{"title":"Microwave Properties of Low‐Temperature Co‐Fired Ceramic Systems","authors":"R. Geyer, L. Chai, A. Shaikh, V. Stygar","doi":"10.1002/9781118380802.CH25","DOIUrl":"https://doi.org/10.1002/9781118380802.CH25","url":null,"abstract":"","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"1 1","pages":"261-285"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90157283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Wada, T. Hoshina, Hiroaki Yasuno, Masanori Ohishi, H. Kakemoto, T. Tsurumi, M. Yashima
{"title":"Size Effect of Dielectric Properties for Barium Titnate Particles and Its Model Using Two Factors","authors":"S. Wada, T. Hoshina, Hiroaki Yasuno, Masanori Ohishi, H. Kakemoto, T. Tsurumi, M. Yashima","doi":"10.1002/9781118408162.CH2","DOIUrl":"https://doi.org/10.1002/9781118408162.CH2","url":null,"abstract":"The powder dielectric measurement of barium titanate (BaTiO 3 ) fine particles with sizes from 17 to 1,000 nm revealed the maximum dielectric constant at a certain particle size. Moreover, the sizes with maximum dielectric constants were strongly dependent on the preparation methods. When the BaTiO 3 fine particles were prepared using the original 2-step thermal decomposition method, a dielectric constant maximum of 15,000 was observed at 70 nm particle size. On the other hand, when the BaTiO 3 fine particles were prepared using the modified 3-step thermal decomposition method, a dielectric constant maximum of 5,000 was observed at 140 nm. The former BaTiO 3 was prepared in vacuum of 10 -2 torr while the latter BaTiO 3 was prepared in air. Structure refinement of BaTiO 3 particles using a Rietveld method revealed that all of BaTiO 3 particles were always composed of two parts; (a) surface cubic layer and (b) bulk tetragonal layer. Moreover, a thickness of surface cubic layer for BaTiO 3 nanoparticles prepared in vacuum of 10 -2 torr was much thinner than that for BaTiO 3 nanoparticles prepared in air. Thus, to explain these differences, a new model on the basis of \"surface relaxation\" was proposed.","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"30 3 1","pages":"15-26"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78624067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Interlaminar Tension/Shear Properties and Stress Rupture in Shear of Various Continuous Fiber‐Reinforced Ceramic Matrix Composites","authors":"Sung R. Choi, N. Bansal","doi":"10.1002/9781118407844.CH11","DOIUrl":"https://doi.org/10.1002/9781118407844.CH11","url":null,"abstract":"Interlaminar tensile and shear strengths of six different fiber-reinforced ceramic matrix composites were determined at ambient temperature with transthickness tension and double-notch shear test methods, respectively. Overall, interlaminar shear strength was about three times greater than interlaminar tensile strength for the composites considered. Some size effect on interlaminar shear strength was observed for SiC/SiC composites. Rate dependency of shear strength of a Hi-Nic SiC/SiC composite was also determined at 1316 °C in air using constant shear stress-rate testing. Degradation of interlaminar shear strength with decreasing shear stress rate, termed rate dependency or delayed failure, was observed. A previously proposed phenomenological model was used to account for and to quantify the rate dependency of interlaminar shear strength of the composite. Additional stress rupture testing in shear for the same SiC/SiC composite was conducted at 1316 °C in air to validate the proposed model. Notwithstanding the limited number of test specimens used, the model was in reasonable agreement with the stress rupture data.","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"1 1","pages":"117-134"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75638683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Gutiérrez-Mora, A. Domínguez-Rodríguez, K. Goretta, Dileep Singh, J. Routbort, G. C. Lukey, J. Deventer
{"title":"High-temperature deformation of a geopolymer.","authors":"F. Gutiérrez-Mora, A. Domínguez-Rodríguez, K. Goretta, Dileep Singh, J. Routbort, G. C. Lukey, J. Deventer","doi":"10.1002/9781118407844.CH21","DOIUrl":"https://doi.org/10.1002/9781118407844.CH21","url":null,"abstract":"Compressive creep under constant load (stresses of 0.5-10 MPa) of a geopolymer was investigated between 975 and 1025°C. The geopolymer was derived from Class F fly ash, kaolin, granulated blast furnace slag, sodium and potassium silicate and carbonate. Silicate-based aggregates constituted 48% of the total mass. The temperature range of testing was small because of limited plasticity below 975°C and decomposition above 1050°C. The maximum accumulated strain was 15%. A regime of true steady-state creep probably did not exist. Damage occurred at aggregate/geopolymer interfaces, induced in part by the stress concentrations there. Microstructural evolution was also observed, with calcium segregating from the geopolymer matrix toward the aggregates interfaces. The tests revealed that the geopolymer supported modest compressive stresses and exhibited significant strain or pseudo-plasticity.","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"103 1","pages":"237-244"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73093701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Internal Stress and Capacitance Aging of BME‐MLCCS","authors":"Y. Nakano, T. Nomura","doi":"10.1002/9781118408162.CH29","DOIUrl":"https://doi.org/10.1002/9781118408162.CH29","url":null,"abstract":"The residual stress and capacitance aging of base metal electrode multilayer ceramic capacitors (BME-MLCCs) has been studied. Residual stress measurement by X-ray diffraction revealed that tensile stress inside MLCCs in the thickness direction increased with increasing number of dielectric layers. The increase in the ratio of the c-axis to the a-axis of BaTiO 3 in the thickness direction of MLCCs was expected from the results of X-ray diffraction with increasing number of dielectric layers. And the dependence of residual stress on capacitance aging was measured of MLCCs with different number of dielectric layers. Capacitance aging depended on the applied voltage and temperature, however capacitance aging under no-load did not depend on the internal stress, because of the change of internal stress of BME-MLCCs with time was small.","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"14 1","pages":"267-273"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73095216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. W. Liu, Y. Lin, J. Weaver, W. Donner, Xin Chen, I. C. L. Chen, H. D. Lee, W. Chu, Jiechao Jiang, E. Meletis, A. Bhalla
{"title":"High Dielectric Tunability Ferroelectric (Pb,Sr)TIO3 Thin Films for Room Temperature Tunable Microwave Devices","authors":"S. W. Liu, Y. Lin, J. Weaver, W. Donner, Xin Chen, I. C. L. Chen, H. D. Lee, W. Chu, Jiechao Jiang, E. Meletis, A. Bhalla","doi":"10.1002/9781118407202.CH6","DOIUrl":"https://doi.org/10.1002/9781118407202.CH6","url":null,"abstract":"","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"53 1","pages":"43-49"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73101284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Gu, Hongbo Liu, Zhongxiang Zhou, R. Pattnaik, J. Toulouse, A. Bhalla, R. Guo
{"title":"Growth of single crystal ferroelectric fibers and tapers for all fiber network applications","authors":"M. Gu, Hongbo Liu, Zhongxiang Zhou, R. Pattnaik, J. Toulouse, A. Bhalla, R. Guo","doi":"10.1002/9781118408162.CH32","DOIUrl":"https://doi.org/10.1002/9781118408162.CH32","url":null,"abstract":"Growth of ferroelectric single crystal fibers of LiNbO 3 , both undoped, MgO added, and Er, Ce, Yb-doped, by using the laser heated pedestal growth technique, has been explored with success in obtaining designed orientation ( and growth directions), shape/form (tapered and twisted structures), and dimension (approaching 100 μm dia.). This paper reports growth of fine dimension LiNbO 3 crystal fibers for integrating them into uninterrupted all-fiber optic network links. Preliminary results on doping distribution and lattice parameters are also reported.","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"1 1","pages":"297-304"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84123400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Engineering the Composition Profile in Functionally Graded Materials Processed by Electrophoretic Deposition","authors":"G. Anné, J. Vleugels, O. Biest","doi":"10.1002/9781118408391.CH5","DOIUrl":"https://doi.org/10.1002/9781118408391.CH5","url":null,"abstract":"Electrophoretic deposition (EPD) allows the formation of functionally graded materials (FGM) by depositing powder from a suspension to which a second suspension is continuously added during the process. The deposition yield is described as a function of time and starting composition of the suspensions, resulting in a model of the EPD process that allows the composition gradient in the green deposit as well as in the sintered material to be predicted. The model developed enables to calculate the composition gradient in the FGM material from the starting composition of the suspensions, the EPD operating parameters and the powder-specific EPD characteristics. The model was verified for the ZrO2-Al 2 O 3 system. Because of the excellent correlation between the predicted and the measured concentration profiles, the described model allows to precisely engineer and design the composition profile in FGM materials produced by EPD.","PeriodicalId":83360,"journal":{"name":"Transactions (English Ceramic Circle)","volume":"GE-24 1","pages":"43-52"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84616163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}