Solid-phase dissolution of iron acetylacetonate in a matrix of hydrated serum albumin

Gusakovskaya, I. G.; Medvedeva, N. V.; Ovanesyan, N. S.; Pirumova, S. I.; Trukhtanov, V. A.; Khurgin, Yu. I.

doi:10.1007/bf00952500

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“…There is general agreement that it is necessary to have mobile cations partially distributed over several sites and that stoichiometric materials are comparatively much poorer ionic conductors. However, it is often difficult to compare reported data as it is common to find discrepancies in the conductivities for a given phase depending upon a number of factors: (1) preparation method, (2) thermal history, (3) true bulk stoichiometry, (4) sintering processes, and hence (5) possible influence of grain-boundary effects. Due to these factors, it appears that some degree of nonreproducibility is unavoidable and should be kept in mind when comparing results of different authors.…”

Section: Introductionmentioning

confidence: 99%

Understanding Na Mobility in NASICON Materials: A Rietveld, ²³Na and ³¹P MAS NMR, and Impedance Study

Losilla¹,

Aranda²,

Bruque³

et al. 1998

Chem. Mater.

112

109

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The structures and electrical properties of four NASICON compositions, Na1.4M1.6In0.4(PO4)3 (M = Ti, Sn, Hf, Zr), have been determined and compared. Rietveld refinement of powder X-ray diffraction data confirmed the basic rhombohedral NASICON structure with random occupancy of the octahedral In/M sites, full occupancy of the Na(1) sites and partial occupancy of the Na(2) sites. For three compositions, M = Zr, Sn, and Hf, the 31P MAS NMR peak intensities of the four detected signals, attributed to four different phosphorus environments [P(OM)4 - n (OIn) n (n = 0−3)], were close to the ratios expected for a random distribution of In/M. For M = Ti, some departures from statistical occupancy were apparent. 23Na MAS NMR data gave evidence for two Na+ positions at room temperature for M = Ti, Sn, attributable to occupation of Na(1) and Na(2) sites. For M = Hf, Zr, only a single signal could be resolved at room temperature, which splits into two signals on cooling to − 50 °C, indicating high Na mobility at room temperature. Impedance data obtained on pressed sintered pellets over the range 25−300 °C showed that bulk ionic conductivities increased and activation energies decreased in the sequence Ti, Sn, Hf, Zr. The geometry of the M1M2 bottleneck has been determined from structural data, and a direct correlation found between activation energy for ion conduction and the bottleneck size.

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Section: Introductionmentioning

confidence: 99%

Understanding Na Mobility in NASICON Materials: A Rietveld, ²³Na and ³¹P MAS NMR, and Impedance Study

Losilla¹,

Aranda²,

Bruque³

et al. 1998

Chem. Mater.

112

109

View full text Add to dashboard Cite

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Solid-phase dissolution of iron acetylacetonate in a matrix of hydrated serum albumin

Cited by 1 publication

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Understanding Na Mobility in NASICON Materials: A Rietveld, ²³Na and ³¹P MAS NMR, and Impedance Study

Understanding Na Mobility in NASICON Materials: A Rietveld, ²³Na and ³¹P MAS NMR, and Impedance Study

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Solid-phase dissolution of iron acetylacetonate in a matrix of hydrated serum albumin

Cited by 1 publication

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Understanding Na Mobility in NASICON Materials: A Rietveld, 23Na and 31P MAS NMR, and Impedance Study

Understanding Na Mobility in NASICON Materials: A Rietveld, 23Na and 31P MAS NMR, and Impedance Study

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Understanding Na Mobility in NASICON Materials: A Rietveld, ²³Na and ³¹P MAS NMR, and Impedance Study

Understanding Na Mobility in NASICON Materials: A Rietveld, ²³Na and ³¹P MAS NMR, and Impedance Study