T ( t ) = T 0 + βt . The measurements started at the temperature T 0 = 30 °C. The measurements were carried out in a static air atmosphere. The α-Al2O3 was used as a reference material.
After obtaining α ( t ) and d α ( t )/d t
Sharma , P-K , Varadan , V-V , Varadan , V . K. A critical role of pH in the colloidal synthesis and phase transformation of nano size α-Al2O3 with high surface area . J Eur Ceram Soc . 2003 ; 23 : 659 – 666
Diamond powder (Huifeng Diamond, size 0.8 μm) was used as an external standard in the PXRD measurements (used for organic mixture measurements). Synthetic sapphire, α-Al2O3 (NIST, SRM720) was used as a reference material for heat capacity studies. The
adjusted at 20 °C min −1 . α-Al2O3 was used as a reference material for the thermal measurements.
XRD method (DRON-3.0, Burevestnik, Russia) with monochromatic CuK α radiation was used to analyze the phase composition of reaction products
principle of the adiabatic calorimeter have been described in detail elsewhere [ 14 – 18 ].
Prior to the heat capacity measurement of the sample, the molar heat capacities of α-Al2O3 , the standard reference material, were measured from 78 to
. Highly sintered α-Al2O3 was used as a reference. Elemental analysis for C, H, and N were performed using a Carlo Erba 1106 microanalyser.
Preparation of the complexes
To synthesis complex 1 , [Cu 2 (PA) 4 (H 2 O) 2
performed in crucibles from α-Al2O3 , initial sample mass 19–21 mg (crushed to fine powders) was used in all measurements.
Results and discussion
Comparison of aerogels appearance after polycondensation and after
thermal analysis in corundum crucible with the increase of temperature 10 °C min −1 . α-Al2O3 was used as reference material [ 8 ].
The powder pigments were also studied by X-ray diffraction analysis. The X-ray diffractograms of the samples