Abstract: A piezoelectric ceramic composition that acquires excellent piezoelectric properties even when it is fired at a low temperature is offered. The piezoelectric ceramic composition possesses a composition corresponding to a solid solution that contains a first compound having a rhombohedral crystal-based perovskite structure, a second compound having a tetragonal crystal-based perovskite structure, and a third compound. The third compound is a compound oxide containing Bi as a first component element, Fe or Mn as a second component element, and a hexavalent metallic element as a third component element. The hexavalent metallic element is at least one kind selected from W and Mo.

Abstract: The present invention has an object to provide piezoelectric ceramics containing no lead, having a high Curie point, and further, having excellent piezoelectric properties, particularly large Qmax. The piezoelectric ceramics contain, as a main component, a bismuth layer-structured compound having (MII1-xLnx)Bi4Ti4O15 crystals (MII is an element selected from Sr, Ba, and Ca, Ln is an element selected from lanthanoids, and x is within a range of 0<x?0.5) and further contain, as secondary components, at least one of Mn oxide and Co oxide, and lanthanoid, wherein the lanthanoid being the secondary component is contained within a range of 0.02 to 0.12 wt % in terms of oxide thereof.

Abstract: A powder having a specific surface area of 1.8 to 11.0 m2/g was used as a powder to be sintered. Consequently, the powder has an improved sinterability, so that even by sintering at 1050° C. or lower, further at 1000° C. or lower, a piezoelectric ceramic having a high sintering density and desired piezoelectric properties can be obtained. The piezoelectric ceramic can have a main constituent represented by a composition formula (Pba1Aa2)[(Zn1/3Nb2/3)xTiyZrz]O3, wherein A represents at least one metal element selected from Sr, Ba and Ca, and 0.96?a1+a2?1.03, 0?a2?0.10, x+y+z=1, 0.05?x?0.40, 0.1?y?0.5 and 0.2?z?0.6.

Abstract: A piezoelectric ceramics having ceramic particles, wherein said ceramic particles comprises bismuth layer compound containing at least Sr, Ln (note that Ln is a lanthanoid element), Bi, Ti and O and including MIIBi4Ti4O15 type crystal (MII is an element composed of Sr and Ln) as a main component, and an oxide of Mn as a subcomponent; and an average particle diameter by the code length measuring method is 0.8 to 4.7 ?m: by which it is possible to provide piezoelectric ceramics having a large Qmax in a third harmonic mode of thickness vertical vibration in a relatively high frequency band (for example, 16 to 65 MHz), a resonator an other piezoelectric element comprising the piezoelectric ceramics as a piezoelectric substance thereof.

Abstract: Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content ?, in terms of Cu2O, falling within a range 0<??0.5% by mass and Ag being included in a content ?, in terms of Ag2O, falling within a range 0<??0.4% by mass, in relation to the main constituent; wherein: composition formula: Pba[(Zn1/3Nb2/3)xTiyZrz]O3, where 0.96?a?1.03, 0.005?x<0.05, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1.

Abstract: A piezoelectric ceramic and a piezoelectric device capable of being fired at a low temperature and improving piezoelectric properties are provided. The piezoelectric ceramic and the piezoelectric device includes Pba[(Znb/3Nb2/3)xTiyZrz]O3 (where 0.94?a?1.02, 1<b?3, x+y+z=1, 0.05?x<0.125, 0.275<y?0.5, 0.375<z?0.6) or (Pbe·fMef)[(Zng/3Nb2/3)uTivZrw]O3 (where 0.96?e?1.03, 0.01?f?0.1, 1<g?3, u+v+w=1, 0.05?u<0.125, 0.275<v?0.5, 0.375<w?0.6, and Me indicates Sr, Ba or Ca). When an excessive amount of Zn is included, the firing temperature can be lower, and the piezoelectric properties can be improved.

Abstract: For the purpose of preventing the degradation of the piezoelectric strain properties when Cu is used for internal electrodes, there is provided a piezoelectric ceramic composition including: a composite oxide, as a main constituent thereof, represented by (Pba-bMeb) [(Zn1/3Nb2/3)xTiyZrz]O3 with the proviso that 0.96?a?1.03, 0?b?0.1, 0.05?x?0.15, 0.25?y?0.5, 0.35?z?0.6, and x+y+z=1, and Me represents at least one selected from Sr, Ca and Ba; and at least one selected from Co, Mg, Ni, Cr and Ga as a first additive to the main constituent in a content of 0.5% by mass or less (not inclusive of 0) in terms of oxide, wherein an electrode made of Cu is to be disposed on the piezoelectric ceramic composition.

Abstract: A piezoelectric ceramic composition has as a chief ingredient a composite oxide that has Pb, Ti and Zr as constituent elements. It contains as a first accessory ingredient at least one element selected from the group consisting of Mn, Co, Cr, Fe and Ni in an amount of 0.2 mass % or less excluding 0 mass % in terms of an oxide. As the first accessory ingredient, at least one species selected from the ingredients represented by CuOx, wherein x?0, can be adopted. In this case, the content of the first accessory ingredient is 3.0 mass % or less excluding 0 mass %. The piezoelectric ceramic composition is fired under reducing and firing conditions. The reducing and firing conditions include a firing temperature in the range of 800° C. to 1200° C. and an oxygen partial pressure in the range of 1×10?10 to 1×10?6 atm., for example.

Abstract: The present invention has an object to provide piezoelectric ceramics containing no lead, having a high Curie point, and further, having excellent piezoelectric properties, particularly large Qmax. The piezoelectric ceramics contain, as a main component, a bismuth layer-structured compound having (MII1-xLnx)Bi4Ti4O15 crystals (MII is an element selected from Sr, Ba, and Ca, Ln is an element selected from lanthanoids, and x is within a range of 0<x?0.5) and further contain, as secondary components, at least one of Mn oxide and Co oxide, and lanthanoid, wherein the lanthanoid being the secondary component is contained within a range of 0.02 to 0.12 wt % in terms of oxide thereof.

Abstract: A piezoelectric ceramic composition which has a large electromechanical coupling factor and is excellent in heat resisting properties is provided. As additives, Cr, Al and Si are contained together in the piezoelectric ceramic composition including a perovskite compound which contains Pb, Zr and Ti as main components. Preferably, Cr, Al and Si are respectively contained in a content of 0.05 to 0.50 wt % in terms of Cr2O3, in a content of 0.005 to 1.500 wt % in terms of Al2O3, and in a content of 0.005 to 0.100 wt % in terms of SiO2. By simultaneously including these three elements and setting the contents thereof to fall within the above mentioned ranges, the electromechanical coupling factor kt can be 30% or more, and ?Fr, which is the rate of change in resonant frequency Fr between before and after application of an external thermal shock, can be 0.5% or less in absolute value.

Abstract: A method of manufacturing a multilayer ceramic device capable of obtaining a superior multilayer ceramic device even if the number of layers increases or even if the multilayer ceramic device is upsized, and specifically suitable for manufacturing a multilayer piezoelectric device is provided. After a laminate in which ceramic precursor layers including a raw material of a ceramic layer and internal electrode precursor layers including copper metal as a raw material of an internal electrode layer are alternately stacked is formed, the laminate is heated to degrease the laminate. At this time, an atmospheric gas including an inert gas, 7 mol % to 50 mol % of water vapor, and, if necessary, hydrogen is used to adjust an oxygen partial pressure within a range of p(O2)?(25331×Kp)2/3, where p(O2) represents an oxygen partial pressure; Kp represents a water dissociation equilibrium constant; and the pressure unit is Pa.

Abstract: A piezoelectric ceramic and a piezoelectric device capable of being fired at a low temperature and improving piezoelectric properties are provided. The piezoelectric ceramic and the piezoelectric device includes Pba[(Znb/3Nb2/3)xTiyZrz]O3 (where 0.94?a?1.02, 1<b?3, x+y+z=1, 0.05?x<0.125, 0.275<y?0.5, 0.375<z?0.6) or (Pbe·fMef)[(Zng/3Nb2/3)uTivZrw]O3 (where 0.96?e?1.03, 0.01?f?0.1, 1<g?3, u+v+w=1, 0.05?u<0.125, 0.275<v?0.5, 0.375<w?0.6, and Me indicates Sr, Ba or Ca). When an excessive amount of Zn is included, the firing temperature can be lower, and the piezoelectric properties can be improved.

Abstract: The invention provides a piezoelectric ceramic material comprising a Bi3TiNbO9 crystal and/or an MBi2Nb2O9 crystal which are each a bismuth layer compound, where M represents at least one element selected from Sr, Ba and Ca. The ceramic material contains Bi, Ti, M and Nb as main component elements. The molar ratio as oxides of the main component elements is given by (Bi3−xMx)z (Nb1+yTi1−y)O9 provided that 0<x, y≦0.8 and 0.95≦z≦1.05. When the molar ratio of Ba/(M+Bi) is given by xB/3 and the molar ratio of Ca/(M+Bi) is given by xC/3, it is required that 0≦xB≦0.5 and 0≦xC<0.4. This piezoelectric ceramic material, free from any lead whatsoever, has a sufficiently high Curie point, and exhibits ever more improved piezoelectric properties.

Abstract: Piezoelectric ceramics include a bismuth layer compound containing MII, Bi, Ti, Ln and O, wherein MII represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include MIIBi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5. In the case where MII is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.

Abstract: A piezoelectric ceramic is a bismuth-layer compound having SrBi4Ti4O15-type crystal. The axial ratio c/a of crystal lattice is in the range of 7.46 to 7.67.

Abstract: A piezoelectric ceramic having a carbon content after sintering of less than 37 ppm by weight and a piezoelectric device such as a ceramic resonator, ceramic filter, piezoelectric element, piezoelectric buzzer, piezoelectric transformer, and ultrasonic vibrator using the same.

Abstract: The invention provides a piezoelectric ceramic material comprising a Bi3TiNbO9 crystal and/or an MBi2Nb2O9 crystal which are each a bismuth layer compound, where M represents at least one element selected from Sr, Ba and Ca. The ceramic material contains Bi, Ti, M and Nb as main component elements. The molar ratio as oxides of the main component elements is given by (Bi3−xMx)z (Nb1+yTi1−y)O9 provided that 0<x, y≦0.8 and 0.95≦z≦1.05. When the molar ratio of Ba/(M+Bi) is given by xB/3 and the molar ratio of Ca/(M+Bi) is given by xc/3, it is required that 0≦xB≦0.5 and 0≦xC<0.4. This piezoelectric ceramic material, free from any lead whatsoever, has a sufficiently high Curie point, and exhibits ever more improved piezoelectric properties.

Abstract: Piezoelectric ceramics include a bismuth layer compound containing MII, Bi, Ti, Ln and O, wherein MII represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include MIIBi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5. In the case where MII is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.

Abstract: Piezoelectric ceramics which is made of compounds shaped in bismuth layer containing Sr, Bi, Ti and Ln (lanthanoid). The compound contains SrBi4Ti4O15 typed crystals. In the piezoelectric ceramics, an atomic ratio of Ln/(Sr+Ln) is 0<Ln/(Sr+Ln)<0.5.

Abstract: A dust core ferromagnetic powder comprises a ferromagnetic metal powder, an insulating material, and a lubricant. The insulating material comprises a phenol resin and/or a silicone resin, and the lubricant comprises at least one compound selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, and barium stearate. It is possible to achieve a dust core having high saturation magnetic flux density, low losses, and satisfactory permeability with its dependence on frequency being improved.