high-corrosion-resistant reaction cell has been designed to follow in situ reactions by X-ray powder diffraction (XRD) and absorption spectroscopy (XAS) techniques. The conceived be mounted on the experimental stations for of Spanish CRG SpLine-BM25 beamline at European Synchrotron Radiation Facility. Powder reactants and/or products are kept a fixed position vertical geometry pathway porous membrane, under forced liquid reflux circulation. Owing short beam through...

This study considers the limitations of cobalt violet orthophosphate, Co3P2O8, in ceramic industry due to its large amount cobalt. MgxCo3-xP2O8 (0 ≤ x 3) solid solutions with stable Co3P2O8 structure were synthesised via chemical coprecipitation method. The formation between isostructural and Mg3P2O8 compounds decreased toxically this inorganic pigment increased melting point a temperature higher than 1200 °C when ≥ 1.5. melted at 1160 °C, compositions 1.5 800 °C. substitution Co(II) Mg(II)...

The reaction between natural phlogopite, having the idealized formula KMg3(AlSi3O10)(OH)2, and phenylphosphonic acid under soft conditions (24 h, 80 °C, reflux) originated a new layered material of following composition: [Mg(H2O)2]0.5(AlSi3O6)(O3PC6H5)2·2H2O. mechanism involves rupture trioctahedral layers phlogopite formation basal spacing hydrophobic type that is occupied by groups in pseudomonomolecular arrangement. Simultaneously, mobile K+ ions become partially substituted [Mg(H2O)2]2+...

Microcrystals of Th(HPO 4) 2.H 2O were hydrothermally obtained from a Th(NO 3) 4-CO(NH 2) 2-H 3PO 3-H system ( T = 180 masculineC). The structure [orthorhombic, Pbca, 9.1968(2) A, b 18.6382(2) c 8.7871(2) A], unlike alpha-Zr(HPO 2O-type layered compounds, consists three-dimensional framework with PO 4 tetrahedra coordinated to Th atoms. water molecule is also the atom and projected toward small channels running along directions axes. ThO 6O(w) environment could be described as highly...

Combining neutron diffraction, magnetization measurements up to 330 kOe and specific-heat data, we have studied in detail both the crystal magnetic structures of triclinic ${\text{ND}}_{4}\text{Fe}{({\text{DPO}}_{4})}_{2}$ ${\text{NH}}_{4}\text{Fe}{({\text{HPO}}_{4})}_{2}$ compounds. The low symmetry this structure gives rise a complex pattern competing superexchange interactions between moments two types ${\text{Fe}}^{3+}$ sites (with different site symmetry) that are responsible for...

Fe(NH3)2PO4 is synthesized under mild hydrothermal conditions in the presence of urea. The crystal structure solved for powder X-ray diffraction data. unit cell orthorhombic, a = 10.1058(2) Å, b 6.3676(2) c 7.5714(2) space group Pnma, Z 4. consists three-dimensional network FeO4N2 octahedra and PO4 tetrahedra linked by vertex sharing. Two crystallographically independent ammonia molecules are to iron atom. This compound first solid structurally characterized containing Fe−NH3 bonds.