Structural Characterization of the High-Temperature Phase Transitions in Ca8[Al12O24](MoO4)2Aluminate Sodalite Using X-ray Powder Diffraction

Smaalen, Sander van; Dinnebiér, Robert E.; Katzke, Hannelore; Depmeier, Wulf

doi:10.1006/jssc.1996.7251

Cited by 25 publications

(4 citation statements)

References 14 publications

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“…The general formula for a hauyne is thus written M 2ϩ 2 M ϩ 6 [ABO 4 ] 6 (XO 4 ) 2 , where M includes Ca, 35 Sr, Cd, Mn and Pb 40 and X includes S, Mo, W and Cr. 41 The filling of only alternate cages obviously produces a different array of trapped inorganic species yielding a new set of interactions between the centres, Fig. 3.…”

Section: Sodalitesmentioning

confidence: 99%

Where zeolites and oxides merge: semi-condensed tetrahedral frameworks

Weller

2000

J. Chem. Soc., Dalton Trans.

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Section: Sodalitesmentioning

confidence: 99%

Where zeolites and oxides merge: semi-condensed tetrahedral frameworks

Weller

2000

J. Chem. Soc., Dalton Trans.

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“…This supercell setting has been observed recently in anion-ordered Ca 8 ͓Al 12 O 24 ͔͑MO 4 ) 2 sodalite. 18 The fits to the background included a 15-segment reciprocal interpolation function ͑GSAS background function #8͒ added to a fixed 20-segment linear interpolation function. FIG.…”

Section: B Peak Splittingmentioning

confidence: 99%

The cation-vacancy ordering transition in dehydrated Na6 sodalite

Campbell

Delgado

Cheetham

et al. 2000

The Journal of Chemical Physics

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Variable-temperature synchrotron x-ray powder diffraction data from dehydrated Na 6 ͓Al 6 Si 6 O 24 ] reveal a structural phase transition that involves both the commensurate ordering of the extra-framework Na cations and a one-dimensional incommensurate modulation of the framework. Peak splittings and superlattice reflections implicate an orthorhombically-distorted volume-doubled supercell at room temperature ͑aϭ12.9432 Å, bϭ12.8403 Å, and cϭ9.1372 Å͒ ϳ(&aϫ&a ϫa). These data also included additional superlattice peaks associated with an incommensurate long-period modulation with ϭ͑3/2 1/2 1͒/8.9. All unique orderings of the 12 Na cations among the 16 available sites of the commensurate supercell are enumerated. A unique solution is identified that minimizes the structural energy and accounts for the observed superlattice peaks. Rietveld analysis reveals a significant Pauling ''partial-collapse'' tilt angle in the cation-ordered phase, that appears to decrease with increasing temperature.

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“…CSAM‐16 is an aluminate sodalite‐type oxide with a crystal structure that comprises a three‐dimensional framework of AlO 4 tetrahedra (inset of Fig. ) . In CSAM‐16, mutually nonequivalent voids in the framework are filled by MoO 4 2− complex anions and Ca 2+ (Sr 2+ ) cations, where the Ca 2+ ‐to‐Sr 2+ ratio is 84:16.…”

Section: Resultsmentioning

confidence: 99%

Improper ferroelectrics as high‐efficiency energy conversion materials

Wakamatsu

Tanabe

Terasaki

et al. 2017

Physica Rapid Research Ltrs

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An improper ferroelectric is a certain type of ferroelectrics whose primary order parameter is not polarization but another physical quantity such as magnetization. In contrast to a conventional proper ferroelectrics as represented by Pb(Zr,Ti)O3 and BaTiO3, the improper ferroelectrics has been inconceivable for practical applications thus far. Herein, we illustrate the great potential of improper ferroelectrics for efficient conversion of temperature fluctuation to electric energy, as demonstrated with (Ca0.84Sr0.16)8[AlO2]12(MoO4)2 (CSAM‐16). The present study has experimentally proven that CSAM‐16 achieves an excellent electrothermal coupling factor and high electric field sensitivity for pyroelectric energy conversion that approach a practical level for application to self‐powered autonomous electronic devices for rapidly spreading wireless sensor networks. The present results provide a novel approach to developing innovative pyroelectric energy harvesting devices using improper ferroelectrics.

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Structural Characterization of the High-Temperature Phase Transitions in Ca8[Al12O24](MoO4)2Aluminate Sodalite Using X-ray Powder Diffraction

Cited by 25 publications

References 14 publications

Where zeolites and oxides merge: semi-condensed tetrahedral frameworks

Where zeolites and oxides merge: semi-condensed tetrahedral frameworks

The cation-vacancy ordering transition in dehydrated Na6 sodalite

Improper ferroelectrics as high‐efficiency energy conversion materials

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