scholarly journals Preparation of barium titanate porous ceramics and their sensor properties

2013 ◽  
Vol 121 (1416) ◽  
pp. 698-701 ◽  
Author(s):  
Kazuki MAEDA ◽  
Ichiro FUJII ◽  
Kouichi NAKASHIMA ◽  
Gakuyo FUJIMOTO ◽  
Kazuhiro SUMA ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Porous Ceramics ◽  
Sensor Properties

Microstructure Control of Potassium Niobate Porous Ceramics and their Sensor Properties

2013 ◽  
Vol 566 ◽  
pp. 241-244 ◽  
Author(s):  
Kazuki Maeda ◽  
Kenta Yamashita ◽  
Ichiro Fujii ◽  
Kouichi Nakashima ◽  
Tohru Suzuki ◽  
...  
Keyword(s):  
Carbon Black ◽  
Pore Size ◽  
Piezoelectric Properties ◽  
Raw Materials ◽  
Porous Ceramics ◽  
Argon Atmosphere ◽  
Potassium Niobate ◽  
Plasma Sintering ◽  
Sensor Properties ◽  
Spark Plasma

Porous potassium niobate (KNbO3, KN) system ceramics were prepared by spark plasma sintering (SPS) method using carbon black (CB, 5 μm). First, the powders of raw materials were mixed in ethanol by ball milling, and then calcined. Obtained KN powders with CB were sintered by SPS in argon atmosphere. Their piezoelectric properties were measured and a relationship between porosity, pore size, and sensor properties was studied. It was found that d33 increased as pore size decreased. Thus, pore size was important for the improvement of value of g33/ρ.

Preparation of Barium Titanate Porous Ceramics and their Piezoelectric Power Generation Property

2013 ◽  
Vol 566 ◽  
pp. 41-44
Author(s):  
Satoshi Wada ◽  
Yoshikazu Shimura ◽  
Petr Pulpan ◽  
Ichiro Fujii ◽  
Kouichi Nakashima
Keyword(s):  
Power Generation ◽  
Dielectric Constant ◽  
Barium Titanate ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Porous Ceramics ◽  
Elastic Compliance ◽  
Conventional Sintering ◽  
Sintering Method ◽  
Dielectric And Piezoelectric Properties

Barium titanate (BaTiO3) porous ceramics were prepared by conventional sintering method, and their dielectric and piezoelectric properties were measured using 31-resonators. With decreasing sintering temperature, dielectric constant showed a maximum of 5500 at 1300 °C, while piezoelectric constant and elastic compliance increased. These resonators were developed to unimorph-type vibrators and their instantaneous electric powers were measured. As the results, the maximum electric power of 129 μW was measured for the BaTiO3porous ceramics sintered at 1200 °C, and this value was 20 times greater than that for dense BaTiO3ceramics.

scholarly journals Preparation and Sintering Effect in Quartz-Barium Titanate Porous Ceramics and Permeability Modulation Using an Implanted Electrode

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Ernesto Suaste Gómez ◽  
José de Jesús Agustín Flores Cuautle ◽  
Omar Terán Jiménez
Keyword(s):  
Barium Titanate ◽  
Permeability Coefficient ◽  
Piezoelectric Ceramics ◽  
Porous Ceramics ◽  
Darcy Law ◽  
Internal Electrode ◽  
Nichrome Wire ◽  
Liquid Permeability ◽  
Porous Area ◽  
Alternating Voltage

Barium titanate and quartz mixed in different proportions were used to create porous piezoelectric ceramics. Three different sintering temperatures were used for the ceramics preparation; a nichrome wire was used as internal electrode in porous ceramics. Characteristics as porous area, porosity, and its relationship with quartz percentage and sintering temperatures were studied. Porous ceramics with an implanted electrode were created, by applying an alternating voltage in the internal electrode that controlled the liquid permeability coefficient, calculated by the Darcy Law.

Microstructure Control of Porous Barium Titanate Ceramics and their Sensor Properties

2013 ◽  
Vol 582 ◽  
pp. 32-35
Author(s):  
Kazuki Maeda ◽  
Ichiro Fujii ◽  
Kouichi Nakashima ◽  
Gakuyo Fujimoto ◽  
Kazuhiro Suma ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Pore Structure ◽  
Pore Size ◽  
Figure Of Merit ◽  
Microstructure Control ◽  
Conventional Sintering ◽  
Sensor Properties ◽  
Titanate Ceramics ◽  
The Relationship ◽  
Sintering Method

Porous barium titanate (BaTiO3, BT) ceramics were prepared by a conventional sintering method using two kinds of BT particles. The relationship between pore structure (porosity and pore size) of BT ceramics and their sensor properties was investigated. Since a piezoelectric d33 constant of BT depends largely on the pore structures, the microstructure control of porous BT ceramics is important to improve the figure-of-merit (g33/ρ). In this study, the maximal piezoelectric g33 constant value of 14.8×10-3 V·m·N-1 and the maximal g33/ρ value of 3.14×103 V·m4·N-1·g-1 were recorded at a porosity of approximately 23%.

Microscopy of porous ceramics

1989 ◽  
Vol 47 ◽  
pp. 438-439
Author(s):  
H. M. Kerch ◽  
R. A. Gerhardt
Keyword(s):  
Porous Ceramics ◽  
Specimen Preparation ◽  
High Porosity ◽  
Ion Milling ◽  
Forming Process ◽  
Preparation Methods ◽  
Pore Texture ◽  
Proper Design ◽  
And Function ◽  
Function Information

Highly porous ceramics are employed in a variety of engineering applications due to their unique mechanical, optical, and electrical characteristics. In order to achieve proper design and function, information about the pore structure must be obtained. Parameters of importance include pore size, pore volume, and size distribution, as well as pore texture and geometry. A quantitative determination of these features for high porosity materials by a microscopic technique is usually not done because artifacts introduced by either the sample preparation method or the image forming process of the microscope make interpretation difficult.Scanning electron microscopy for both fractured and polished surfaces has been utilized extensively for examining pore structures. However, there is uncertainty in distinguishing between topography and pores for the fractured specimen and sample pullout obscures the true morphology for samples that are polished. In addition, very small pores (nm range) cannot be resolved in the S.E.M. On the other hand, T.E.M. has better resolution but the specimen preparation methods involved such as powder dispersion, ion milling, and chemical etching may incur problems ranging from preferential widening of pores to partial or complete destruction of the pore network.

DC AND AC ELECTRICAL PROPERTIES OF PTC BARIUM TITANATE CERAMICS

1990 ◽  
Vol 51 (C1) ◽  
pp. C1-979-C1-984
Author(s):  
S. HISHITA ◽  
J. F. BAUMARD ◽  
P. ABELARD
Keyword(s):  
Electrical Properties ◽  
Barium Titanate ◽  
Ac Electrical Properties ◽  
Titanate Ceramics
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