Shape-controlled solution synthesis of ferromagnetic copper chromium selenide (CuCr2Se4) crystallites

Compound Copper Chalcogenide Nanocrystals

“…For example, magnetic measuremernts of CuCr 2 Se 4 NCs (synthesized from microwave radiation) showed a saturation magnetization of 15 emu g −1 and a coercive force of 80 Oe at room temperature. − In another report, agglomerated CuCr 2 Se 4 NCs (particle sizes between 25 and 200 nm) were formed in a solvothemal synthesis approach, in which a Curie temperature of 450 K presented saturation magnetization of 2.3 μ B per Cr atom at 5 K . Similar results were also reported by Rao et al A colloidal approach reported by Wang et al allowed for much better size control of the resultant CuCr 2 Se 4 NCs, in which hysteresis loops for NCs, with an average size of 15 and 25 nm, were measured at 300 and 10 K, respectively . In this report, both samples were observed to be superparamagnetic at room temperature but exhibited relatively low coercivity at 10 K, with saturation magnetization values of 37 emu/g and 43 emu/g being reported for the 15 and 25 nm sized NCs, respectively.…”

Magnetic properties of chalcogenide spinel CuCr2Se4 nanocrystals

“…The measured M S values are also somewhat lower than that reported for sub-micron size CuCr 2 Se 4 particles prepared by solvothermal and thermolysis methods [25,26]. A seen in Fig.…”

Chemical Manipulation of Magnetic Ordering in Mn1–xSnxBi2Se4 Solid–Solutions

“…There is a fast growing interest in exploiting the low crystal symmetry as well as the structural diversity and flexibility associated with multinary metal chalcogenides to design novel multifunctional materials and to chemically manipulate interactions between coexisting functionalities. − The renewed interest in this family of compounds has been motivated by a continuing discovery of a large number of synthetic and natural metal chalcogenides exhibiting a tremendous variety of physical properties. − In addition, multinary metal chalcogenides are generally used in next-generation technologies such as thermoelectrics, , nonlinear optics, , photoelectronics, and solid-state electrolytes. , One fascinating feature of multinary heavy main-group metal chalcogenides is their ability to form homologous series of closely related structures. ,,,− The size, shape and chemical composition of various structural subunits building the three-dimensional structure of these homologous series of structures can generally be manipulated independently making the engineering of the physical properties of local crystal atomic sublattices possible. The application of this concept resulted in the formation of regularly spaced subdomains with distinct functionalities within a single crystal structure. ,, For example, we recently demonstrated that the crystal chemistry of Pb 4 Sb 4 Se 10 , the selenium analogue of the mineral cosalite, can be manipulated to create ordered magnetic subdomains, with increasing structural and chemical complexity, periodically dispersed within the three-dimensional framework of Pb, Sb and Se.…”