Abstract

The T(z) diagram of the system Cu 2(1− z) Mn z In 2Te 4 was obtained from X-ray powder diffraction and differential thermal analysis measurements. At high temperatures, there is single-phase solid solution across the complete diagram in a disordered defect zinc-blende phase β. This β phase shows a eutectoid reaction at z=0.49 and T=452 °C giving the two tetragonal terminal phases α, CuInTe 2, and γ, MnIn 2Te 4, of space groups I 4 2 d and I 4 2 m, respectively. At lower temperatures, the fields α and γ are separated by a relatively wide two-phase field ( α+ γ) which extends over the range 0.37< z<0.76. Values of room-temperature optical energy gap E o were determined from optical absorption measurements in the ranges of single-phase behaviour, and the form of the E o vs. z data curve is discussed. The form of this T(z) diagram is compared with those of related systems in which the terminal compounds have similar structure but differ in space group.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call