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Abstract  

Methods of DTA, TG, DSC, IR spectroscopy and X-ray phase analysis were used to study the thermal dehydration and decomposition of Ca2+ and Sr2+ peroxotitanates to the corresponding metatitanates. The stages of the process and the intermediate phases were identified. The information obtained was utilised to determine the optimum temperatures of heating of the initial peroxotitanates to yield metatitanates with a fairly high degree of crystallinity (for CaTiO3 680C, and for SrTiO3 650C).

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Abstract  

Methods of DTA, TG, X-ray phase analysis and IR spectroscopy were used to study the thermal dehydration and decomposition of Ni2+ and Zn2+ peroxotitanates to the corresponding metatitanates. The course of the process was established and the intermediate phases were identified. The information obtained was utilized to determine the optimum temperatures of heating the initial peroxotitanates for conversion to metatitanates with a fairly high degree of crystallinity (for ZnTiO3 the optimum temperature is 600C, while for NiTiO3 it is 550C).

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Abstract  

Bi-peroxotitanate was synthesized by a peroxo method and after thermal decomposition Bi2Ti2O7 was obtained. DTA, TG and DSC curves of Bi2[Ti2(O2)4(OH)6]5H2O were recorded and used to determine isothermal conditions suitable for obtaining the intermediate samples corresponding to the phases observed during the thermal decomposition. The samples were identified by quantitative analysis, IR spectroscopy and X-ray analysis. The experimental results were used to propose a mechanism of thermal decomposition of the investigated compound to a nanosized Bi2Ti2O7. The optimum conditions were also determined for obtaining Bi2Ti2O7, which is applicable for piezosensors.

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Abstract  

Potassium peroxotitanate was synthesized by the peroxo method. During the thermal decomposition K2Ti2O5 can be obtained. The isothermal conditions for decomposition of K2[Ti2(O2)2(OH)6]3H2O were determined on the base of DTA, TG and DSC results. DTA and TG curves were recorded in the temperature range 20 and 900C at a heating rate of 10C min–1. The obtained intermediate compounds were characterized by means of quantitative analysis and IR spectroscopy. The mechanism of thermal decomposition of K2[Ti2(O2)2(OH)6]3H2O to K2Ti2O5 was studied. The optimal conditions for obtaining K2Ti2O5 were determined (770C for 10 h).

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Abstract  

TG, DTA and DSC curves of Cd2[Ti2(O2)2O(OH)6]·H2O were recorded and used to determine the isothermal conditions suitable for obtaining the intermediate samples corresponding to the phases observed during the thermal decomposition. The samples were identified by quantitative analysis, IR spectroscopy and X-ray analysis. The experimental results were used to propose a mechanism of thermal decomposition of the investigated compound to CdTiO3. The optimum conditions were also determined for obtaining CdTiO3 with well-defined crystallinity.

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. Gao , Y , Masuda , Y , Seo , W-S , Ohta , H , Koumoto , K . TiO 2 nanoparticles prepared using an aqueous peroxotitanate solution . Ceramics International . 2004 ; 30 : 1365 – 1368 . 10.1016/j.ceramint.2003

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compound consists of two peroxotitanate fragments interlinked through the bridging oxygen atom (O7). Each Ti atom in compound 1 is coordinated by three oxygen atoms and one nitrogen atom from a fully deprotonated nta 3− ligand, one bridging oxygen atom

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titanium peroxo complex formed [ 25 ]. Such colors are typical for the formation of peroxotitanates [ 26 ], where Ti 4+ ions are complexed with bidentate [O 2 ] 2− ligands. Tungsten hexachloride WCl 6

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