Abstract
A new selenide of the ternary system Ga–Cr–Se has been obtained by chemical transport reactions. Single crystals of the pseudobinary compound (Ga 2Se 3) 3 x –(Cr 2Se 3) 1− x with x=0.333, are trigonal and have the unit cell of dimensions a=3.781(1), c=46.807(9) Å, V=579.5(1) Å 3 with Z=3 in the hexagonal setting of space group R3. The compound has been characterised as to the crystal structure and composition related to the magnetic properties and electric transport behaviour. The structure can be described as a close packed hexagonal arrangement of selenium ions, forming layers perpendicular to the c-axis. The cations occupy tetrahedral and octahedral voids between the layers. Along the c-axis there is a repetition c/3 with five symmetrically different layers. The sequence of the layers results from the metal vacancies having also impact on the properties of the crystal. The temperature dependence of the magnetic susceptibility obeys the Curie–Weiss law with positive θ C− W =137.7 K, pointing to ferromagnetic interactions. Nevertheless, no evident magnetic transition was found down to 4.2 K, and also a thermomagnetic effect was not observed. There was no saturation of magnetisation at 4.2 K in a stationary field of 150 kOe; the moment has scarcely reached the value μ=2.0 μ B/Cr 3+. The electrical transport measurements showed the compound to be the p-type semiconductor.
Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
