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The authors attribute to the existence of high polymers the decrease in reactivity and the appearance of cloudiness in aged alkaline niobate solutions. Gel permeation and ultracentrifugation can be used to determine the order of magnitude (10(4) and 6 x 10(4)) of the molecular weight of these particles and their proportion (5%). The structure of these ions is used to explain this exceptional behaviour of the solutions.
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Département de Chimie de la Faculté des Sciences d'Alger, 2, rue Mourad Didouche, Algérie.
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