Kapustinskii formula,

Kapustinskii s equation, of course, cannot be expected to produce values for the lattice energies as exact as those produced by extended calculation. Essentially the Kapustinskii formula ignores all contributions to the lattice energy save Us and Uu. If the ions are nonspherical there is considerable difficulty in choosing a repulsion envelope for the ion and assigning a radius. This difficulty also arises in the extended calculation of the lattice energy but only in calculation of Ur, which is an order of magnitude less than Um- In the Kapustinskii equation this difficulty arises in Um as well. 

Azide Kapustinskii formula Term-by-term calculation (a) Ionic radius (b) Lyotropic number... 

Yatsimirskii s thermochemical radii are obtained from Kapustinskii s empirical formula for the lattice energy of crystalline salts. The lattice energy is the heat evolved when the gaseous cation and anion combine to form the salt ... 

AHf cation (g), and AHf salt (c) are the respective heats of formation of gaseous cation, gaseous anion, and crystalline salt. Kapustinskii s formula for univalent salts is —... 

Kapustinskii s formula and, 1 177-179 Templeton s calculations and, 1 179-181 nuclear recoil and, 1 272-278 in water, 39 401 35, see also Alkali, halide crystals Rock-salt-type alkali halide crystals... 

Kapustinskii noted that if the Madelung constant A is divided by the number of ions per formula unit for a number of crystal structures, nearly the same value is obtained. Furthermore, as both A/n and re increase with the coordination number, their ratio A/nre is expected to be approximately the same from one structure to another. Therefore, Kapustinskii proposed that the structure of any ionic solid is energetically equivalent to a hypothetical rock-salt structure and its lattice energy can be calculated using the Madelung constant of NaCl and the appropriate ionic radii for (6,6) coordination. 

Salt Yatsimirskii Kapustinskii s formula with radius of NCO = 2.04 A Hydration heat from radius of 2.04 A E. tended calculation... 

Their rigorous theoretical computation is a demanding task to obtain an accurate result, the contributions of tens of thousands of ions must be taken into account [253-257] (Madelung constants for organic salts are presented in [258]). This stimulated the quest for more economic methods of calculating the most successful one has been suggested by Kapustinskii [259, 260], who related Ku to the number (m) and valence (Z) of ions which comprise the formula unit of the crystal ... 

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