Lecturer of the Materials Engineering Department at the University of Technology, Dr. Abbas Khammas Hussain, Head of General Materials Engineering Branch, published a scientific book titled Engineering Materials Installation, issued by the Tigris Library in its first edition of 2017. The third chapter deals with the structure of the crystal. The fourth chapter deals with the structure of the atom. The fifth chapter deals with the composition of the solid materials. Chapter 6 contains the crystalline defects, and the seventh and final chapters Phase charts.