The phase diagram for the quasi-binary Tl2Te-Bi2Se3 system was delineated from the results of phase studies by both common thermal analysis and X-ray diffraction. Numerical values of the phase transition temperatures at different alloy compositions within the whole concentration range, were obtained. They have been listed in a table that can be used by other authors in any computational treatment of the system. The diagram was compared with that published earlier by other authors employing differential thermal analysis as a main experimental method. As a result of the present study, three new chemical compounds have been found. (c) 2012 Elsevier B.V. All rights reserved.