A FeNi ordered alloy includes a plurality of particles having a L1.sub.0 type ordered structure. A size of the particles is in a range between 200 nm and 500 nm. A volume fraction of a pore in the particles with respect to a volume of the particles having an unit of vol. % is 5% or less.

The present application provides a positive electrode sheet for a secondary battery, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer on a surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a first lithium nickel transition metal oxide and a second lithium nickel transition metal oxide, the first lithium nickel transition metal oxide includes a first substrate and a first coating layer on a surface of the first substrate, the first substrate is secondary particles, and the second lithium nickel transition metal oxide is a single crystal or single-crystal-like morphological particles.

The present application provides a positive electrode sheet for a secondary battery, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer on a surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a first lithium nickel transition metal oxide and a second lithium nickel transition metal oxide, the first lithium nickel transition metal oxide includes a first substrate and a first coating layer on a surface of the first substrate, the first substrate is secondary particles, and the second lithium nickel transition metal oxide is a single crystal or single-crystal-like morphological particles.

The present disclosure provides a graphene based dry electrode for electrophysiological readings, in particular for use with EEG, EKG, EMG, and EOG systems and a method for making said electrodes. The electrodes comprising a doped silicon substrate; a silicon carbide film on the substrate; a graphene surface on the silicon carbide film; wherein the graphene surface has undergone a functionalisation and/or intercalation process to increase the amount of oxygen functional groups present, said process being preferably carried out through repeated contact of the graphene surface with an electrolyte solution.

The present disclosure provides a graphene based dry electrode for electrophysiological readings, in particular for use with EEG, EKG, EMG, and EOG systems and a method for making said electrodes. The electrodes comprising a doped silicon substrate; a silicon carbide film on the substrate; a graphene surface on the silicon carbide film; wherein the graphene surface has undergone a functionalisation and/or intercalation process to increase the amount of oxygen functional groups present, said process being preferably carried out through repeated contact of the graphene surface with an electrolyte solution.

A thermoelectric conversion material according to an embodiment is expressed by the following formula (1):
(M.sup.1.sub.1-xM.sup.2.sub.x).sub.4Si(Te.sub.1-yM.sup.3.sub.y).sub.4 (1) wherein M.sub.1 represents Ta or Nb, M.sup.2 is at least one element selected from a group consisting of elements of groups 4 to 12 in the periodic table, M.sup.3 is at least one element selected from a group consisting of As, Sb, Bi, Sn and Pb, 0x<0.02, 0y<0.02, and M.sup.2 is an element different from M.sup.1 when 0<x.

The present invention relates to compounds and their nonlinear optical (NLO) crystals of A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs), their producing method and uses thereof. A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs) belong to triclinic crystal system, and have a space group of P1, crystal cell parameters of a=6.284(8)-8.784(3) , b=6.338(3)-8.838(3) , c=6.463(3)-8.963(3) , =70-105, =75-106, =76-107 and Z=1 and a unit cell volume of V=257.4(3)-696.0(6) .sup.3. A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs) compounds were prepared by a high-temperature solid-state reaction method or a hydrothermal method, and A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs) NLO crystals were prepared by a high-temperature solid-state reaction method, a hydrothermal method or a solution method. These materials can be used to manufacture second harmonic generator, up-down frequency converter, optical parametric oscillator, etc.

The present invention relates to compounds and their nonlinear optical (NLO) crystals of A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs), their producing method and uses thereof. A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs) belong to triclinic crystal system, and have a space group of P1, crystal cell parameters of a=6.284(8)-8.784(3) , b=6.338(3)-8.838(3) , c=6.463(3)-8.963(3) , =70-105, =75-106, =76-107 and Z=1 and a unit cell volume of V=257.4(3)-696.0(6) .sup.3. A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs) compounds were prepared by a high-temperature solid-state reaction method or a hydrothermal method, and A.sub.3B.sub.11P.sub.2O.sub.23 (A=K, Rb, Cs) NLO crystals were prepared by a high-temperature solid-state reaction method, a hydrothermal method or a solution method. These materials can be used to manufacture second harmonic generator, up-down frequency converter, optical parametric oscillator, etc.

The present invention relates to: layered iron arsenide (FeAs), which is more particularly layered FeAs, which, unlike the conventional bulk FeAs, has a two-dimensional (2D) crystal structure, has the ability to be easily exfoliated into nanosheets, and has superconductivity; a method of preparing the same; and a FeAs nanosheet exfoliated from the same.

A method for forming a crystalline material having an anisotropic, quasi-one-dimensional crystal structure is disclosed. In various embodiments, the method includes: mixing a plurality of precursor materials together to form a combined precursor material, the plurality of precursor materials including a transition-metal ion or a main group ion and at least one of an alkaline earth ion or an alkali metal ion; and reacting the combined precursor material to obtain the crystalline material, the crystalline material having a formula ABX3, wherein A is the at least one of the alkaline earth ion or the alkali metal ion and B is the transition-metal ion surrounded by six anions (X), and wherein the quasi-one-dimensional anisotropic crystal provides a birefringence of at least 0.03, defined as the absolute difference in the real part of the complex-refractive-index values along different crystal axes, in at least a portion of one or N both of the visible-wave spectrum or the infrared spectrum.