Synthesis, characterization and sintering of Gd2Hf2O7 powders synthesized by solid state displacement reaction at low temperature
Само за регистроване кориснике
2018
Аутори
Matović, BrankoMaletaškić, Jelena
Bučevac, Dušan
Zagorac, Jelena B.
Fajar, Muhammad
Yoshida, Katsumi
Yano, Toyohiko
Чланак у часопису (Објављена верзија)
,
© 2018 Elsevier Ltd and Techna Group S.r.l.
Метаподаци
Приказ свих података о документуАпстракт
Pyrochlore compound (Gd2Hf2O7) powder was prepared by reacting gadolinium nitrate and hafnium chloride with NaOH during solid state displacement reaction at low temperature (SSDR). The SSDR process at room temperature initially yielded amorphous powders, which crystallized after subsequent calcination to form crystalline ceramics. The formation of crystalline Gd2Hf2O7took place at temperature as low as 600 °C. The phase evolution with thermal treatment as well as powder properties such as crystallite size, lattice strain and lattice parameter were studied by X-ray powder diffraction (XRPD) at room temperature. High-density ceramic pellets free of any additives were obtained after compaction of the obtained powders and subsequent sintering at 1600 °C for 4 h in air. Rietveld analysis of X-ray diffraction (XRD) pattern of sintered sample showed that the unit cell parameter of the obtained Gd2Hf2O7is 10.5501 (2) Å with x value = 0.345(2) in Wyckoff positions, indicating small distortion o...f octahedra. Hardness of the sintered samples was found to be 7.1 GPa. The thermal conductivity measurements performed in temperature range from room temperature to 1000 °C showed that thermal diffusivity of sintered samples was between 0.5 and 1 mm2/s whereas thermal conductivity was between 4 and 7 W/(m K).
Кључне речи:
pyrochlore / Gd2Hf2O7 / low-temperature synthesis / phase evolution / sinterability / thermal conductivityИзвор:
Ceramics International, 2018, 44, 14, 16972-16976Финансирање / пројекти:
- Синтеза, процесирање и карактеризација наноструктурних материјала за примену у области енергије, механичког инжењерства, заштите животне стредине и биомедицине (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45012)
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology (2-12-1- N1-29)
DOI: 10.1016/j.ceramint.2018.06.138
ISSN: 0272-8842; 1873-3956
WoS: 000442714100108
Scopus: 2-s2.0-85048929718
URI
https://linkinghub.elsevier.com/retrieve/pii/S0272884218315827https://vinar.vin.bg.ac.rs/handle/123456789/7817
Институција/група
VinčaTY - JOUR AU - Matović, Branko AU - Maletaškić, Jelena AU - Bučevac, Dušan AU - Zagorac, Jelena B. AU - Fajar, Muhammad AU - Yoshida, Katsumi AU - Yano, Toyohiko PY - 2018 UR - https://linkinghub.elsevier.com/retrieve/pii/S0272884218315827 UR - https://vinar.vin.bg.ac.rs/handle/123456789/7817 AB - Pyrochlore compound (Gd2Hf2O7) powder was prepared by reacting gadolinium nitrate and hafnium chloride with NaOH during solid state displacement reaction at low temperature (SSDR). The SSDR process at room temperature initially yielded amorphous powders, which crystallized after subsequent calcination to form crystalline ceramics. The formation of crystalline Gd2Hf2O7took place at temperature as low as 600 °C. The phase evolution with thermal treatment as well as powder properties such as crystallite size, lattice strain and lattice parameter were studied by X-ray powder diffraction (XRPD) at room temperature. High-density ceramic pellets free of any additives were obtained after compaction of the obtained powders and subsequent sintering at 1600 °C for 4 h in air. Rietveld analysis of X-ray diffraction (XRD) pattern of sintered sample showed that the unit cell parameter of the obtained Gd2Hf2O7is 10.5501 (2) Å with x value = 0.345(2) in Wyckoff positions, indicating small distortion of octahedra. Hardness of the sintered samples was found to be 7.1 GPa. The thermal conductivity measurements performed in temperature range from room temperature to 1000 °C showed that thermal diffusivity of sintered samples was between 0.5 and 1 mm2/s whereas thermal conductivity was between 4 and 7 W/(m K). T2 - Ceramics International T1 - Synthesis, characterization and sintering of Gd2Hf2O7 powders synthesized by solid state displacement reaction at low temperature VL - 44 IS - 14 SP - 16972 EP - 16976 DO - 10.1016/j.ceramint.2018.06.138 ER -
@article{ author = "Matović, Branko and Maletaškić, Jelena and Bučevac, Dušan and Zagorac, Jelena B. and Fajar, Muhammad and Yoshida, Katsumi and Yano, Toyohiko", year = "2018", abstract = "Pyrochlore compound (Gd2Hf2O7) powder was prepared by reacting gadolinium nitrate and hafnium chloride with NaOH during solid state displacement reaction at low temperature (SSDR). The SSDR process at room temperature initially yielded amorphous powders, which crystallized after subsequent calcination to form crystalline ceramics. The formation of crystalline Gd2Hf2O7took place at temperature as low as 600 °C. The phase evolution with thermal treatment as well as powder properties such as crystallite size, lattice strain and lattice parameter were studied by X-ray powder diffraction (XRPD) at room temperature. High-density ceramic pellets free of any additives were obtained after compaction of the obtained powders and subsequent sintering at 1600 °C for 4 h in air. Rietveld analysis of X-ray diffraction (XRD) pattern of sintered sample showed that the unit cell parameter of the obtained Gd2Hf2O7is 10.5501 (2) Å with x value = 0.345(2) in Wyckoff positions, indicating small distortion of octahedra. Hardness of the sintered samples was found to be 7.1 GPa. The thermal conductivity measurements performed in temperature range from room temperature to 1000 °C showed that thermal diffusivity of sintered samples was between 0.5 and 1 mm2/s whereas thermal conductivity was between 4 and 7 W/(m K).", journal = "Ceramics International", title = "Synthesis, characterization and sintering of Gd2Hf2O7 powders synthesized by solid state displacement reaction at low temperature", volume = "44", number = "14", pages = "16972-16976", doi = "10.1016/j.ceramint.2018.06.138" }
Matović, B., Maletaškić, J., Bučevac, D., Zagorac, J. B., Fajar, M., Yoshida, K.,& Yano, T.. (2018). Synthesis, characterization and sintering of Gd2Hf2O7 powders synthesized by solid state displacement reaction at low temperature. in Ceramics International, 44(14), 16972-16976. https://doi.org/10.1016/j.ceramint.2018.06.138
Matović B, Maletaškić J, Bučevac D, Zagorac JB, Fajar M, Yoshida K, Yano T. Synthesis, characterization and sintering of Gd2Hf2O7 powders synthesized by solid state displacement reaction at low temperature. in Ceramics International. 2018;44(14):16972-16976. doi:10.1016/j.ceramint.2018.06.138 .
Matović, Branko, Maletaškić, Jelena, Bučevac, Dušan, Zagorac, Jelena B., Fajar, Muhammad, Yoshida, Katsumi, Yano, Toyohiko, "Synthesis, characterization and sintering of Gd2Hf2O7 powders synthesized by solid state displacement reaction at low temperature" in Ceramics International, 44, no. 14 (2018):16972-16976, https://doi.org/10.1016/j.ceramint.2018.06.138 . .