Extended topological defects as sources and outlets of dislocations in   spherical hexagonal crystals
  Extended topological defects (ETDs) arising in spherical hexagonal crystals due to their curvature are considered. These prevalent defects carry a unit total topological charge and are surrounded by scalene pentagonal boundaries. Topological peculiarities of reactions between ETDs and dislocations are considered. Similarly to boundaries of the usual planar crystalline order the ETDs emit and absorb the dislocations without preservation of their dislocational charge. Dislocations located inside the ETD area lose it and the enforced ETD decay can proceed in different ways without conservation of the total Burgers vector of the dislocations emitted. 
D. S. Roshal, K.Yu. Petrov, A.E. Myasnikova, and S.B. Rochal
cond-mat.mtrl-sci cond-mat.soft