A nearly complete system of average crystallographic ionic radii and its use for determining ionization potentials

Bugaenko, L.T.; Ryabykh, S. M.; Bugaenko, A. L.

doi:10.3103/s0027131408060011

Cited by 66 publications

(42 citation statements)

References 21 publications

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“…3a. The presence of two temperature regions with different Е а values indicates that the state of M 2+ active centers changes as the temperature The presence of Arrhenius dependence kinks for the dehydrogenation of propanol 2 substantiates the catalytic data obtained by us for butanol 2, butanol 1, and isobutanol [16]. In transition through Т* ∼ 320°С, Е а values for the dehydrogenation of С 3 -С 4 alcohols decrease by 2-4 times, which is explained by a change in the arrangement of extra framework mobile M 2+ ions.…”

Section: Resultssupporting

confidence: 79%

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Catalytic dehydrogenation of propanol-2 on Na-Zr phosphates containing Cu, Co, and Ni

Povarova

Пылинина

Михаленко

2012

Russ. J. Phys. Chem.

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The dehydrogenation of propanol 2 on sodium zirconium phosphates (NZP) with the composi tion Na 1 ⎯ 2x M x Zr 2 (PO 4 ) 3 (x = 0.125 and 0.25) in which Na + ions were replaced by M 2+ = Co 2+ , Ni 2+ , and Cu 2+ ions was studied. The experimental reaction activation energy E a decreased while transition through the T* = 310-340°C temperature; above this temperature, the electrophysical and crystallographic properties of the material changed. These changes were explained by the reversible transfer of Me 2+ ions from position M1 to M2 in the NZP lattice. Me 2+ centers with different alcohol adsorption forms at T < T* (one point) and T > T* (two point) participated in the dehydrogenation reaction. For the first form, E a and the logarithm of the preexponential factor linearly correlated with the ionic radius of M 2+ . The activity of M NZP catalysts altered in repeated experiments and in cases when the direction of temperature variations changed.

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Section: Resultssupporting

confidence: 79%

“…Ni 2+ has the lowest radius in the series Ni 2+ (0.71) < Co 2+ (0.74) ~ Cu 2+ (0.75). The r, Å values (given in paren theses) according to Belov and Bokii were taken from [16]. The highest mobility and, therefore, ability to participate in M1 → M2 transitions are characteristic of ions with the smallest radius.…”

Section: Resultsmentioning

confidence: 99%

Catalytic dehydrogenation of propanol-2 on Na-Zr phosphates containing Cu, Co, and Ni

Povarova

Пылинина

Михаленко

2012

Russ. J. Phys. Chem.

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“…In the case of the α and γ phases, E a, σ increases in the series Cu 2+ → Fe 3+ → Zr 4+ , which shows the influence of the charge of the dopant cation on the conductivity of BIMEVOX, but there is no correlation between Е а, σ and the crystal ion radius (Сu 2+ = 0.075, Fe 3+ = 0.062, Zr 4+ = 0.072 nm from [14]). At medium concentrations х М (orthorhombic β phase), the activation energies of conductivity are almost the same for all М n+ .…”

Section: Resultsmentioning

confidence: 89%

The Role of Structure and Conductivity of Perovskites Bi4V2−2x M2x O11−δ (M = Cu2+, Fe3+, Zr4+) in the Catalytic Dehydrogenation of Isobutanol

Михаленко

Povarova

Пылинина

2016

Russ. J. Phys. Chem.

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The catalytic activity of solid electrolytes from the family of complex bismuth vanadates Bi 4 V 2 -2x M 2x O 11 -δ (BIMEVOX) with V 5+ ions partially substituted by 3d metal cations was studied. In the transformations of isobutanol, it was found to depend on the crystal structure (α, β, γ Aurivillius phases), which changes at increased dopant ion contents (х М ). The highly conductive tetragonal γ phase was most active for all BIMEVOX oxides. The activation energy of the dehydrogenation of isobutanol Е increased linearly with the charge of the M n+ ion and activation energy of conductivity of the γ phase of BIMEVOX in the series Cu 2+ → Fe 3+ → Zr 4+ .

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“…Sr has almost the same ionic radius (1.13 Å) as La (1.15 Å), the Ca ionic radius (0.99 Å) is smaller and the Ba ionic radius (1.35 Å) is larger than that of La [16].…”

Section: +mentioning

confidence: 98%

The features of structural transformations in lanthanum manganites La1−xAxMnO3+δ (A = Ca, Sr, Ba)

Sedykh¹

2014

AIP Conference Proceedings

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Abstract. In this work, the effect of the ionic radius and concentration of a doping element on the features of the structural transformations in polycrystalline lanthanum manganites, La 1-x A x MnO 3+ (A = Ca, Sr, Ba), has been studied by Mössbauer spectroscopy and X-ray diffraction analysis. For Mössbauer investigations, a small amount of 57 Fe (2 at%) Mössbauer isotope was introduced into the samples. It follows from the analysis of the obtained data that both common features of the structural transformations and differences between them exist in lanthanum manganites depending on ionic radius and concentration of a doping element.

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A nearly complete system of average crystallographic ionic radii and its use for determining ionization potentials

Cited by 66 publications

References 21 publications

Catalytic dehydrogenation of propanol-2 on Na-Zr phosphates containing Cu, Co, and Ni

Catalytic dehydrogenation of propanol-2 on Na-Zr phosphates containing Cu, Co, and Ni

The Role of Structure and Conductivity of Perovskites Bi4V2−2x M2x O11−δ (M = Cu2+, Fe3+, Zr4+) in the Catalytic Dehydrogenation of Isobutanol

The features of structural transformations in lanthanum manganites La1−xAxMnO3+δ (A = Ca, Sr, Ba)

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