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This paper reports on the results of cobalt titanates preparation by calcination of green bodies obtained by a co-precipitation method. For the investigations were used: as titanium sources, acidic solutions of titanyl sulfate and hydrous titanium dioxide, originating from the production process of titanium dioxide by sulfate method. The composition of the obtained materials was determined using titration methods. The calcined powders were characterized by X-ray diffraction method. It has been found that the obtained products are composed of cobalt methatitanate CoTiO3 or cobalt orthotitanate Co2TiO4 occurring as single phases, and also as cobalt titanates and titanium dioxide phase mixtures. The proposed method of proceeding can be used for the preparation of series of transition metals titanates, such as nickel, iron, zinc, copper and also aluminium titanates.
This paper shows the results of investigation of titanium(IV) phosphates precipitation from acidic solution of titanyl sulfate. In investigation was used the titanyl sulfate solution obtained as the product of decomposition of ilmenite by sulfuric acid during production of titanium dioxide white pigments. The titanium(IV) phosphates were precipitated by the action of orthophosphoric acid, at different acid concentration. It has been found that precipitation of titanium phosphates occurs at phosphoric acid concentration range from 5 to 80 wt%. The prepared materials were analysed using chemical, thermogravimetric and X-ray diffractometric methods. It has been established that freshly precipitated titanium phosphates are practically amorphous. During their thermal treatment are formed crystalline products which, in dependence on used phosphoric acid concentration, are composed of titanium pyrophosphate, TiP2O7 or mixture of titanium pyrophosphate and titanium oxide biphosphate, Ti2O(PO4)2
Different methods of calculations of thermal conductivity of gas laser mixtures versus temperature are compared in the paper. Approximation functions describing the experimental data of thermal conductivity and viscosity of the chosen gases (CO/sub 2/, N/sub 2/, He, Xe, CO, O, Ar) are given. The formulas introduced and data obtained allow us to predict thermal conductivity and temperature distribution of a typical high power laser gas mixture. Examples of temperature distribution in RF excited CO/sub 2/, CO, and Xe laser media are shown. Knowledge of the temperature distribution in the laser cavity can be useful for predicting general optical properties of the laser.
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