Zirconium niobate

Zirconium Niobate.—The salt ZrQ2.5Nb2Os has been obtained in cloudy, rod-like needles, similarly to the thorium salt density 5 14.u This salt is remarkable for its large content of acid oxide. 

Zirconium can be removed from the mixed precipitated acids by fusing them with potassium carbonate and extracting the melt with cold water. The niobium and tantalum pass into solution as niobate and tantalate of potassium respectively, while the zirconium remains undissolved as the dioxide, Zr02.4 The method is more suited for the removal of zirconium from niobates than from tantalates.3... 

A large number of inorganic layer crystals such as micas, sodium silicates, niobate, uranate, vanadate, titanate, zirconium phosphate, graphitic acids, crystalline silicic acids, vanadium oxyhydrate, calcium phosphoric acid esters, and titanium disulfide develop alkyl crystals between their rigid crystal layers by ion exchange with, for example, alkyl ammonium salts and by intercalation inorganic... 

Fine-particle zirconium titanates <1997MI83> and lead-based ferroelectric niobates <1998MI380> have been prepared by the solution combustion process using corresponding metal nitrates/oxalate and tetraformaltrisazine (octahydro-[l,2,4,5]tetrazino[l,2- ][l,2,4,5]tetrazine) <1966BCJ504>. 

Intercalation of [Ru(bpy)3] " into MnPS3 (103-105) and niobate (K4Nb60i7 3H20) (106,107) has been reported as well. From spectroscopic studies of the [Ru(bpy)3] -MnPS3 system, it was concluded that intCTcalated [Ru(bpy)3] + is bound weakly. Nakato et al. have prepared two types of intercalation compounds of K4Nb60i7 with [Ru(bpy)3]. Two types of alkylammonium-intercalated K NbeO were used as intermediates. One compound involves [Ru(bpy)3] in only interlayer I, and the other involves Ru(II) in both interlayers I and II (106). Since the electronic properties of the hosts (both niobate and MnPSs) are quite different from those of smectites, one may observe unique photoprocesses. Possible surface dilution effects on the photophysics of [Ru(bpy)3] have been reported for zirconium phosphate (108) and K4Nb6Oi7(107) systems. 

De G., Chatterjee A., Ganguli D. Zirconia fibres from zirconium n-propoxide-acetyleacetone-water-isopropanol system. J. Mater. Sd. Lett. 1990 9 845-846 Eichorst D.J., Payne D.A. Evolution of molecular structure in alkoxide-derived lithium niobate. 

The incorporation of other oxides into the pores of zeolites and related materials has been studied to a much lesser extent. Some reports have been published concerning the preparation of intrazeolitic copper oxide [112-115], cobalt oxide [116-118], nickel oxide and nickel niobate [119, 120], iron oxide [121-124], manganese oxide [118], phosphorus oxide [125,126], rhenium oxide [127], zirconium oxide [128], tin oxide [129,130] and rhodium vanadate [120, 131] clusters by impregnation methods. 

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