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The double oxalates M I 3 [M III (C 2 O 4 ) 3 ] possess rich crystallochemistry and can be used as precursors for various ceramic materials. The article discusses a case of Li 3 [Al(C 2 O 4 ) 3 ]. A series of previously unknown hydrates (Li 3 [Al(C 2 O 4 ) 3 ] ⋅ 5.5H 2 O, Li 3 [Al(C 2 O 4 ) 3 ] ⋅ 4H 2 O, Li 3 [Al(C 2 O 4 ) 3 ] ⋅ H 2 O) was found for this composition, their crystal structure and temperatures of mutual transformations determined. Transformation from Li 3 [Al(C 2 O 4 ) 3 ] ⋅ 4H 2 O to Li 3 [Al(C 2 O 4 ) 3 ] ⋅ H 2 O was found to be accompanied by a change in the topology of the bonding network. Uniaxial negative thermal expansion was found for anhydrous Li 3 [Al(C 2 O 4 ) 3 ]. Thermal decomposition of Li 3 [Al(C 2 O 4 ) 3 ] was demonstrated to be a promising way to obtain precursors for aluminate ceramics.
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Missyul et al. (2024) studied this question.
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