Calcium nitrate tetrahydrate Ca NO

Calcium nitrate tetrahydrate (Ca(NO3)2⋅4H2O, AR), aluminum nitrate nonahydrate (Al(NO3)3⋅9H2O, AR) and holmium chloride hexahydrate (HoCl3⋅6H2O, AR) were used as starting materials with sodium hydroxide (NaOH, AR) as precipitant. All starting materials were weighed according to Wnt-C59 ratios of C12A7–x mol.% Ho3+ (Ca:Al = 12:14 with x = 0, 1, 2 and 5).