Jiyue Song

Bio: Jiyue Song is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Seebeck coefficient & Electrical resistivity and conductivity. The author has an hindex of 6, co-authored 9 publications receiving 102 citations. Previous affiliations of Jiyue Song include University of Science and Technology of China.

Reentrant spin glass behavior and magnetodielectric coupling of an Ir-based double perovskite compound, La2CoIrO6.

Abstract: The structural, magnetic, electrical and dielectric properties of an Ir-based double perovskite compound, La2CoIrO6, have been investigated. The sample undergoes a paramagnetic-ferromagnetic transition at TC, followed by a reentrant spin-glass transition at lower temperatures. The reentrant spin glass state in La2CoIrO6 is associated with the competitions of the antiferromagnetic coupling between Ir4+ and Co2+ ions and the ferromagnetic clusters. La2CoIrO6 shows a semiconducting transport behavior in the temperature range 65 to 360 K and the transport behavior can be well described by the three-dimensional Mott variable range hopping conduction mechanism. Moreover, a strong frequency dependence of dielectric constant behavior for La2CoIrO6 is observed and the dielectric relaxation can be ascribed to the electron hopping between different transition metal ions. In addition, the isothermal magnetic field dependent dielectric constant measurements show that a clear magnetodielectric coupling effect exists in La2CoIrO6 at low temperatures.

Optimization of Rate Capability and Cyclability Performance in Li 3 VO 4 Anode Material through Ca Doping.

Abstract: A series of Ca-doped lithium vanadates Li3-x Cax VO4 (x=0, 0.01, 0.03, and 0.05) are synthesized successfully through a simple sol-gel method. XRD patterns and energy-dispersive X-ray spectroscopy (EDS) mappings reveal that the doped Ca2+ ions enter into the lattice successfully and are distributed uniformly throughout the Li3 VO4 (LVO) grains. XRD spectra and SEM images show that Ca doping can lead to an enlarged lattice and refined Li3 VO4 particles. A small quantity of V ions will transfer from V5+ to V4+ in the Ca-doped samples, as demonstrated by the X-ray photoelectron spectroscopy (XPS) analysis, which leads to an increase of an order of magnitude in the electronic conductivity. Improved rate capability and cycling stability are observed for the Ca-doped samples, and Li2.97 Ca0.03 VO4 exhibits the best electrochemical performance among the studied materials. The initial charge/discharge capacities at 0.1 C increase from 480/645 to 527/702 mA h g-1 as x varies from 0 to 0.03. The charge capacity of Li2.97 Ca0.03 VO4 at 1 C retains 95.3 % of its initial value after 180 cycles, whereas the capacity retention is only 40 % for the pristine sample. Moreover, Li2.97 Ca0.03 VO4 maintains a high discharge capacity of 301.7 mA h g-1 at a high discharge rate (4 C), whereas the corresponding value is only 95.2 mA h g-1 for the pristine LVO sample. The enhanced cycling and rate performances are ascribed to the increased lithium ion diffusivity and electrical conductivity induced by Ca doping.

Three-Dimensional Porous Hierarchically Architectured Li3VO4 Anode Materials for High-Performance Lithium-Ion Batteries

Abstract: In this work, a binder-free, self-supported, three-dimensional (3D), porous Li3VO4 (LVO) and the carbon-coated Li3VO4(LVO@C) anode materials are prepared on a Ni-foam disc by the electrostatic spra...

The effects of quenching on electrical properties, and leakage behaviors of 0.67BiFeO 3 –0.33BaTiO 3 solid solutions

Abstract: Ferroelectric solid solutions of 0.67BiFeO3–0.33BaTiO3 were prepared by a Pechini method followed by quenching process. The XRD results indicate that both the furnace-cooled and water-quenched samples are consist of rhombohedral and tetragonal phases. SEM images show that the quenching process does not change the microstructure of 0.67BiFeO3–0.33BaTiO3 solid solutions. The quenched sample exhibits well-defined P–E hysteresis loop with remnant polarization of 23 µC/cm2 at room temperature. The leakage mechanism of the furnace-cooled sample is Ohmic conduction mechanism, whereas the leakage mechanism of water-quenched sample is predominated by field-assisted ionic conduction at room-temperature and 50 °C and then changes to three different conduction mechanisms at 100 °C.

Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite T b 2 CoMn O 6

Abstract: We investigated the anisotropy of the magnetic and magnetocaloric properties of single-crystalline double-perovskite $\mathrm{T}{\mathrm{b}}_{2}\mathrm{CoMn}{\mathrm{O}}_{6}$, which crystallizes in a monoclinic $P{2}_{1}/n$ structure. Due to dissimilar magnetic anisotropy, the ferromagnetic order of the $\mathrm{C}{\mathrm{o}}^{2+}$ and $\mathrm{M}{\mathrm{n}}^{4+}$ moments emerges along the $c$ axis at ${T}_{\mathrm{C}}=100\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and the larger $\mathrm{T}{\mathrm{b}}^{3+}$ moments align perpendicular to the $c$ axis, below ${T}_{\mathrm{Tb}}=15\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. The intricate temperature development of the metamagnetism along the $c$ axis results in a large negative change in the magnetic entropy at low temperature. On the other hand, the larger but almost reversible magnetization, perpendicular to the $c$ axis, results in a small and positive entropy change. This highly anisotropic magnetocaloric effect (MCE) leads to a giant rotational MCE, estimated to be $20.8\phantom{\rule{0.16em}{0ex}}\mathrm{J}/\mathrm{kg}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Our findings, based on the magnetic anisotropy in $\mathrm{T}{\mathrm{b}}_{2}\mathrm{CoMn}{\mathrm{O}}_{6}$, enrich fundamental and applied research on magnetic materials, considering the distinct magnetic characteristics of double perovskites.