Dense ceramics of BaTiO3 produced from powders prepared by a chemical process

Miot, C.; Proust, C.; Husson, E.

doi:10.1016/0955-2219(95)00090-9

Cited by 32 publications

(18 citation statements)

References 15 publications

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“…BaTiO 3 (BT)-based materials are among the most used oxide systems in microelectronics, in particular for tunable elements, pyroelectric, piezoelectric, electro-optic and charge storage applications [1][2][3][4][5][6][7]. BT and its solid solutions are lead-free ferroelectrics with a wide range of permittivity varying from a few hundreds to thousands, depending mainly on the doping level, microstructural characteristics, density and grain size, temperature range and applied field [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study of the role of porosity on the functional properties of (Ba,Sr)TiO 3 ceramics

Stanculescu

Ciomaga

Padurariu

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Study of the role of porosity on the functional properties of (Ba,Sr)TiO 3 ceramics

Stanculescu

Ciomaga

Padurariu

et al. 2015

Journal of Alloys and Compounds

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“…The values of relative density evaluated as the ratio of apparent density to the theoretical density are very similar (Table 1). Duran et al (2002) and Miot et al (1995) found that density of BaTiO3 sintered pellets based on the value of lattice constant is equal to 6.02 g/cm 3 . So, the obtained relative density is in agreement with the results of other authors.…”

Section: Resultsmentioning

confidence: 99%

“…BaTiO3 is destined for many applications in different industries, such as energy storage devices and multilayer actuators (MLAs) (Miot et al, 1995;Kao and Yang, 1999). These applications require materials with a good density, a high dielectric constant and a low loss factor.…”

Section: Introductionmentioning

confidence: 99%

“…At Curie temperature the barium titanate transforms from paraelectric to ferroelectric phase (Ertuğ, 2013). Synthesis of materials with these properties needs highly pure, fine grained ceramics, which may be obtained from homogeneous reproducible powders of spherical particles (Miot et al, 1995;Kholodkova et al, 2012). Choi et al (2008) underline that MLCs have been investigated because their advantages are high precision, little noise and low power consumption, compared with conventional multilayer actuators (MLAs).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Barium Titanate Piezoelectric Ceramics for Multilayer Actuators (MLAs)

Biglar

Gromada

Stachowicz

et al. 2017

Acta Mechanica Et Automatica

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Abstract:In this paper the characteristics of BaTiO3 ceramics synthesized by solid state method is presented. In order to receive the monophase ceramics the double activation and calcination were applied. A spray drier was used to granulate the powder of BaTiO3. Isostatic and uniaxial pressing were applied to manufacture the barium titanate pellets. The properties of fabricated BaTiO3 ceramics were determined at different stages of production. After the sintering phase, the hardness, the bending strength, the fracture toughness, and the coefficient of thermal expansion of barium titanate sinter were estimated. The BaTiO3 powder is characterized by spherical grains and the average size of 0.5 μm. The small value of the specific surface area of granulate ensured good properties of material mouldability and finally allowed to receive sinters of high density.

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“…The use of this BaTiO 3 powder significantly improves the quality of ceramics [14]. However, the atomic ratio of Ba : Ti in the synthesized BaTiO 3 is equal to 0.98 -1.02 and the residual weight content of carbon in the surface layer of ceramics is 0.04% [15]. Consequently, this method does not guarantee the synthesis of strictly stoichiometric products in the form of nanosize powders with a narrow granulometric composition.…”

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confidence: 99%

Synthesis of Complex Oxides of Rare Elements of Groups IV and V (A Review)

et al. 2005

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The prospects of using various methods of synthesis for producing extra-pure complex oxides of alkali and bivalent elements with rare elements of groups IV and V of precisely prescribed chemical and granulometric compositions are analyzed. It is demonstrated that only the sol-gel method with inorganic precursors yields nanosize powders of narrow granulometric classes. Epitaxial coatings based on complex oxides can be synthesized by the sol-gel method using organic precursors or true solutions of reactant components.Tantalates and niobates of alkali elements, titanates and zirconates of magnesium, strontium, barium, and lead, as well as solid solutions based on them possess ferroelectric and nonlinear-optical properties and can be used in the form of monocrystals, ceramics, micro-and nanosize powders, or thin films. The purpose of our study is the comparative evaluation of methods for synthesizing such compounds.The most common is the sintering method when initial components are mixed, the mixture is charged into cuvettes and subjected to heat treatment. Depending on the composition of the product synthesized and the choice of initial components, heat treatment is performed at a temperature of 900 -1300°C. The process depends on the diffusion of the low-melting component into the grains of the component with the higher-melting temperature. At early stages, compounds with the maximum absolute variation in Gibbs' energy are formed [1]. They have a higher melting or decomposition temperature than other compounds present in the system. If an intermediate phase emerges in synthesis, whose melting temperature is higher than the melting temperature of the initial components, it acts as a barrier determining the process kinetics.As a rule, a series of intermediate compounds are formed. For instance, in the synthesis of Pb(NbO 3 ) 2 by sintering Nb 2 O 5 and PbO [2], initially a multiphase layer is formed on the surface of Nb 2 O 5 particles, which contains 3PbO × Nb 2 O 5 , the solid solution 5PbO × 2Nb 2 O 5 -2PbO × Nb 2 O 5 , and 3PbO × 2Nb 2 O 5 ; in doing so, PbO is fully consumed. The phases PbO × Nb 2 O 5 and PbO × 2Nb 2 O 5 have not been registered in the reaction product layer, which contradicts the common assumption that all phase existent in a system should be formed sequentially. At the second stage, 3PbO × Nb 2 O 5 is consumed and the layer of the solid solution 5PbO × 2Nb 2 O 5 -2PbO × Nb 2 O 5 increases significantly. At the third stage, PbO is removed from the solid solution, reaching the ultimate composition of 2PbO × Nb 2 O 5 . Next, a lead metaniobate layer emerges and slowly grows, whereas the thickness of the layer 3PbO × 2Nb 2 O 5 increases sharply due to the transformation of 2PbO × Nb 2 O 5 into the specified phase. When 2PbO × Nb 2 O 5 nearly disappears, the lead metaniobate layer is just a few nanometers thick and the reaction product is mainly represented by the phase 3PbO × 2Nb 2 O 5 . Finally, the layer Pb(NbO 3 ) 2 formed in the reaction of 3PbO × 2Nb 2 O 5 with Nb 2 O 5 becomes expanded.The e...

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Dense ceramics of BaTiO3 produced from powders prepared by a chemical process

Cited by 32 publications

References 15 publications

Study of the role of porosity on the functional properties of (Ba,Sr)TiO 3 ceramics

Study of the role of porosity on the functional properties of (Ba,Sr)TiO 3 ceramics

Synthesis of Barium Titanate Piezoelectric Ceramics for Multilayer Actuators (MLAs)

Synthesis of Complex Oxides of Rare Elements of Groups IV and V (A Review)

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