A molecular composite between partially hydrolyzed aluminum cations and a layered calcium niobate perovskite

Hardin, Simon G.; Hay, D. Robert; Millikan, Mary; Sanders, J. V.; Turney, Terence W.

doi:10.1021/cm00017a038

Cited by 32 publications

(15 citation statements)

References 5 publications

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“…Another recent single-crystal 93 Nb NMR study involved measurements of the 93 Nb EFG parameters in Nb-doped single TiO 2 crystals [266]. 93 Nb and 27 Al NMR studies of composites between partially hydrolyzed aluminum cations and layered calcium niobate perovskites suggest the presence of structurally unaltered Ca 2 Nb 3 O 10 layers in these materials with interlayer regions occupied by polymeric Al hydroxylcations [36].…”

Section: Miscellaneous Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Practical aspects of 51V and 93Nb solid-state NMR spectroscopy and applications to oxide materials

Lapina

Khabibulin

Shubin

et al. 2008

Progress in Nuclear Magnetic Resonance Spectroscopy

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Section: Miscellaneous Applicationsmentioning

confidence: 99%

“…In a solid the electric field gradients arising from the electronic cloud at the nucleus can interact with the nuclear quadrupolar giving rise to considerable spectral broadening. Nevertheless, several Nb-containing systems were studied in detail using combined static and conventional MAS 93 Nb NMR [35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Practical aspects of 51V and 93Nb solid-state NMR spectroscopy and applications to oxide materials

Lapina

Khabibulin

Shubin

et al. 2008

Progress in Nuclear Magnetic Resonance Spectroscopy

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“…Furthermore, the pancake-shaped Fe O nanoclusters would stu! the interlayer region (15), removing the free spaces between the niobate layers. As can be seen from Fig.…”

Section: Nitrogen Adsorption}desorption Isothermmentioning

confidence: 99%

Pillaring of Layered Perovskites, K1−La Ca2−Nb3O10, with Nanosized Fe2O3 Particles

Han

Choi

Jang

et al. 2001

Journal of Solid State Chemistry

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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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A molecular composite between partially hydrolyzed aluminum cations and a layered calcium niobate perovskite

Cited by 32 publications

References 5 publications

Practical aspects of 51V and 93Nb solid-state NMR spectroscopy and applications to oxide materials

Practical aspects of 51V and 93Nb solid-state NMR spectroscopy and applications to oxide materials

Pillaring of Layered Perovskites, K1−La Ca2−Nb3O10, with Nanosized Fe2O3 Particles

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

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