Crystalline zirconium(IV) hydrogenarsenate hydrogenphosphate monohydrate: synthesis, ion-exchange properties, and thermal behaviour

Berardelli, M. L.; Galli, P.; Ginestra, A. La; Massucci, M. A.; Varshney, K. G.

doi:10.1039/dt9850001737

Cited by 13 publications

(5 citation statements)

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“…compounds containing two different cations and a given anion or two different anions and a cation, are interesting since they exhibit improved properties in comparison to their single salt counterparts [32,33]. Mixed materials have been widely investigated and exhibit improved ion exchange characteristics compared to their single salt counterparts [34][35][36][37]. From our laboratory, mixed material containing two anions and a cation, zirconium phosphomolybdate, has been synthesized, characterized and their proton conduction properties compared with single salt counter parts, zirconium phosphate and zirconium molybdate [38].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and proton transport properties of a mixed material—Zirconium titanium phosphate, a tetravalent bimetallic acid salt

Thakkar

Chudasama

2009

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and proton transport properties of a mixed material—Zirconium titanium phosphate, a tetravalent bimetallic acid salt

Thakkar

Chudasama

2009

Electrochimica Acta

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“…Lamellar materials feature a number of important and interesting properties, due to the qualities induced to them by the addition of guest components placed within the interlayer spacing. Among the main properties shown by these materials, we can mention the following: [1][2][3] (a) these solids can host a variety of molecules in-between their interlayer spacing; (b) these substrates have the ability to exchange ions; (c) these substances can vary their internal chemical composition; (d) the surface layer of these materials can present considerable chemical activity; and (e) the lamellar structure of these substrates can undergo reversible swelling.…”

Section: Introductionmentioning

confidence: 99%

On the textural and morphological properties of crystalline and amorphous α-tin phosphate

Velásquez

Rojas

Lara

et al. 2004

Phys. Chem. Chem. Phys.

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The synthesis as well as the textural and morphological properties of microporous amorphous and crystalline tin(IV) phosphate, Sn(HPO 4 ) 2 Á H 2 O (a-SnP), prepared by the sol-gel technique are presented. Tin tetra-tertamyloxide, Sn(OAm t ) 4, is first synthesized and a solution of this reactant in tert-amyl alcohol reacts with orthophosphoric acid to obtain in due course both the amorphous and the crystalline a-SnP forms. The N 2 sorption isotherm of the crystalline powder attains a hysteresis cycle proper of lamellar void structures over a long interval of relative pressures. The differential t-plot of this isotherm reveals the presence of two kinds of supermicropores: (i) a group of narrow slit-like pores with interlamellar void maxima arising at 0.712 nm, 0.774 nm, and 0.828 nm (these values suggest that the primary micropore filling of the interlayer space occurs with at most two layers of N 2 indicating likewise the non-rigid character of the plates that are delimiting each slit-like pore), (ii) a second microporous contribution that involves the cooperative micropore filling of wider slit-like pores having widths in the interval 1.01-1.57 nm. The narrow supermicropores are formed by the interlamellar spacing between a pair of elementary a-Sn-P sheets, while the wider micropores are delimited by solid plates that may be built by the parallel stacking of several elementary sheets of a-Sn-P. BET and t surface areas of the a-SnP specimen both correspond to 20.2 m 2 g À1 , therefore confirming adsorption on flat surfaces and the absence of voids other than supermicropores. Application of Bragg's equation to the X-ray diffraction pattern of the a-SnP sample renders an elementary interlayer distance of 0.80 nm that compares well with the theoretical 0.78 nm value. NMR spectra depict sharp crystalline peaks at À11.9 and À12.1 ppm for the amorphous and crystalline forms, respectively. SAXS measurements render crystallite sizes between 4 and 32 nm for the amorphous and crystalline forms. Crystalline a-SnP also depicts a wide-ranging fractal structure; this fact is confirmed by the consistent values of the surface fractal dimension obtained from application of the Neimark-Kiselev sorption approach over a long range of relative pressures.

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“…Elbrahimi et al (1990) prepared and characterized by single crystal XRD the composition KZr 2 As 3 0i 2 in the space group R3c and with nasicon structure, however the XRD powder patterns were not measured or reported. Berardelli et al (1985) prepared by a wet chemical route KZr 2 AS[ 5 Pj 5 O 12 whose XRD powder intensities were later collected as PDF-37-0298 (McClune, 1985). The patterns were however unindexed as the same author did not recognize the nasicon structure for this phase.…”

Section: Introductionmentioning

confidence: 99%

Powder diffraction study of arsenic-substituted nasicon structures MeZr₂As_(3−x)P_xO₁₂ (Me=Na⁺, K⁺)

1998

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Three new mixed oxides having the nasicon structure and containing arsenic(V) as tetrahedral ion were prepared and X-ray analyzed. The stoichiometry of the three phases can be expressed by the comprehensive notation MeZr2As(3−x)PxO12 where Me stands for Na+ or K+, x equals to 0 and 1.5 when Me=Na, while x equals to 1.5 when Me=K. For two other compositions of the above series, the powder patterns were calculated on the basis of the structural data from single crystal determinations, thus permitting us to complete the characterization of the solids, with nasicon framework, deriving from MeZr2P3O12 (Me=Na+, K+) by partial (50%) or complete (100%) substitution of As for P.Key words: nasicon, ionic conductors, phosphates, arsenates

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Crystalline zirconium(IV) hydrogenarsenate hydrogenphosphate monohydrate: synthesis, ion-exchange properties, and thermal behaviour

Cited by 13 publications

References 1 publication

Synthesis, characterization and proton transport properties of a mixed material—Zirconium titanium phosphate, a tetravalent bimetallic acid salt

Synthesis, characterization and proton transport properties of a mixed material—Zirconium titanium phosphate, a tetravalent bimetallic acid salt

On the textural and morphological properties of crystalline and amorphous α-tin phosphate

Powder diffraction study of arsenic-substituted nasicon structures MeZr₂As_(3−x)P_xO₁₂ (Me=Na⁺, K⁺)

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Crystalline zirconium(IV) hydrogenarsenate hydrogenphosphate monohydrate: synthesis, ion-exchange properties, and thermal behaviour

Cited by 13 publications

References 1 publication

Synthesis, characterization and proton transport properties of a mixed material—Zirconium titanium phosphate, a tetravalent bimetallic acid salt

Synthesis, characterization and proton transport properties of a mixed material—Zirconium titanium phosphate, a tetravalent bimetallic acid salt

On the textural and morphological properties of crystalline and amorphous α-tin phosphate

Powder diffraction study of arsenic-substituted nasicon structures MeZr2As(3−x)PxO12 (Me=Na+, K+)

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Powder diffraction study of arsenic-substituted nasicon structures MeZr₂As_(3−x)P_xO₁₂ (Me=Na⁺, K⁺)