Structural studies of amorphous and crystalline Tl-As-Se compounds

1573-4803

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Abstract X-ray diffraction and microstructure studies for amorphous samples of composition (As2Se3)1−x Tl x , wherex varies between 0 and 0.7, show that up tox=0.25 the short-range order is similar to that of As2Se3. A change in the structure is observed asx increases. Diffraction from samples crystallized by annealing confirms that a thallium content up tox=0.25 is not enough to alter a characteristic matrix similar to crystalline As2Se3; however, it results in a decrease of crystallization tendency. Forx〉0.25 up to 0.7 the structural matrix features are almost similar to those of crystalline TlAsSe2. The observed structural changes could rationalize reported changes in the electrical and thermal transport properties of the amorphous ternary system compounds.

Electronic Resource