Chalcogenides stability ranges

Even though crystalline microporous materials include those with pore size between 10 and 20 A (called extra-large pore materials), few of them have a pore size within this range. This limits the applications of microporous materials to small molecules. There has always been a desire to increase the pore size of a crystalline material to more than 10 A while maintaining adequate thermal or hydrothermal stability required for various applications. Recent advances in chalcogenide and metal-organic framework materials have shown much promise for the preparation of extra-large pore materials. 

For certain purposes, mixed chalcogenides are desirable, for example, Cd(S, Se) for photoconductors sensitive to a range of visible wavelengths of light, and Cd(Se, Te) which has been proposed as photoelectrode material in photoelectro-chemical cells, with an extended spectral response compared with CdSe, and greater stability than CdTe.3... 

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