847 results about "Monoclinic crystal system" patented technology

The present invention provides a lithium composite metal oxide containing Li and at least one transition metal element, wherein at least one lithium composite metal oxide particle constituting the lithium composite metal oxide has both hexagonal and monoclinic crystal structures. Further, the present invention also provides a lithium composite metal oxide containing Li, Ni and M (where, M represents one or more kinds of transition metal elements selected from the group consisting of Mn, Co and Fe), having a diffraction peak (diffraction peak A) at an angle 2θ in a range from 20° to 23° in a powder X-ray diffraction pattern of a lithium composite metal oxide which is obtained by powder X-ray diffraction measurement made in the condition that CuKα is used as a radiation source and the measurement range of diffraction angle 2θ is in a range from 10° to 90°.

The invention belongs to the technical field of high-performance medical alloy materials and particularly relates to a medical zirconium alloy high in surface wear resistance and integral tenacity and a preparation method and application thereof. The surface of the medical zirconium alloy is provided with a micron-level thick oxide ceramic layer is mainly composed of nonoclinic-system zirconia and a small amount of tetragonal-system zirconia; the matrix of the medical zirconium alloy is zirconium alloy, which is specifically composed of, by weight percentage, 76.5-100 wt.% of Zr, 0-19 wt.% of Nb, 0-4.5 wt.% of Hf and inevitable trace impurities as balance; an oxygen-enriched transition layer is arranged between the oxide ceramic layer and the matrix alloy, namely, oxygen is dissolved inside the matrix to form zirconium-oxygen solid solution. The high-wear-resistance and high-tenacity medical zirconium alloy combines the plastic deformation technology and the high-temperature oxidation technology and greatly improves the surface hardness, the wear resistance and the alloy strength, thereby having a broad application prospect in biomedicine, particularly in the aspect of biomedical implants.

The invention discloses a compound barium borofluoride, a barium borofluoride non-linear optical crystal, and a preparation method and a use of the barium borofluoride non-linear optical crystal. The compound barium borofluoride and the barium borofluoride non-linear optical crystal have the same chemical formula of Ba3B6O11F2. The barium borofluoride non-linear optical crystal belongs to a monoclinic system, has a space group P2(1), has cell parameters shown in the patent specification, wherein beta is equal to 101.351(4)deg., and has the molecular weight of 690.88. The powder frequency-doubling effect of the barium borofluoride non-linear optical crystal is 3 times that of KDP (KH2PO4). The compound barium borofluoride is synthesized by a solid-phase reaction method. The barium borofluoride non-linear optical crystal grows by a high-temperature melting method. The barium borofluoride non-linear optical crystal has large mechanical hardness, can be cut, polished and stored easily, and can be widely used in preparation of nonlinear optical devices such as a frequency multiplication generator, an upper frequency converter, a lower frequency converter and an optical parameter resonator.

A piezoelectric film element is provided, which is capable of improving piezoelectric properties, having on a substrate at least a lower electrode, a lead-free piezoelectric film, and an upper electrode, wherein at least the lower electrode out of the lower electrode and the upper electrode has a crystal structure of a cubic crystal system, a tetragonal crystal system, an orthorhombic crystal system, a hexagonal crystal system, a monoclinic crystal system, a triclinic crystal system, a trigonal crystal system, or has a composition in which one of these crystals exists or two or more of them coexist, and crystal axes of the crystal structure are preferentially oriented to a specific axis smaller than or equal to two axes of these crystals, and a ratio c / a′ is set in a range of 0.992 or more and 0.999 or less, which is the ratio of a crystal lattice spacing c in a direction of a normal line to the substrate surface, with respect to a crystal lattice spacing a′ whose inclination angle from the substrate surface is in a range of 10° or more and 30° or less.

An actuator device includes: a layer provided on a single crystal silicon (Si) substrate, and made of silicon dioxide (SiO2); at least one buffer layer provided on the layer made of silicon dioxide (SiO2); a base layer provided on the buffer layer, and made of lanthanum nickel oxide (LNO) having the (100m) plane orientation; and a piezoelectric element. The piezoelectric element includes: a lower electrode provided on the base layer, and made of platinum (Pt) having the (100) plane orientation; a piezoelectric layer made of a ferroelectric layer whose plane orientation is the (100) orientation, the piezoelectric layer formed on the lower electrode by epitaxial growth where a crystal system of at least one kind selected from a group consisting of a tetragonal system, a monoclinic system and a rhombohedral system dominates the other crystal systems; and an upper electrode provided on the piezoelectric layer.

A rare earth-based core for use in the casting of a reactive metal is described. The core contains a ceramic composition which includes at least about 10% by weight of monoclinic rare earth aluminate (RE4Al2O9), wherein RE represents at least one rare earth element; and at least about 10% by weight of at least one free rare earth oxide. The ceramic phase of the composition may include a microstructure which comprises a multitude of substantially spherical pores which are formed as a result of the removal of aluminum metal from the core composition during a heat treatment step. Additional embodiments relate to a method for the fabrication of a ceramic core, employing a rare earth oxide, aluminum metal, and a binder. Methods for removing cores from a cast part are also described.

The invention discloses a visible light catalyst BiVO4 and a preparation method thereof. The BiVO4 is powder, the crystalline phase is monoclinic crystal serial scheelite structure, and the feature thereof is in a three-dimensional connected pore channel structure. In the preparation method, ethanediol is utilized as solvent, and bismuth salt and vanadium salt are respectively used as a Bi source and a V source for preparing the three-dimensional connected pore channel structural BiVO4. The preparation method is as follows: dissolving bismuth salt and vanadium salt into ethanediol according to the proportion that Bi / V equals to 1:0.5-1:2 to prepare solution the Bi ion concentration of which is 0.05-0.5mol.L<-1>; forming even settled solution, and then transferring the settled solution to a constant-temperature water bath tank of 50-90 DEG C to preserve heat for 2-10 days; and after obtaining flocks, centrifuging, washing, drying and finally calcining obtained powder at the temperature of 350-600 DEG C for 1-3h in air environment. In the invention, no surfactant is utilized, and the catalyst with novel structure and very large specific surface area is obtained after simple heat preservation in the water bath tank and later-stage low temperature heat treatment. The catalyst has smaller particles and higher photocatalysis activity, thus being applied to degrading organic pollutants by visible light catalyst.

An electrode active material comprising in major proportions a monoclinic titanium-niobium composite oxide represented by the formula TiNbxO(2+5x / 2), wherein X is from 1.90 or more to less than 2.00.