TY - JOUR

T1 - Chemical reactions and structural phase transitions of sodalites and cancrinites in temperature dependent infrared (TIR) experiments

AU - Rüscher, Claus H.

N1 - Funding Information: Results on the exchange reaction in sodalites goes back to the financial support within the DFG project on structure gradients in sodalites (RU764/3), which is gratefully acknowledged. The synthesis of cancrinites was part of a collaboration project with Prof. C. Linares (Carabobo University, Venezuela) as supported by the DAAD, which is, therefore, also gratefully acknowledged. Prof. J.-Chr. Buhl is thanked for providing nitrate and borate sodalite samples. I am thankful to Peter Stünkel who obtained part of the TIR results on the Cancrinite within his Diploma-work at our Department. Nada Salman, also working at our Department, is thanked for preparing the Al–Si containing liquid. The unknown referees and the editor are thanked for their helpful advices.

PY - 2005/11/28

Y1 - 2005/11/28

N2 - The infrared absorption of a solid highly diluted within an infrared transparent pellet (e.g., KBr, NaCl, etc.) is easily measured as a function of the temperature up to the melting point of the matrix. A disadvantage could be any interaction or chemical reaction between the matrix and the sample. However, such reactions and reactions within the embedded sample can be used in a systematical way for the investigation of the creation of new materials. Here, four types of working examples will be given. Starting with typical temperature dependent (TIR) investigations on the phase transition characteristics of a NaNO3-sodalite it is shown how this intrinsic property is effected by an exchange of Na/K between the matrix and the sodalite. Secondly, the effect of dehydration on NaB(OH)4-sodalite as studied in situ in the KBr pellet is considered. Thirdly, in situ investigations of the formation of new compositions within the family of cancrinites are described. Here, the effect of dehydration, and the combined exchange of Na/K and Cl/Br/NO3 of this typical microporous material is reported. Finally, the first steps of the soft chemically formed sodalite from the sol-gel liquid in the KBr container will be outlined briefly.

AB - The infrared absorption of a solid highly diluted within an infrared transparent pellet (e.g., KBr, NaCl, etc.) is easily measured as a function of the temperature up to the melting point of the matrix. A disadvantage could be any interaction or chemical reaction between the matrix and the sample. However, such reactions and reactions within the embedded sample can be used in a systematical way for the investigation of the creation of new materials. Here, four types of working examples will be given. Starting with typical temperature dependent (TIR) investigations on the phase transition characteristics of a NaNO3-sodalite it is shown how this intrinsic property is effected by an exchange of Na/K between the matrix and the sodalite. Secondly, the effect of dehydration on NaB(OH)4-sodalite as studied in situ in the KBr pellet is considered. Thirdly, in situ investigations of the formation of new compositions within the family of cancrinites are described. Here, the effect of dehydration, and the combined exchange of Na/K and Cl/Br/NO3 of this typical microporous material is reported. Finally, the first steps of the soft chemically formed sodalite from the sol-gel liquid in the KBr container will be outlined briefly.

KW - Ion exchange reactions

KW - Phase transitions

KW - Sodalites and cancrinites

KW - Synthesis

KW - Temperature dependent infrared

UR - http://www.scopus.com/inward/record.url?scp=27644482268&partnerID=8YFLogxK

U2 - 10.1016/j.micromeso.2005.05.054

DO - 10.1016/j.micromeso.2005.05.054

M3 - Article

AN - SCOPUS:27644482268

VL - 86

SP - 58

EP - 68

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

IS - 1-3

ER -