“…Preparation of samples: Table 1 shows the conditions under which samples 1 to 10 were obtained. The experiments were performed with LN(Y, 2) and LT(Y, 2) plates of optical quality. As sources of H + ions we used melts of different acidicty: stearic acid [42], NH4H2P0, [43], and a solution of LiCl in glycerine [41].…”