Yu‐Biao Chen

Hydrothermal synthesis and crystal structure of a layered vanadium phosphate with a directly coordinated organonitrogen ligand: [V4O7(HPO4)2(2,2′-bipy)2]

A layered vanadium phosphate [V4O7(HPO4)2(2,2′-bipy)2] was synthesized and characterized (elemental analysis, IR and thermal analysis) by the hydrothermal reaction of NaVO3·2H2O, ZnO, H3PO4, 2,2′-bipy and water. The compound [V4O7(HPO4)2(2,2′-bipy)2] exhibits a unique 4,6,8-net structure with organonitrogen donors of 2,2′-bipy ligands coordinated directly to the vanadium phosphate framework.

In-situ observation of self-regulated switching behavior in WO3-x based resistive switching devices

The transmittance of tungsten oxides can be adjusted by oxygen vacancy (Vo) concentration due to its electrochromic property. Here, we report an in-situ observation of resistive switching phenomenon in the oxygen-deficient WO3-x planar devices. Besides directly identifying the formation/rupture of dark-colored conductive filaments in oxide layer, the stripe-like WO3-x device demonstrated self-regulated switching behavior during the endurance testing, resulting in highly consistent switching parameters after a stabilizing process. For very high Vos mobility was demonstrated in the WO3-x film by the pulse experiment, we suggested that the electric-field-induced homogeneous migration of Vos was the physical origin for such unique switching characteristics.

Di­chloro­[2,2′‐hydroxy­(ethoxy)­methyl­enedi­pyridine‐κ2N,N′]­palladium(II)

In the title complex, [PdCl2(C13H14N2O2)], the central PdII atom is bonded to two pyridine N atoms and two terminal Cl atoms. The coordination geometry of the Pd atom is square planar with a slight tetrahedral distortion. The two Pd—N distances are 2.029 (3) and 2.057 (3) A, and the N—Pd—N angle is 86.56 (13)°. The Pd—Cl distances are 2.2929 (11) and 2.2959 (11) A, and the Cl—Pd—Cl angle is 90.84 (5)°.

One dimensional electron gas at the LaAlO3/SrTiO3 interface and its transport properties

Quasi-one-dimensional electron gases (q1DEGs) have been obtained by fabricating LaAlO3 nanowires, using the technique of electrostatic spinning plus post annealing, above TiO2-terminated SrTiO3 substrate. The q1DEG exhibits an electronic transport behavior of variable range hopping with the one dimension characteristic. Visible light illumination produces a strong effect on transport process, depressing the resistance of the q1DEG by a factor up to 8. As expected, gating effect is weak at relative high temperatures, ∼3.2% at 150 K and 1.5% at 300 K under a back gate of 200 V. Aided by light illumination, however, the gating effect is 35-fold amplified, and the resistance increases under not only negative gates but also positive gates, different from the normal gating effect without illumination. Possible explanations for these phenomena are given.

A conductive scanning study of La0.67Sr0.33MnO3/Nb:SrTiO3 hetero-junction

Basing on conductive atomic force microscopy, we presented a direct conductance mapping for the interface of the La0.67Sr0.33MnO3/Nb:SrTiO3 hetero-junction. The most remarkable observation is the presence of an interfacial layer in Nb:SrTiO3 adjacent to the manganite film. Within this layer, the AFM tip/Nb:SrTiO3 contact shows a current-voltage dependence that strongly deviates from Shockley equation, unlike a Schottky diode. Spatial extension of this layer is explored and possible transport mechanism in or outside this interfacial layer is discussed. The present work gives a direct intuitional image on the interface of manganite junction. The principle proven here can be extended to other complex oxide interfaces.

A new polymorph of tetraethyl­ammonium tris(μ-acetato-O,O′)­tri-μ-chloro-tri­chloro-μ3-oxo-triangulo-trimolybdenum

The title compound, [(C2H5)4N][Mo3Cl6O(C2H3O2)3], has been synthesized by the reaction of MoCl3·3H2O with CH3COOH. The structure is a polymorph of the structure reported by Chen, Lu, Huang, Huang & Huang [Chin. J. Struct. Chem. (1993). 12, 117–123]. The crystal contains discrete cations and anions. The mono-oxo-capped trinuclear Mo cluster anion consists of three Cl atoms and three acetate groups that bridge the three edges of the Mo triangle; each Mo atom is also coordinated by one terminal Cl atom. The coordination around Mo is a distorted octahedron.