48 results about "Rhombohedron" patented technology

The first object of the invention is to provide means that enables a perovskite oxide thin film having (100) orientation, (001) orientation or (111) orientation to be easily obtained, and the second object of the invention is to provide a multilayer thin film comprising a unidirectionally oriented metal thin film of good crystallinity. The multilayer thin film according to the first embodiment of the invention comprises a buffer layer and a perovskite oxide thin film present thereon. The interface between the buffer layer and the perovskite oxide thin film is made up of a {111} facet plane. Substantially parallel to the facet plane there is present a {110} face of a cubic, rhombohedral, tetragonal or orthorhombic crystal of the perovskite oxide thin film, a {101} face of the tetragonal or orthorhombic crystal or a {011} face of the orthorhombic crystal. The multilayer thin film according to the second embodiment of the invention comprises a metal thin film that is a cubic (100) unidirectionally oriented epitaxial film, and a buffer layer where a {111} facet plane is present on the interface of the buffer layer in contact with the metal thin film.

There is provided a piezoelectric film having an alkali niobate-based perovskite structure expressed by a general formula (Na_xK_yLi_z)NbO₃(0≦x≦1, 0≦y≦1, 0≦z≦0.2, x+y+z=1), wherein the alkali niobate has a crystal structure of a pseudo-cubic crystal, a tetragonal crystal, an orthorhombic crystal, a monoclinic crystal, a rhombohedral crystal, or has a crystal structure of coexistence of them, and when total of K—O bonding and K-Metal bonding is set as 100% in a binding state around K-atom of the alkali niobate, a K—O bonding ratio is 46.5% or more and a K-Metal bonding ratio is 53.5% or less, wherein the Metal indicates a metal atom included in the piezoelectric film.

The invention discloses a preparation method of petal-shaped nano-magnesium oxide by using dolomite. According to the preparation method, high purity nano-magnesium oxide with a rhombohedron-layer petal-like structure can be achieved by directly using dolomite which takes high-yield mineral as a raw material and by the way of combining the Sec acid leaching method and EDTA-ammonia complexion and precipitation reaction. With low preparing cost and simple process, the invention solves the problem that the mid-outcome nano-magnesium hydroxide is precipitant and is difficult to be filtered. the MgO produced by adopting the invention has the rhombohedron-layer petal-like structure which is in regular arrangement and epitaxial radial growth; and the purity of the produce is more than 99.83 percent; and the ration of the surface area is 114.37 m<2>/g, and 50 percent larger than ordinary Nano-magnesium products; the white degree is more than 97 percent, and is same to that of the high-quality titanium pigment; the purity of the by-product calcium chloride is more than 98.86 percent; and the purity of ammonium nitrate is more than 99.85 percent.

The invention belongs to the field of electronic ceramic material and manufacturing of electronic ceramic material, and more specifically relates to a composite system LTCC material, and a preparation method thereof. The general chemical formula of the composite system LTCC material is Li<2x>(Zn<0.96>Co<0.05>)<2-x>SiO<4-y>LMZBS (0.125<=x<=0.375, and y ranges from 1 to 2wt%); the principal crystalline phase is (Zn,Co)<2>SiO<4> with a rhombohedron structure; the secondary crystalline phase is Li<1.6>Zn<1.2>SiO<4> with an orthorhombic system structure; the composite system LTCC material is prepared via low temperature sintering at 900 to 950 DEG C; the dielectric constant epsilon<r> ranges from 6.1 to 6.5; the Q*f value is higher than 130000GHz, and the highest Q*f value is 230602GHz; the temperature coefficient of resonance frequency tau<f> ranges from -41 to -22ppm/DEG C. The raw materials are cheap; the preparation method is simple; operation is convenient; production cost is low; and the composite system LTCC material is capable of reducing the loss of microwave devices or modules as a LTCC microwave medium or device.

The invention relates to an obstructive piston type particle damper. According to the technical scheme, the lower portion of a guide rod (8) is fixedly connected with a screw hole in the closed end of a damper shell (3) through a thread, and the lower end of the guide rod (8) is fixedly connected with a base through a thread. The upper end of a piston rod (1) penetrate a cover plate (6) and a damper cover (2) to be connected with an external mechanical vibrating system, and the upper portion of the guide rod (8) is movably sleeved with the lower portion of the piston rod (1). A cavity below the cover plate (6) is filled with particle damping materials (7). The piston rod (1) is a whole formed by a rod body and a rotary body, and the rotary body is a sphere or a spheroid or a rhombohedron. A round hole is formed in the lower end face of the piston rod (1) inwards along the axis, and the diameter of the round hole and the guide rod (8) are in clearance fit. The obstructive piston type particle damper is simple and reliable in structure, convenient to manufacture, low in cost, stable in damping effect and wide in application range, can generate large damping and adjust the magnitude of the damping, is suitable for vibration attenuation of periodic vibrating equipment, and is also suitable for vibration attenuation of impact vibrating equipment.

The invention discloses a cutting method for a free-space photoisolator chip body. The free-space photoisolator chip body comprises a first plane as a light emitting surface of light and a second plane perpendicular to the first plane. The cutting method is characterized in that the cutting method comprises the following steps : A, cutting the chip body in the direction parallel to the second plane by using a blade and cutting the chip body into a plurality of chip strips; B, turning various chip strips into 90 degrees or 270 degrees by using long sides of the chip strips as axes; C, rotating each blade or each chip strip around the axis perpendicular to the second plane at an angle of 6 to 10 degrees; and D, cutting the chip strips in the direction perpendicular to the second plane by using the blade to form a plurality of rhombohedrons. According to the cutting method disclosed by the invention, the utilization rate of a photoisolator chip material can be effectively increased while the chip with low reflection of the photoisolator is obtained.

A recording material comprising a support and a thermosensitive element containing silver stearate, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the silver stearate is not associated with mercury and/or lead ions and when the recording material is irradiated with a copper K alpha 1 X-ray source the ratio of the sum of the peak heights of the X-ray diffraction lines attributable to silver stearate at Bragg angles, 2 THETA , of 2 THETA , of 3.62 DEG , 5.45 DEG , 7.30 DEG , 9.04 DEG , 10.97 DEG and 12.71 DEG to the sum of the peak heights of the X-ray diffraction lines at Bragg angles, 2 THETA , of 25.60 DEG , 35.16 DEG and 43.40 DEG of NIST standard 1976, rhombohedral Al2O3, determined with the same X-ray diffractometer in the same state of adjustment on a sample of the recording material and a sample of the NIST standard 1976 cut to fit a sample holder of the X-ray diffractometer, divided by the square root of the quantity of silver in the recording material, expressed in g per m2, is greater than 2.2 m/g0.5; and a process for producing particles of substantially light-insensitive organic silver salt comprising silver stearate with these X-ray characteristics in the substantial absence of organic solvent.

The invention provides an improved electric car structure. The improved electric car structure comprises a car frame on the front portion of a car body. A transverse supporting board is fixed to the lateral portion of the car frame of the front portion of the car body. A charging socket is embedded in the middle of the supporting board. An energy storage device is arranged on the car frame on the front lateral portion of the car body and electrically connected with electric equipment and the charging socket through lines. In addition, a car frame range extender damping device is improved; the charging socket of the improved structure is arranged in a forecabin; the layout of a charging circuit is optimized; the circuit is shortened; hidden dangers of high temperature ignition are eliminated; the cost is reduced; installation locations are reasonable due to the wide space; the charging socket is fixed more firmly due to the fixing mode. Meanwhile, the damping device is in a damper shape with the rhombohedron section, in this way, the shear stress principle is well utilized, vibration in a single direction can be dispersed to be in different directions, and the damping effect is greatly improved. By the adoption of the structure, the improved electric car structure is simple in process and low in cost compared with a traditional structure.

The invention relates to a method for forming a layer of single-phase oxide (30) (Fe, Cr)₂O₃ with a rhombohedral structure on a steel or super alloy substrate (10), comprising the following successive steps:

• • a) supplying a steel or super alloy substrate (10) covered with a surface layer, the steel comprising at least 2 wt.-% chromium;
  • b) removing the surface layer in an atomsphere containing at least 0.2 atm dioxygen, creating a level of micro-deformation in the crystal lattice of the steel or super alloy that is greater than 1.0.10⁻³, and a heating at a heating rate higher than 400° C./s, such as to form a layer of rhombohedral oxide (30) (Fe, Cr)₂O₃,
  • c) carrying out a thermal treatment, in the presence of air, at a water partial pressure of less than 10.000 ppm, and at a temperature varying between 400° C. and 1000° C., such as to grow the layer of rhombohedral oxide formed in step (b) to a thickness from 70 nm to 150 nm.

The invention provides a method for preparing a long-rhombohedron and short-column rhombohedron anhydrous magnesium carbonate mixture. The method is characterized by employing the following steps: adding MgCl2.6H2O and CH4N2O into distilled water according to a certain mass-mole ratio, so as to prepare a clear solution of a certain concentration; heating up the solution, and carrying out a pre-synthesis reaction for 1 to 2 hours at a reaction temperature of 80 DEG C to 95 DEG C; slowly adding NaOH into a pre-synthesis reacted mixed solution, and adjusting a pH value of the mixed solution to be11; transferring the mixed solution into a Teflon-lined stainless-steel reactor, and carrying out a hydrothermal reaction for 4 to 6 hours at a temperature of 140 DEG C to 150 DEG C; and subjecting aproduct to negative-pressure filtering, washing and baking after the hydrothermal reaction is completed, thereby obtaining anhydrous magnesium carbonate, wherein the anhydrous magnesium carbonate isformed through mixing two kinds of crystals of different morphologies, one kind of crystals are long rhombohedra, the other kind of crystals are short column rhombohedra, and both kinds belong to a trigonal crystal system, the long-rhombohedron anhydrous magnesium carbonate crystals have the diameter of 10 to 20 microns and the length of 25 to 50 microns, and the short-column-rhombohedron anhydrous magnesium carbonate crystals have the diameter of 15 to 20 microns and the length of 20 to 25 microns.

A functionally graded carbide body (400) can include a group 5 metal carbide substrate having a bulk composition region (410) that contains at least 70 wt% of a rhombohedral [zeta]-phase carbide. A [gamma]-phase-rich region (420) having a [gamma]-phase-rich composition can be at a surface (430) of the substrate, and a phase composition gradient region (440) can transition from the [gamma]-phase-rich composition region at the surface to the bulk composition region at a gradient depth (450) below the surface.

The invention is applicable to the technical field of sensors and provides a nano material, a synthesis method thereof, a gas sensor, a preparation method and applications of the gas sensor. The synthesis method of the nano material comprises the following steps: dissolving ferric nitrate, polyvinylpyrrolidone and sodium acetate in a mixed solvent, and carrying out a hydrothermal reaction at a temperature of 160-220 DEG C to obtain a reactant; carrying out suction filtration separation on the reactant to obtain a solid; and washing and drying the solid, and calcining the solid at the temperature of 450-500 DEG C to obtain a nano material with the rhombohedral structure. A gas sensor for detecting the concentration of ethanol gas can be prepared by depositing the nano material between sensing electrodes of a sensor chip. The gas sensor based on the nano material has the advantages of lower power consumption, ultrafast response/recovery characteristic to low-concentration ethanol gas, good selectivity and stability to the ethanol gas and the like.