Elastic energy, stress field of dislocations, and dislocation parameters in calcite crystals

Elastic energy and dislocation parameters for various slip-twinning dislocations in a calcite crystal at temperatures between 25 and 250°C are obtained by numerical calculations in terms of an anisotropic elasticity theory. The results are applied to the stress fields around edge dislocations. It becomes evident that the K values at T°C within the temperature range from 25 to 250°C may be given by K = α′ – βT where K is the energy factor, T is the temperature, and α′, β are constants. The energy factor and the elastic energy for {110} {001} twinning dislocations are the smallest among those for other edge dislocations, and those for {001} 〈110〉 and {111} 〈110〉 slip dislocations are also very small. The stress fields around edge dislocations show a distinct anisotropic effect.