Novel single-crystal's voltage-dependent effect and magnetic order of Ln2ZrQ5 (Ln = La, Sm, Gd; Q = S, Se) semiconductors

Abstract

A series of rare-earth zirconium chalcogenides Ln(2)ZrQ(5) (Ln = La, Sm, Gd; Q = S, Se) synthesized by using boron as the reducing reagent show unprecedented single-crystal's intrinsic voltage-dependent effects and order antiferromagnetically.

Crystal and electronic structures, and optical and magnetic properties of novel rare-earth sulfide borates RE3S3BO3 (RE = Sm, Gd)

“…S1 and S3 atoms connect with five Gd atoms to form SGd 5 tetragonal pyramid units, respectively, while the S2 atom connects with five Gd atoms to construct a SGd 5 trigonal bipyramid unit. The Gd-S bond distances in 1 are in the range of 2.752(4)-3.091(4) Å, which are normal Gd-S distances and can be exemplified by many known compounds, like 2.830(1)-2.976(1) Å in Gd 2 ZrS 5 14 and 2.774(2)-3.002(2) Å in Gd ). 19 According to the evaluation of bond valence sums, 20 each atom's oxidation state is evaluated to be 3.256 (Gd1), 3.175 (Gd2), 2.902 (Gd3), 2.911 (B1), À2.047 (S1), À2.041 (S2), À2.146 (S3), À2.080 (O1), À2.032 (O2) and À1.898 (O3), so their oxidation states can be assigned as +3, +3, À2 and À2 for Gd, B, S and O atoms in view of the small evaluation errors (all less than 10%), respectively.…”

“…Its magnetic susceptibility shows Van Vleck-type paramagnetism, which is typical for Sm 3+ compounds as the effective magnetic moment is temperaturedependent. 14,24 Different from 1, no magnetic transition of 2 can be found down to the attainable lowest temperature of 2 K.…”

Ba2AsGaSe5: A New Quaternary Selenide with the Novel [AsGaSe5]4– Cluster and Interesting Photocatalytic Properties

“…Low-dimensional structures are of great interest due to their intriguing structures and important electrical, optical, and magnetic properties. − From a structural point of view, low-dimensional structures result from the coexistence and separation of several building units with different bonding nature (covalent, ionic, or van der Waals) in one compound. The interplay of these different bonding units gives the materials unique properties.…”

Rational Band Design in Metal Chalcogenide Ba6Zn6HfS14: Splitting Orbitals, Narrowing the Forbidden Gap, and Boosting Photocatalyst Properties

“…Compared with ZnS in three-dimensional network structure, Ba 6 Zn 6 HfS 14 has a lower dimensional structure. Meanwhile, it is reported that the low-dimensional structure has interesting constructions and important electrical, optical, as well as magnetic properties. − Theoretically, a low dimensionally ordered structure facilitates efficient electron and hole directional transportation and separation. Besides, a proper frequency band arrangement drives electrons and holes to the steadiest energy condition, leading to space charge separation and the photocatalytic behavior of the bulkier substance.…”