Dielectric property-microstructure relation in MgTiO3-CaTiO3 ceramics

Download

index.pdf

Date

2019

Author

Ergin Örek, Merve

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

215
views

223
downloads

A magnesium titanate - calcium titanate (MgTiO3-CaTiO3) dielectric ceramic with the mole percent composition of 95MgTiO3-5CaTiO3 (M0.95CT), was prepared from high purity powders of MgO, CaCO3, and TiO2 by conventional mixed-oxide route at various sintering temperatures ranging from 1200 to 1300 °C for 2, 4, and 6 h. The maximum densification and optimum dielectric properties were obtained for the M0.95CT ceramic sintered at 1250 °C for 4 h. The bulk density was 3.82 g/cm3 which corresponds to 97.5% of theoretical density. The dielectric constant and dielectric loss values were 20.6 and 0.0003 (1 kHz-40 MHz), respectively. The effects of small amounts (0.25, 0.50, 0.75, and 1.00 wt%) of Zn3B2O6, selected as liquid phase sintering aid, additions on the microstructural development, densification, and dielectric properties of M0.95CT ceramics were also investigated. The results revealed that incorporation of Zn3B2O6 caused abnormal grain growth. Densification and dielectric constant of 0.75 wt% Zn3B2O6 added M0.95CT ceramic decreased to 92% of theoretical density and 13.8, respectively but, dielectric loss increased to 0.0006. The low-temperature sintered microstructures of pure and Zn3B2O6 added M0.95CT ceramics were correlated with the dielectric properties.

Subject Keywords

Ceramics., MgTiO3, CaTiO3, Magnesium Calcium Titanate, Dielectric, Ceramics.

URI

http://etd.lib.metu.edu.tr/upload/12624416/index.pdf
https://hdl.handle.net/11511/44223

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

TL and OSL properties of Mn2+-doped MgGa2O4 phosphor LUCHECHKO, ANDRİY; ZHYDACHEVSKYY, YAROSLAV; MARABA, DİREN; Bulur, Enver; UBİZSKİİ, SERGİY; KRAVETS, OLGA (2018-04-01) The oxide MgGa2O4 spinel ceramics doped with Mn2+ ions was synthesized by a solid-state reaction at 1200 degrees C in air. The activator concentration was equal 0.05 mol% of MnO. Phase purity of the synthesized samples was analyzed by X-ray diffraction technique. This spinet ceramics show efficient green emission in the range from 470 to 550 nm with a maximum at about 505 nm under UV or X-ray excitations, which is due to Mn2+ ions. MgGa2O4: Mn2+ exhibits intense thermoluminescence (TL) and optically stimula...
Dielectric and electrical properties of an organic device containing benzotriazole and fluorene bearing copolymer Yildiz, Dilber Esra; APAYDIN, Dogukan Hazar; Toppare, Levent Kamil; Çırpan, Ali (2013-05-05) Dielectric and electrical properties of a benzotriazole and fluorene copolymer were investigated using current-voltage (IV), capacitance-voltage (CV), and conductancevoltage (G/wV) measurements at room temperature. The electrical parameters, barrier height (phi Bo), and ideality factor (n) obtained from the forward bias LnI-V plot were found as 0.453 eV and 2.08, respectively. The Rsvalues were found as 2.20, 2.12, 1.90 using dV/dLnIversus I, H(I)versus I and F(V)-V plots,respectively. The dielectric consta...
Molar volume calculated at various pressures and the Pippard relations close to the melting point in benzene Yurtseven, Hasan Hamit (2016-03-03) The molar volume of solid and liquid benzene was calculated at various pressures (at constant temperatures), and the Pippard relations were examined close to the melting point in this organic molecule.The molar volume calculated is in good agreement with the observed data, which decreases as the pressure increases up to about 150 MPa. The Pippard relations are also valid within this pressure range at constant temperatures studied here for the solid and liquid phases of benzene.
Kinetic investigation of chemical vapor deposition of B4C on tungsten substrate Karaman, Mustafa; Sezgi, Naime Aslı; Doğu, Timur; Ozbelge, H. Onder (2006-12-01) Production of beta-rhombohedral boron carbide (B4C) on a tungsten substrate by the chemical vapor deposition from a BCl3-H-2-CH4 gas mixture was achieved. An impinging-jet reactor was used to minimize the mass-transfer limitations on the reaction kinetics, which made a detailed kinetic investigation possible. Results of the XRD and XPS analyses showed that the solid product formed on the substrate is a rhombohedral B4C phase. Both dichloroborane and boron carbide formation rates were found to increase with ...
Electrochromic properties and electrochromic device application of copolymer of N-(4-(3-thienyl methylene)-oxycarbonylphenyl)maleimide with thiophene Ak, Metin; Camurlu, Pinar; Yilmaz, Faruk; Cianga, Luminita; Yagci, Yusuf; Toppare, Levent Kamil (2006-12-05) A new copolymer of N-(4-(3-thienyl methylene)-oxycarbonylphenyl)maleimide (MBThi) with thiophene [P(MBThi-co-Th)] was synthesized electrochemically in the presence of tetrabutylammonium tetrafluoroborate as the supporting electrolyte, in acetonitrile/borontrifluoride ethylether solvent mixture (80 : 20, v/v). Spectroelectrochemical analysis of the resulting copolymer reflected electronic transitions at 440, 730, and similar to 1000 nm, revealing pi-pi* transition, polaron, and bipolaron band formation, resp...

Citation Formats

M. Ergin Örek, “Dielectric property-microstructure relation in MgTiO3-CaTiO3 ceramics,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Metallurgical and Materials Engineering., Middle East Technical University, 2019.