Ho2O3 Additive Effects on Microstructure and Dielectrical Properties of BaTiO3 Ceramics
Apstrakt
Doped BaTiO3-ceramics is very interesting for its application as resistors with PTCR, multilayer ceramics capacitors, thermal sensors etc. Ho doped BaTiO3 ceramics, with different Ho2O3 content, ranging from 0.01 to 1.0 wt% Ho, were investigated regarding their microstructural and dielectric characteristics. The samples were prepared by the conventional solid state reaction and sintered at 1320°, 1350 °C and 1380°C in an air atmosphere for 4 hours. The grain size and microstructure characteristics for various samples and their phase composition were carried out using a scanning electron microscope SEM equipped with EDS system. SEM analysis of Ho/BaTiO3 doped ceramics showed that in samples doped with a low level of rare-earth ions, the grain size ranged from 10-40mm, while with the higher dopant concentration the abnormal grain growth is inhibited and the grain size ranged between 2-10μm. Dielectric measurements were carried out as a function of temperature up to180°C. The low doped sa...mples sintered at 1380°C, display the high value of dielectric permittivity at room temperature, 2500 for 0.01Ho/BaTiO3. A nearly flat permittivity-response was obtained in specimens with higher additive content. Using a modified Curie-Weiss low the Curie constant (C/) and a critical exponent γ were calculated. The obtained values of γ pointed out the diffuse phase transformation in heavily doped BaTiO3 samples.
Ključne reči:
BaTiO3 ceramics / Ho2O3 / microstructure / dielectric propertiesIzvor:
The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts, 2012, 10-10Izdavač:
- Belgrade : Serbian Ceramic Society
Finansiranje / projekti:
- Usmerena sinteza, struktura i svojstva multifunkcionalnih materijala (RS-MESTD-Basic Research (BR or ON)-172057)
Institucija/grupa
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - CONF AU - Paunović, Vesna AU - Mitić, Vojislav V. AU - Živković, Ljiljana AU - Miljković, Miroslav PY - 2012 UR - https://dais.sanu.ac.rs/123456789/526 AB - Doped BaTiO3-ceramics is very interesting for its application as resistors with PTCR, multilayer ceramics capacitors, thermal sensors etc. Ho doped BaTiO3 ceramics, with different Ho2O3 content, ranging from 0.01 to 1.0 wt% Ho, were investigated regarding their microstructural and dielectric characteristics. The samples were prepared by the conventional solid state reaction and sintered at 1320°, 1350 °C and 1380°C in an air atmosphere for 4 hours. The grain size and microstructure characteristics for various samples and their phase composition were carried out using a scanning electron microscope SEM equipped with EDS system. SEM analysis of Ho/BaTiO3 doped ceramics showed that in samples doped with a low level of rare-earth ions, the grain size ranged from 10-40mm, while with the higher dopant concentration the abnormal grain growth is inhibited and the grain size ranged between 2-10μm. Dielectric measurements were carried out as a function of temperature up to180°C. The low doped samples sintered at 1380°C, display the high value of dielectric permittivity at room temperature, 2500 for 0.01Ho/BaTiO3. A nearly flat permittivity-response was obtained in specimens with higher additive content. Using a modified Curie-Weiss low the Curie constant (C/) and a critical exponent γ were calculated. The obtained values of γ pointed out the diffuse phase transformation in heavily doped BaTiO3 samples. PB - Belgrade : Serbian Ceramic Society C3 - The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts T1 - Ho2O3 Additive Effects on Microstructure and Dielectrical Properties of BaTiO3 Ceramics SP - 10 EP - 10 UR - https://hdl.handle.net/21.15107/rcub_dais_526 ER -
@conference{ author = "Paunović, Vesna and Mitić, Vojislav V. and Živković, Ljiljana and Miljković, Miroslav", year = "2012", abstract = "Doped BaTiO3-ceramics is very interesting for its application as resistors with PTCR, multilayer ceramics capacitors, thermal sensors etc. Ho doped BaTiO3 ceramics, with different Ho2O3 content, ranging from 0.01 to 1.0 wt% Ho, were investigated regarding their microstructural and dielectric characteristics. The samples were prepared by the conventional solid state reaction and sintered at 1320°, 1350 °C and 1380°C in an air atmosphere for 4 hours. The grain size and microstructure characteristics for various samples and their phase composition were carried out using a scanning electron microscope SEM equipped with EDS system. SEM analysis of Ho/BaTiO3 doped ceramics showed that in samples doped with a low level of rare-earth ions, the grain size ranged from 10-40mm, while with the higher dopant concentration the abnormal grain growth is inhibited and the grain size ranged between 2-10μm. Dielectric measurements were carried out as a function of temperature up to180°C. The low doped samples sintered at 1380°C, display the high value of dielectric permittivity at room temperature, 2500 for 0.01Ho/BaTiO3. A nearly flat permittivity-response was obtained in specimens with higher additive content. Using a modified Curie-Weiss low the Curie constant (C/) and a critical exponent γ were calculated. The obtained values of γ pointed out the diffuse phase transformation in heavily doped BaTiO3 samples.", publisher = "Belgrade : Serbian Ceramic Society", journal = "The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts", title = "Ho2O3 Additive Effects on Microstructure and Dielectrical Properties of BaTiO3 Ceramics", pages = "10-10", url = "https://hdl.handle.net/21.15107/rcub_dais_526" }
Paunović, V., Mitić, V. V., Živković, L.,& Miljković, M.. (2012). Ho2O3 Additive Effects on Microstructure and Dielectrical Properties of BaTiO3 Ceramics. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts Belgrade : Serbian Ceramic Society., 10-10. https://hdl.handle.net/21.15107/rcub_dais_526
Paunović V, Mitić VV, Živković L, Miljković M. Ho2O3 Additive Effects on Microstructure and Dielectrical Properties of BaTiO3 Ceramics. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts. 2012;:10-10. https://hdl.handle.net/21.15107/rcub_dais_526 .
Paunović, Vesna, Mitić, Vojislav V., Živković, Ljiljana, Miljković, Miroslav, "Ho2O3 Additive Effects on Microstructure and Dielectrical Properties of BaTiO3 Ceramics" in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts (2012):10-10, https://hdl.handle.net/21.15107/rcub_dais_526 .