Characterization Of Hexabarium 17 Titanate And Its Effects On The Dielectric Properties Of Barium Titanate Ceramics PDF Download

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Characterization of Hexabarium 17-titanate and Its Effects on the Dielectric Properties of Barium Titanate Ceramics

Characterization of Hexabarium 17-titanate and Its Effects on the Dielectric Properties of Barium Titanate Ceramics
Author: Xilin Xu
Publisher:
Total Pages: 348
Release: 2004
Genre: Barium compounds
ISBN:
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"The initial goal of this Ph. D. program was related to the fabrication of high energy density multilayer ceramic capacitors (MLCCs) using coextrusion related techniques. A significant amount of work was initially performed on the rheological characterization of the coextrusion process, binder burnout for base metal electrode (BME) MLCCs, and co-firing. However, due to various reasons, this project could not be continued. A second phase having a dendritic morphology was constantly observed in MLCCs samples fabricated by both coextrusion and tape casting methods based on a commercial X7R powder. At this point the focus of my research was changed to the characterization of this second phase and its effect on the dielectric properties of the BaTiO3 ceramics."--General Introduction, p. 1.

Dielectric Properties and Method of Characterizing Ceramic Powders and Multiphase Composites

Dielectric Properties and Method of Characterizing Ceramic Powders and Multiphase Composites
Author: Ravi K. Kota
Publisher:
Total Pages: 67
Release: 2006
Genre: Ceramic materials
ISBN:
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Abstract: Barium Titanate was the first developed ferroelectric ceramic material and even today it is widely used. It is also a well-known material used for capacitors. The only reason behind a wide range of applications is that barium titanate boasts of high dielectric properties. A phase transition from cubic to tetragonal at normal working temperatures provides enhanced dielectric properties in this electronic material. For any application and design, the most inquired property is the dielectric constant. Predicting the dielectric constant is very much required as it is the pre-requisite. This is the major objective of the present work. To estimate the quality of a synthesized powder relative to an already existing commercial powder, a method has been introduced to characterize the powder for dielectric constant which is completely reliable and reproducible. This system not only works in the determination of dielectric constant of ceramic particles but also for multiphase composites. The characterization method developed is further used to check the effect of lattice OH group on the dielectric properties of barium titanate.

Dielectric Titanate Ceramics

Dielectric Titanate Ceramics
Author:
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Total Pages:
Release: 2003
Genre:
ISBN:
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This thesis deals with the investigations on the dielectric properties of polycrystalline ceramics having uncommon substitutions in barium titanate and other related phases of BaTiO3-CaTiO3, MgTiO3-CaTiO3 and MgTiO3-BaTiO3 systems. After presenting a brief introduction on the ceramic materials studied in terms of their crystal structures, electrical properties, nonstoichiometry and microstructural characteristics. The thesis describes the synthesis of the ceramics and the methodology of different techniques utilized in characterizing the samples. Barium calcium titanate was synthesized through novel wet chemical techniques and the dielectric properties of calcium substituted barium titanate do not reveal multi-site occupancy whereas they are predominantly influenced by the A/B cationic ratio. The role of transition metals of the 3d series from vanadium (Z=23) to zinc (Z=30) in modifying the crystallographic phase content, microstructure and the dielectric properties of BaTiO3 ceramics containing 10 at% impurities were studied. All the transition metals brought about the phase conversion to hexagonal BaTiO3, although no systematics could be arrived at relating the hexagonal content to the 3d electronic configuration of the impurities. The relaxor dielectrics arising from the titanate solid solution with uncommon substitution and its interconversion to normal ferroelectrics is studied. The effects of cationic substitutions of iron and niobium for titanium in BaTiO3 pervoskite lattice in crystal symmetry and dielectric properties were investigated. The above dielectric characteristics are comparable in a converse way to those of the well known Pb(Mg1/3Nb2/3)O3-PbTiO3 system wherein the relaxor behaviour occurs within the lower lead titanate compositional limits. The modification in r-T characteristics of positive temperature coefficient in resistance (PTCR) by the addition of segregative additives such as B2O3, Al2O3 etc in BaTiO3 and its conversion to grain boundary l.

Titanate Based Ceramic Dielectric Materials

Titanate Based Ceramic Dielectric Materials
Author: R. Saravanan
Publisher: Materials Research Forum LLC
Total Pages: 167
Release: 2018-02-25
Genre: Technology & Engineering
ISBN: 1945291559
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Barium titanate is one of the most important electronic materials; due to its high permittivity, low dielectric loss and high tunability. The environment friendly material is suitable for microphones and microwave device applications such as tunable capacitors, delay lines, filters, resonators and phase shifters. Doped titanates are extensively used for various electronic devices, such as transducers, piezoelectric actuators, passive memory storage devices, dynamic random access memory (DRAM), multilayer ceramic capacitors (MLCCs), positive temperature coefficient resistors (PTCR), optoelectronic devices and infrared sensors. The book presents research results concerning the electron density distribution in a number of doped barium titanate ceramic materials using experimental X-ray diffraction data, UV-visible spectrophotometry (UV-vis), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The analysis of interatomic bonding and electron density distribution is important for predicting the properties of potentially important materials and has previously been lacking for the materials studied. Barium Titanate, Barium Titanate Doping, Dielectric Ceramics, Permittivity, Tunability, Transducers, Piezoelectric Actuators, Memory Storage Devices, Multilayer Ceramic Capacitors, Optoelectronic Devices, X-Ray Diffraction Data, UV-Visible Spectrophotometry, Energy Dispersive X-Ray Spectroscopy, Interatomic Bonding, Electron Density Distribution, Ceramic Property Predictions.

Metrology and Analysis of Nano-particulate Barium Titanate Dielectric Material

Metrology and Analysis of Nano-particulate Barium Titanate Dielectric Material
Author:
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Total Pages:
Release: 2007
Genre:
ISBN:
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Since its discovery in the 1940's, barium titanate has become one of the more popular dielectric materials for use in discrete capacitors due to its high relative permittivity. Recently, consumer electronics have decreased in size, driving the need for smaller electronic components. To fill this need, researchers have created polycrystalline barium titanate with individual grains in the nanometer scale. With this decrease in size, many problems arise. This paper will outline the effects on the dielectric properties due to shrinking the individual grains, as well as discuss techniques for dielectric measurement of this material.

Chemical Characterisation Of The Surfaces And Interfaces Of Barium Titanate And Related Electronic Ceramics

Chemical Characterisation Of The Surfaces And Interfaces Of Barium Titanate And Related Electronic Ceramics
Author:
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Total Pages:
Release: 2001
Genre:
ISBN:
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This thesis deals with the investigations on the atomic composition, chemical surface states and microstructural features of barium titanate and other electronic ceramics namely barium polytitantes, calcium manganites and magnesium calcium titanate by surface analytical techniques. After presenting a brief introduction on the ceramic materials studied in terms of their crystal structures, electrical properties, nonstoichiometry and interfacial characteristics, the thesis describes the synthesis of the ceramics and the methodology of the different surface analytical techniques utilized such as backscattering spectrometry (BS), an ion beam analysis (IBA) technique, X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS). The XPS investigations on the chemical surface states of polycrystalline barium titanate having well-defined electrical characteristics reveal the prevalence of Ba in two distinct chemical environments : the one corresponding to the lower binding energy is related to the dielectric while the other having higher binding energy is correlated to semiconducting properties of the ceramics. Processes such as abrasion or polishing make the surfaces more reactive and susceptible to atmospheric contamination. Sputter cleaning causes surface modification leading to changes in the Ba (3d) and Ti (2p) spectra. Studies on the surface atomic composition by BS and microstructural features of doped barium titanate ceramics reveal their interfacial characteristics in terms segregation of dopants or metal ion constituents. Surfaces of these ceramics exhibit cationic as well as anionic nonstoichiometry depending on the processing steps involved. Ceramics synthesized by oxalate precursor route are Ti-rich while those prepared by gel-to-crystallite method are Ba-rich. These are correlated to the chemical processes and background impurities which in turn control the microstructures. Barium titanate substitued with> 1 at. % Mn are deficient in.

Fabrication and Characterization of Barium Titanate Ceramics Possessing Low Concentrations of Copper (II) - Tantalum (V) Substituents:

Fabrication and Characterization of Barium Titanate Ceramics Possessing Low Concentrations of Copper (II) - Tantalum (V) Substituents:
Author: Noah T. Smith
Publisher:
Total Pages: 66
Release: 2021
Genre: Electronic ceramics
ISBN:
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Barium titanate, because of its large relative permittivity, is the primary material used in electroceramic capacitors. The desired properties of barium titanate can be preferentially augmented by deliberate, controlled substitutions and additions of dopants. In this work, copper (II) and tantalum (V) substitutions have been place into the barium titanate lattice at concentrations of 0.000000, 0.000250, 0.001375, 0.002500, 0.013750, 0.025000, represented as Ba(Cu1/3, Ta2/3)xTi1-xO3, where x is the dipole concentration. The samples were prepared using the two-step process, where BaCu1/3Ta2/3O3 was fabricated first, then added to the barium titanate and sintered. Permittivity-temperature peak broadening increases for all concentrations, and peak permittivity increases by at least a factor of 4 for the two lowest concentrations, showing no drop in permittivity. The permittivity of the samples at the three highest concentrations increases by up to a factor of 2 at low temperatures, showing a drop in peak permittivity by less than a factor of 2 between 390 K and 410 K and little difference at higher temperatures. permittivity decreases by much less than an order of magnitude when frequency is increased from 100 Hz to 1 MHz, indicating possible space-charge polarization effects. The optical bandgap of the substitute barium titanate is observed to be up to 12% larger than that of the pure barium titanate. The resistivity bandgap is on average 34% lower than the optical bandgap, At all temperatures, the three largest dipole concentrations result in resistivities at least an order of magnitude larger than pure barium titanate.