[MIS10-P05] Influence of Ammonium Nitrate on Crystallization of Norsethite from Aqueous Solution
Keywords:Norsethite, Aqueous Solution Growth, Ammonium Nitrate
Since norsethite BaMg(CO3)2 has birefringence higher than previous piezoelectric and optical crystals, we expect that norsethite can be used as new acousto-optics andwavelength-conversion devices. However, solubility of norsethite is low and it is difficult to control supersaturation. Hence growth of norsethite is difficult. Then, we investigated effects of ammonium nitrate NH4NO3 on crystallization of norsethite from aqueous solution. With increasing NH4NO3, solubility of norsethite increased. When concentration of NH4NO3 reached to 1M, solubility of norsethite became 30 times larger than without the addition of NH4NO3.With further increasing NH4NO3, solubility of norsethite remained constant. Next, we measured induction periods of norsethite, when 1M NH4NO3 was added. Then, we could confirm norsethite just after mixed at 70oC by XRD measurement only in the case of the addition of 1M NH4NO3. Thus, we revealed that the addition of NH4NO3 also accelerates norsethite crystallization. This study concluded that addition of NH4NO3 is valid for the growth of norsethite.