Preparation and dielectric properties of CuAlO2 ceramics
Апстракт
Within this work, the focus was on preparation of the delafossite CuAlO2 single phase powder and ceramic with a high density by the solid state synthesis, and on dielectric properties of the as-synthesized ceramic. The reaction between the nanoboehmite γ-AlOOH, with a high specific surface area, and the Cu2O, with the particles below 1 μm, was enhanced by comminution in a high energy mill, which resulted in reduction of the particle size and consequently shorter diffusion paths between constituent powders. The phase pure CuAlO2 powder was synthesized upon heating the reagent powder mixture two times for 10 h at 1100oC in the inert argon atmosphere as confirmed by the X-ray analysis. The ceramic with 86% of theoretical density was obtained after sintering the CuAlO2 powder compact at 1100oC for 2 h in air. According to the X-ray analysis the ceramic sample was single-phase. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafoss...ite matrix. However, traces of Cu-rich impurities have been identified at the surface of the pellets by the EDXS analysis. The semiconducting nature of the ceramic sample was confirmed by the temperature dependent dielectric parameters measurements (ε’ and tgδ) in the 10 kHZ-1MHz frequency range between 297 and 473 K.
Кључне речи:
CuAlO2 / Hedvall effect / SEM / dynamic shrinkage vs. temperature / XRDИзвор:
48th International Conference on Microelectronics, Devices and Materials with the Workshop on Ceramic Microsystems, 2012, 151-156Институција/група
Institut za multidisciplinarna istraživanjaTY - CONF AU - Vojisavljević, Katarina AU - Malič, Barbara AU - Mamoru, Senna AU - Drnovšek, Silvo AU - Kosec, Marija PY - 2012 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2910 AB - Within this work, the focus was on preparation of the delafossite CuAlO2 single phase powder and ceramic with a high density by the solid state synthesis, and on dielectric properties of the as-synthesized ceramic. The reaction between the nanoboehmite γ-AlOOH, with a high specific surface area, and the Cu2O, with the particles below 1 μm, was enhanced by comminution in a high energy mill, which resulted in reduction of the particle size and consequently shorter diffusion paths between constituent powders. The phase pure CuAlO2 powder was synthesized upon heating the reagent powder mixture two times for 10 h at 1100oC in the inert argon atmosphere as confirmed by the X-ray analysis. The ceramic with 86% of theoretical density was obtained after sintering the CuAlO2 powder compact at 1100oC for 2 h in air. According to the X-ray analysis the ceramic sample was single-phase. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafossite matrix. However, traces of Cu-rich impurities have been identified at the surface of the pellets by the EDXS analysis. The semiconducting nature of the ceramic sample was confirmed by the temperature dependent dielectric parameters measurements (ε’ and tgδ) in the 10 kHZ-1MHz frequency range between 297 and 473 K. C3 - 48th International Conference on Microelectronics, Devices and Materials with the Workshop on Ceramic Microsystems T1 - Preparation and dielectric properties of CuAlO2 ceramics EP - 156 SP - 151 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2910 ER -
@conference{ author = "Vojisavljević, Katarina and Malič, Barbara and Mamoru, Senna and Drnovšek, Silvo and Kosec, Marija", year = "2012", abstract = "Within this work, the focus was on preparation of the delafossite CuAlO2 single phase powder and ceramic with a high density by the solid state synthesis, and on dielectric properties of the as-synthesized ceramic. The reaction between the nanoboehmite γ-AlOOH, with a high specific surface area, and the Cu2O, with the particles below 1 μm, was enhanced by comminution in a high energy mill, which resulted in reduction of the particle size and consequently shorter diffusion paths between constituent powders. The phase pure CuAlO2 powder was synthesized upon heating the reagent powder mixture two times for 10 h at 1100oC in the inert argon atmosphere as confirmed by the X-ray analysis. The ceramic with 86% of theoretical density was obtained after sintering the CuAlO2 powder compact at 1100oC for 2 h in air. According to the X-ray analysis the ceramic sample was single-phase. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafossite matrix. However, traces of Cu-rich impurities have been identified at the surface of the pellets by the EDXS analysis. The semiconducting nature of the ceramic sample was confirmed by the temperature dependent dielectric parameters measurements (ε’ and tgδ) in the 10 kHZ-1MHz frequency range between 297 and 473 K.", journal = "48th International Conference on Microelectronics, Devices and Materials with the Workshop on Ceramic Microsystems", title = "Preparation and dielectric properties of CuAlO2 ceramics", pages = "156-151", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2910" }
Vojisavljević, K., Malič, B., Mamoru, S., Drnovšek, S.,& Kosec, M.. (2012). Preparation and dielectric properties of CuAlO2 ceramics. in 48th International Conference on Microelectronics, Devices and Materials with the Workshop on Ceramic Microsystems, 151-156. https://hdl.handle.net/21.15107/rcub_rimsi_2910
Vojisavljević K, Malič B, Mamoru S, Drnovšek S, Kosec M. Preparation and dielectric properties of CuAlO2 ceramics. in 48th International Conference on Microelectronics, Devices and Materials with the Workshop on Ceramic Microsystems. 2012;:151-156. https://hdl.handle.net/21.15107/rcub_rimsi_2910 .
Vojisavljević, Katarina, Malič, Barbara, Mamoru, Senna, Drnovšek, Silvo, Kosec, Marija, "Preparation and dielectric properties of CuAlO2 ceramics" in 48th International Conference on Microelectronics, Devices and Materials with the Workshop on Ceramic Microsystems (2012):151-156, https://hdl.handle.net/21.15107/rcub_rimsi_2910 .