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The Microwave Cavity Perturbation Technique for Contact-Free and in Situ Electrical Conductivity Measurements in Catalysis and Materials Science

The Microwave Cavity Perturbation Technique for Contact-Free and in Situ Electrical Conductivity Measurements in Catalysis and Materials Science

Maik Eichelbaum, Reinhard Stösser, Andrey Karpov, Cornelia-Katharina Dobner, Frank Rosowski, Annette Trunschke, Robert Schlögl

Phys Chem Chem Phys. 2012 Jan 21;14(3):1302-12.

PMID: 22146931

Abstract:

We have developed a noncontact method to probe the electrical conductivity and complex permittivity of single and polycrystalline samples in a flow-through reactor in the temperature range of 20-500 °C and in various gas atmospheres. The method is based on the microwave cavity perturbation technique and allows the simultaneous measurement of microwave conductivity, permittivity and of the catalytic performance of heterogeneous catalysts without any need for contacting the sample with electrodes. The sensitivity of the method towards changes in bulk properties was proven by the investigation of characteristic first-order phase transitions of the ionic conductor rubidium nitrate in the temperature range between 20 and 320 °C, and by studying the temperature dependence of the complex permittivity and conductivity of a niobium(V)-doped vanadium-phosphorous-oxide catalyst for the selective oxidation of n-butane to maleic anhydride. Simultaneously, the catalytic performance was probed by on line GC analysis of evolving product gases making the technique a real in situ method enabling the noninvasive investigation of electronic structure-function relationships.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13126120	Rubidium nitrate		13126-12-0	Price

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