{"691788":{"#nid":"691788","#data":{"type":"event","title":"MS Defense by Adarsh Kongani","body":[{"value":"\u003Cp\u003EAdarsh Kongani\u003Cbr\u003E(Advisor: Prof. Rosario Gerhardt)\u003C\/p\u003E\u003Cp\u003Ewill defend a master\u2019s thesis entitled,\u003C\/p\u003E\u003Cp\u003ECharacterization of LCM 3D-Printed and Spark Plasma Sintered Alumina Using Dielectric Spectroscopy\u003Cbr\u003EOn\u003Cbr\u003EThursday, August 20 at 12 p.m.\u003Cbr\u003ELove Room 210\u003Cbr\u003EAbstract\u003Cbr\u003ELCM (Lithographic-based Ceramic Manufacturing) is a 3D ceramic manufacturing technique developed by LITHOZ. A plethora of ceramic materials including alumina, zirconia, silicon nitride, and custom ceramic materials can be printed. Because of this LCM is used in many applications in addition to ceramic dielectrics. To understand how this processing technique affects the electronic properties of these printed dielectric ceramics, different print parameters \u2013 sintering temperature, layer height, and print orientation -- were changed. Alumina samples were printed by LITHOZ using their LCM printer. The alumina samples were sintered at either 1475\u00b0C or 1650\u00b0C with layer heights of 25 \u03bcm or 50 \u03bcm, and either the XY-orientation or the Z-orientation. The samples were characterized using SEM and optical imaging to look for voids and uniformity. \u0026nbsp;Impedance Spectroscopy was used to characterize the dielectric constant and dissipation factor. The permittivity gives an idea of the porosity due to the divergence from the dielectric constant of alumina which is expected to be 9.8. The higher sintering temperature and larger layer heights gave a higher dielectric constant (K) and higher densification. For the 50 \u03bcm layer sample with XY orientation, the 1475\u00b0C sample gave a K of 5.703 while the 1650\u00b0C sample gave a K of 8.6. The Z-orientation gave a lower K in all cases. In addition, the 1475 \u00b0C samples were heavily influenced by humidity. LCM was also compared to spark plasma sintering (SPS) to see how processing techniques affected electronic properties of alumina. SPS samples were made at 4 different sintering temperatures: 1400\u02daC, 1475\u02daC, 1500\u02daC, and 1650\u02daC using 0.3\u00b5m \uf061-alumina powder. The SPS samples had a much higher K compared to the LCM samples with values of 9.74 and 9.59 for 1475\u02daC and 1650\u02daC SPS samples respectively. However, there was carbon contamination in the samples during fabrication. The SPS samples were also denser compared to the LCM samples. Impedance and dielectric spectroscopy is a useful tool to monitor density and compositional variation.\u003Cbr\u003ECommittee\u003Cbr\u003E\u2022 Prof. Rosario Gerhardt \u2013 School of Materials Science and Engineering (advisor)\u003Cbr\u003E\u2022 Prof. Aaron Stebner\u2013 School of Materials Science and Engineering\u003Cbr\u003E\u2022 Prof. Blair Brettmann \u2013 School of Materials Science and Engineering\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003ECharacterization of LCM 3D-Printed and Spark Plasma Sintered Alumina Using Dielectric Spectroscopy\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EOn\u003C\/strong\u003E\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Characterization of LCM 3D-Printed and Spark Plasma Sintered Alumina Using Dielectric Spectroscopy On"}],"uid":"27707","created_gmt":"2026-08-19 14:05:26","changed_gmt":"2026-08-19 14:05:58","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2026-08-20T12:00:00-04:00","event_time_end":"2026-08-20T14:00:00-04:00","event_time_end_last":"2026-08-20T14:00:00-04:00","gmt_time_start":"2026-08-20 16:00:00","gmt_time_end":"2026-08-20 18:00:00","gmt_time_end_last":"2026-08-20 18:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Love Room 210","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"111531","name":"ms defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}