Cation mobility and ion exchange in acid tin phosphate

Стенина, И. А.; Алиев, А. Д.; Glukhov, Ivan V.; Спиридонов, Ф. М.; Yaroslavtsev, A. B.

doi:10.1016/s0167-2738(03)00229-7

Cited by 16 publications

(13 citation statements)

References 8 publications

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“…They have attributed this behaviour to the strong H-bonds in acid tin phosphate resulting in a higher energy requirements for proton jumps from one site to another. 21 Similar explanation can also be extended in case of SnP in the present study.…”

supporting

confidence: 84%

“…Stenina and coworkers have reported the conduction behaviour of tin phosphate. 21 Literature survey reveals that most of the proton transport properties carried out in case of zirconium phosphate and titanium phosphate have been on crystalline phases and not many reports exist in the case of tin phosphate. We therefore considered it worth while to study the proton transport properties of amorphous M(IV) phosphates, where M(IV) = Zr, Sn and Ti abbreviated as ZrP, SnP and TiP respectively, and compare their proton conduction behaviour.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of proton transport properties of metal (IV) phosphates

Patel

Chudasama

2007

J Chem Sci

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M(IV) phosphates of the class of tetravalent metal acid (TMA) salts where M (IV) = Zr, Ti, Sn has been synthesized by the sol-gel method. These materials have been characterized for elemental analysis (ICP-AES), thermal analysis (TGA, DSC), X-ray analysis and FTIR spectroscopy. Chemical resistivity of these materials has been accessed in acidic, basic and organic solvent media. The protons present in the structural hydroxyl groups indicates good potential for TMA salts to exhibit solid-state proton conduction. The transport properties of these materials has been explored by measuring specific proton conductance at different temperatures in the range of 30-120°C at 10°C intervals, using a Solartron Dataset impedance analyzer (SI 1260) over a frequency range 1 Hz-10 MHz at a signal level below 1 V. Based on the specific conductance data and the Arrhenius plots, a suitable mechanism has been proposed and conductance performance of ZrP, SnP and TiP compared.

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supporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

A comparative study of proton transport properties of metal (IV) phosphates

Patel

Chudasama

2007

J Chem Sci

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“…5a, b, c. In the present study, E a values in kcal mol -1 , follow the order ZrHEDP (13.20) > ZTHEDP (11.13) > TiHEDP (2.87), however, the specific conductance values follow the order ZTHEDP > ZrHEDP > TiHEDP. High E a and high conductance values have also been observed previously by us and other researchers [16,20]. Lower E a values indicate ease of conduction and suggest the mechanism to be Grotthuss type, where E a entirely depends on reorientation of water molecules on the surface which has been explained earlier in the text.…”

Section: Impedance Measurementssupporting

confidence: 83%

“…E a values depend on several factors such as high density of mobile ions, the availability of vacant sites, good connectivity among the sites, complexity in structure/steric effect, acidity (charge to size ratio) of the metal ion and hydrogen bonding resulting in a higher energy requirement for proton jump from one site to another [19,20]. The observed E a is a result of the contribution of the above-mentioned factors.…”

Section: Impedance Measurementsmentioning

confidence: 99%

Synthesis, characterization and proton transport properties of mixed metal phosphonate-zirconium titanium hydroxy ethylidene diphosphonate

Thakkar

Chudasama

2010

JICS

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Novel hybrid material, zirconium titanium hydroxy ethylidene diphosphonate (ZTHEDP) of the class of tetravalent bimetallic acid (TBMA) salt was synthesized using sol-gel route. ZTHEDP was characterized for elemental analysis (zirconium, titanium and phosphorus by ICP-AES and carbon and hydrogen by CHN analyzer), spectral analysis (FTIR), thermal analysis (TGA), Xray diffraction studies and SEM. Chemical resistivity of this material was assessed in various media-acids, bases and organic solvents. The protons present in the structural hydroxyl groups in ZTHEDP indicate good potential to exhibit solid state proton conduction. The proton transport property of ZTHEDP was explored by measuring specific conductance at different temperatures in the range of 303-423 K at 10 K intervals, using Solartron Impedance Analyzer (SI 1260) over a frequency range 1 Hz-32 MHz at a signal level below 1 V. Zirconium hydroxy ethylidene diphosphonate (ZrHEDP) and titanium hydroxy ethylidene diphosphonate (TiHEDP) were also synthesized under identical conditions, characterized and their proton transport properties investigated for comparative studies. It is observed that, in all cases, conductivity decreases with increasing temperature. Conductivity performance of ZTHEDP, ZrHEDP and TiHEDP is discussed based on conductivity data and activation energy. It is observed that, ZTHEDP exhibits enhanced conductance and the mechanism of transportation is proposed to be Grotthuss type.

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“…It is also reported that the conductivity varies linearly with the number of surface phosphate groups [19]. The mechanism of diffusion and proton transport in crystalline zirconium phosphate (ZP), titanium phosphate (TP), tin phosphate, tantalum phosphate, uranyl phosphate have been studied in detail by various workers [19][20][21][22][23][24][25][26][27][28][29]. From our laboratory, we have reported proton transport properties of M(IV) tungstates and phosphates, where M(IV) = Zr, Sn, Ti [30,31].…”

Section: Introductionmentioning

confidence: 99%