Abstract:
The invention relates to a fully dense and ultrafine grained high temperature piezoelectric BiScO 3 -PbTiO 3 ceramic material of formula Bi 1-x+2y Pb x-3y Sc 1-x Ti x O 3 , wherein x ranges from 0.64 to 0.68 and y ranges from 0.01 to 0,025, which includes a point defect engineering for high voltage response and an optimized microstructure for enhanced fracture strength. Furthermore, the invention refers to a process for obtaining said piezoelectric ceramic material by hot pressing of nanocrystalline powders derived by mechanosynthesis from a stoichiometric mixture of precursors and to the use of said piezoelectric ceramic material as part of a sensing device. Moreover, the invention relates a magnetoelectric composite comprising said piezoelectric ceramic material and a magnetostrictive material, the process for obtaining said magnetoelectric composite and its use as part of a magnetic sensing device.
Abstract:
A furnace assembly includes first and second sections. The first section includes first and seconds ends, a first joint disposed at the first end, a conical portion at a second end, a first filter disposed between the first and second ends, and a lumen extending through the first section in fluid communication with the first filter. The second section includes first and second ends, a second joint disposed at the first end, an opening disposed at the second end and to receive the conical portion of the first section, a second filter disposed between the first and second ends, and a lumen extending through the second section in fluid communication with the second filter. When engaged, the first and second sections form a chamber between the first and second filters. The chamber is in fluid communication with the respective first ends of the first and second sections.
Abstract:
Provided is a lead-free piezoelectric material having satisfactory and stable piezoelectric constant and mechanical quality factor in a wide temperature range. The piezoelectric material includes a perovskite-type metal oxide (Ba 1-x Ca x ) a (Ti 1-y Zr y )O 3 , wherein 1.00 ‰¤ a ‰¤ 1.01, 0.125 ‰¤ x ‰¤ 0.300, 0.041 ‰¤ y ‰¤ 0.074, containing Mn and Mg. The Mn content is from 0.12 to 0.40 weight % of the perovskite-type metal oxide on a metal basis. The Mg content is less than 0.10 weight % of the perovskite-type metal oxide on a metal basis.
Abstract:
A proton conducting ceramic membrane comprising a conducting layer, wherein said conducting layer comprises a mixture of a rare-earth tungstate as herein defined and a mixed metal oxide as herein defined. The invention also relates to a reactor comprising said membrane and the use of said membrane in a dehydrogenation process.
Abstract:
A piezoelectric/electrostrictive film is a sintered body of a piezoelectric/electrostrictive ceramic composition. The piezoelectric/electrostrictive ceramic composition is a piezoelectric/electrostrictive composition, in which a compound of at least one kind of element selected from the group consisting of Ba, Sr, Ca, La, Ce, Nd, Sm, Dy, Ho and Yb and a Mn compound are contained in a perovskite-type oxide containing Li, Na and K as A-site elements and Nb and Sb as B-site elements, where a ratio of a total number of atoms of the A-site elements to a total number of atoms of the B-site elements is more than one and the number of atoms of Sb to the total number of atoms of the B-site elements is I mol% or more and 10 mol% or less.
Abstract:
Because fracture toughness and translucency of translucent colored alumina sintered body of the past were low, the alumina sintered body was not suitable for uses such as dental materials, which require high toughness. The present invention relates to providing a translucent colored alumina sintered body that contains transition metal oxides, and with which the fracture toughness is 4.5 MPa·m 0.5 or more and the maximum value of total forward transmittance (sample thickness 1mm) to a wavelength of 300-800nm is 60% or more. The present invention relates to obtaining a sintered body, at least 20% of which contains anisotropic grains with a long axis length of 10µm or greater and an aspect ratio of 1.5 or more by subjecting an alumina sintered body containing transition metal oxides having a eutectic point with alumina or an alumina sintered body containing transitional metal oxides and at least one selected from the group consisting of Group 1A alkali metal oxides, Group 2A alkaline earth metal oxides, and SiO 2 , B 2 O 3 , P 2 O 5 and GeO 2 to pressureless sintering and HIP treatment.
Abstract:
Provided is a barium titanate-based semiconductor ceramic composition which contains no Pb, which can have an increased Curie temperature, which exhibits slight deterioration with time, and which has high reliability. The barium titanate-based semiconductor ceramic composition is represented by the composition formula (Ba 1-x-y-z Sr y (A1Bi) x A2 z )TiO 3 , where A1 is an alkali metal element, A2 is a rare-earth element, and x, y, and z satisfy the following inequalities 0.03 ‰¤ x ‰¤ 0,20, 0.02 ‰¤ y ‰¤ 0.20, 0.0005 ‰¤ z ‰¤ 0.015, and x - 0.10 ‰¤ y ‰¤ (5 / 4)·x. In addition, 0.01 to 0.20 molar parts of Mn per 100 molar parts of Ti is preferably added thereto.
Abstract:
A piezoelectric material comprises crystal grains of a perovskite-type metal oxide represented by general formula (1) as a main component, (Ba 1-x Ca x ) a (Ti 1-y Zr y )O 3 (where 1. 00 ≤ a ≤ 1.01, 0.020 ≤ x ≤ 0.300, 0.020 ≤ y ≤ 0.095, and y ≤ x) (1), and a manganese component, wherein a manganese content incorporated in the piezoelectric material relative to 100 parts by weight of the perovskite-type metal oxide is 0.02 parts by weight or more and 0.30 parts by weight or less on a metal basis.
Abstract:
Provided is a lead-free piezoelectric ceramic composition having high piezoelectric properties. The lead-free piezoelectric ceramic composition fulfils a molar ratio (Na/K) for Na (sodium) and K (potassium) in the main phase thereof of 0.40 direction when the main phase is expressed as a pseudo cubic crystal. The area ratio of the crystal phase reflecting the second spot group in the main phase is no more than 33% and the maximum particle diameter of the crystals reflecting the second spot group in the main phase is no more than 25 nm.
Abstract:
To provide a dental temporary calcined body including an inside colored by a coloring material wherein, the inside of the dental temporary calcined body is colored by a coloring liquid containing the coloring material and a penetrant containing a permeating liquid.