Many Research Articles are describing the salt bed for placing the samples and is placed in an alumina crucible and heated to several degrees. I need an answer in preparing the salt bed in which composition and ratio?
First step is to identify the temperature at which you are going to carryout the synthesis (melting temperature of reactants).
Secondly you have to prepare various percentage compositions of KCl and NaCl like 10:90, 20:80, 30:70, 40:60...
Finally you have to find out the melting point of all the Eutectic compositions using TRANSITION TEMPERATURE apparatus then you can select the right composition of Eutectic Mixture.