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Crystallization of β"-LiNH4SO4 and (NH4)2SO 4 in gels: growth morphology and epitaxy phenomena

Pina Martínez, Carlos Manuel and Fernández Díaz, Lourdes and Prieto Rubio, Manuel (1997) Crystallization of β"-LiNH4SO4 and (NH4)2SO 4 in gels: growth morphology and epitaxy phenomena. Journal of Crystal Growth , 177 . pp. 102-110. ISSN 0022-0248

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Abstract

The crystallization sequences in the system (NH4)2SO4 Li2SO4-H20 at 50C have been studied for solutions with an
initial [(NH4)2SO4]/[LizSO4] molar ratio higher than l. The crystal growth experiments were carried out under
isothermal conditions in a gel medium, where supersaturation was achieved by "drowning out". The phases obtained are
[The crystallization sequences in the system (NH4)2SO4 Li2SO4-H20 at 50C have been studied for solutions with an
initial [(NH4)2SO4]/[LizSO4] molar ratio higher than l. The crystal growth experiments were carried out under
isothermal conditions in a gel medium, where supersaturation was achieved by "drowning out". The phases obtained are
[β"-LiNH4SO4 (LAS) and (NH4)2SO4 (AS). The similarities exhibited by the structures of both compounds favours the
development of orientational overgrowth phenomena. The main epitaxial relationship found is the parallelism between
[0 0 1]LAS and [1 0 1]AS- The most common contact planes are (0 1 0)LAS and (1 0 1)As. Although less frequent, other
epitaxial relationships have also been observed: (0 1 0)LAS ║(0 1 0)AS and [1 0 0]Las ║ [1 0 0]AS. The development of the
overgrowth is interpreted on the grounds of the structural considerations and the characteristics of the crystallization
medium.

Item Type:Article
Uncontrolled Keywords:Crystallization of β"-LiNH4SO4; Crystallization (NH4)2SO4; Growth morphology
Subjects:Sciences > Geology > Crystallography
ID Code:14049
Deposited On:12 Dec 2011 10:32
Last Modified:12 Dec 2011 10:32

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