Kinetics of the topotactic formation of siloxene

Günther Vogg; Martin S. Brandt; Martin Stutzmann

doi:10.1021/cm020939e

Kinetics of the topotactic formation of siloxene

Günther Vogg, Martin S. Brandt, Martin Stutzmann

TUM Emeriti of Excellence

Walter Schottky Institut

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The kinetics of the topotactic transformation reaction of the epitaxial Zintl phase CaSi₂ into the sheet polymer siloxene in aqueous hydrochloric acid solutions have been studied. The effects of acid concentration, temperature, and crystal orientation on the reaction rates have been determined by in-situ electrical conductivity measurements. The reaction rate is found to be anisotropic with the reaction front propagating about 10 times faster in-plane to the CaSi₂ layering than perpendicular to it. The reaction is generally limited by the chemical reaction rate and is thermally activated with an activation energy of 0.40(2) eV. The total reaction rate is significantly influenced by the HCl concentration with a maximum value observed for a concentration of 13 wt %. The implications of the kinetic data obtained are discussed in detail.

Original language	English
Pages (from-to)	910-915
Number of pages	6
Journal	Chemistry of Materials
Volume	15
Issue number	4
DOIs	https://doi.org/10.1021/cm020939e
State	Published - 25 Feb 2003

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10.1021/cm020939e

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title = "Kinetics of the topotactic formation of siloxene",

abstract = "The kinetics of the topotactic transformation reaction of the epitaxial Zintl phase CaSi2 into the sheet polymer siloxene in aqueous hydrochloric acid solutions have been studied. The effects of acid concentration, temperature, and crystal orientation on the reaction rates have been determined by in-situ electrical conductivity measurements. The reaction rate is found to be anisotropic with the reaction front propagating about 10 times faster in-plane to the CaSi2 layering than perpendicular to it. The reaction is generally limited by the chemical reaction rate and is thermally activated with an activation energy of 0.40(2) eV. The total reaction rate is significantly influenced by the HCl concentration with a maximum value observed for a concentration of 13 wt %. The implications of the kinetic data obtained are discussed in detail.",

author = "G{\"u}nther Vogg and Brandt, {Martin S.} and Martin Stutzmann",

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T1 - Kinetics of the topotactic formation of siloxene

AU - Vogg, Günther

AU - Brandt, Martin S.

AU - Stutzmann, Martin

PY - 2003/2/25

Y1 - 2003/2/25

N2 - The kinetics of the topotactic transformation reaction of the epitaxial Zintl phase CaSi2 into the sheet polymer siloxene in aqueous hydrochloric acid solutions have been studied. The effects of acid concentration, temperature, and crystal orientation on the reaction rates have been determined by in-situ electrical conductivity measurements. The reaction rate is found to be anisotropic with the reaction front propagating about 10 times faster in-plane to the CaSi2 layering than perpendicular to it. The reaction is generally limited by the chemical reaction rate and is thermally activated with an activation energy of 0.40(2) eV. The total reaction rate is significantly influenced by the HCl concentration with a maximum value observed for a concentration of 13 wt %. The implications of the kinetic data obtained are discussed in detail.

AB - The kinetics of the topotactic transformation reaction of the epitaxial Zintl phase CaSi2 into the sheet polymer siloxene in aqueous hydrochloric acid solutions have been studied. The effects of acid concentration, temperature, and crystal orientation on the reaction rates have been determined by in-situ electrical conductivity measurements. The reaction rate is found to be anisotropic with the reaction front propagating about 10 times faster in-plane to the CaSi2 layering than perpendicular to it. The reaction is generally limited by the chemical reaction rate and is thermally activated with an activation energy of 0.40(2) eV. The total reaction rate is significantly influenced by the HCl concentration with a maximum value observed for a concentration of 13 wt %. The implications of the kinetic data obtained are discussed in detail.

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U2 - 10.1021/cm020939e

DO - 10.1021/cm020939e

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VL - 15

SP - 910

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JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 4

ER -

Kinetics of the topotactic formation of siloxene

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