With the rapid development of electronic device performances, it is crucial to provide an efficient heat removal in electronic devices. For thermal management, ceramic particle/polymer composite materials with high thermal conductivities are of interest. Recently, hexagonal boron nitride (hBN) particles and related composite materials have been intensely studied due to the excellent properties of hBN particles. The shape and orientation of the hBN particles affect the properties of the composite materials because hBN is a plate-like particle and has an anisotropic thermal conductivity. This article provides an overview of powder technologies of hBN particles, such as exfoliation, granulation, and composition with nanofibers, for high thermal conductivities of composite materials. Furthermore, I discuss the fabrication processes and thermal properties of hBN/polymer composite materials potentially applicable in thermal interface materials.
{"title":"Review on powder technologies for hexagonal boron nitride/polymer composites with high thermal conductivities","authors":"Yuichi Tominaga","doi":"10.2109/jcersj2.23109","DOIUrl":"https://doi.org/10.2109/jcersj2.23109","url":null,"abstract":"With the rapid development of electronic device performances, it is crucial to provide an efficient heat removal in electronic devices. For thermal management, ceramic particle/polymer composite materials with high thermal conductivities are of interest. Recently, hexagonal boron nitride (hBN) particles and related composite materials have been intensely studied due to the excellent properties of hBN particles. The shape and orientation of the hBN particles affect the properties of the composite materials because hBN is a plate-like particle and has an anisotropic thermal conductivity. This article provides an overview of powder technologies of hBN particles, such as exfoliation, granulation, and composition with nanofibers, for high thermal conductivities of composite materials. Furthermore, I discuss the fabrication processes and thermal properties of hBN/polymer composite materials potentially applicable in thermal interface materials.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.2109/jcersj2.131.h11-1
{"title":"Cover","authors":"","doi":"10.2109/jcersj2.131.h11-1","DOIUrl":"https://doi.org/10.2109/jcersj2.131.h11-1","url":null,"abstract":"","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135162290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimized preparation of <i>c</i>-axis-aligned polycrystal of doped lanthanum silicate oxyapatite and evaluation of its electrical properties","authors":"Koichiro Fukuda, Shu Okada, Iori Terao, Atsushi Mineshige, Daisuke Urushihara, Toru Asaka","doi":"10.2109/jcersj2.23127","DOIUrl":"https://doi.org/10.2109/jcersj2.23127","url":null,"abstract":"","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135216085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Quantitative analysis of oxidation state of iron included in glass","authors":"Chihiro Sakai, Yukihito Nagashima","doi":"10.2109/jcersj2.23130","DOIUrl":"https://doi.org/10.2109/jcersj2.23130","url":null,"abstract":"","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135216941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Solvothermal synthesis of Li<sub>3</sub>BO<sub>3</sub>-coated graphite powder as an anode material for all-solid-state lithium batteries","authors":"Hirosuke Sonomura, Tomoatsu Ozaki, Yasunori Hasegawa, Yoshiaki Sakurai, Masanobu Chiku","doi":"10.2109/jcersj2.23123","DOIUrl":"https://doi.org/10.2109/jcersj2.23123","url":null,"abstract":"","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135166044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiefeng Wang, Xiaofeng Yuan, Jun Li, Qiushi Wang, Wentao Xiong, Taiang Song
After a long time of exploration, the solid-state reaction method is further modified. In the granulation process, 10 % isopropanol is added into ethanol to increase the viscosity. More than that, the green body of the ceramic is placed into the isostatic press and pressed at 200 MPa for 3 min again after being kept in the muffle furnace at 120 °C for 1 h. The modified solid-state reaction method further improves the sintering property of the Na2WO4 ceramic, which increases the dielectric property of the ceramic sample greatly. Besides, the granulation problem, the bubble problem and the problem in demoulding process are solved. The substitution of ethanol and isopropanol for polyvinyl ethanol (PVA) completely avoids the residue of PVA in the ceramic sample and increases the fluidity of the ceramic particles in the granulation process. As a result, the Na2WO4 ceramic can be sintered well at 560 °C with a relative permittivity of 5.82, Q × f value of 131300 GHz and a temperature coefficient of resonant frequency (TCF) value of −56.2 ppm/°C in this work. The modified solid-state reaction method is a good substitute for the conventional solid-state method.
{"title":"Investigation into the effect on the property of Na<sub>2</sub>WO<sub>4</sub> ceramic prepared by the further modified solid-state reaction method","authors":"Jiefeng Wang, Xiaofeng Yuan, Jun Li, Qiushi Wang, Wentao Xiong, Taiang Song","doi":"10.2109/jcersj2.23122","DOIUrl":"https://doi.org/10.2109/jcersj2.23122","url":null,"abstract":"After a long time of exploration, the solid-state reaction method is further modified. In the granulation process, 10 % isopropanol is added into ethanol to increase the viscosity. More than that, the green body of the ceramic is placed into the isostatic press and pressed at 200 MPa for 3 min again after being kept in the muffle furnace at 120 °C for 1 h. The modified solid-state reaction method further improves the sintering property of the Na2WO4 ceramic, which increases the dielectric property of the ceramic sample greatly. Besides, the granulation problem, the bubble problem and the problem in demoulding process are solved. The substitution of ethanol and isopropanol for polyvinyl ethanol (PVA) completely avoids the residue of PVA in the ceramic sample and increases the fluidity of the ceramic particles in the granulation process. As a result, the Na2WO4 ceramic can be sintered well at 560 °C with a relative permittivity of 5.82, Q × f value of 131300 GHz and a temperature coefficient of resonant frequency (TCF) value of −56.2 ppm/°C in this work. The modified solid-state reaction method is a good substitute for the conventional solid-state method.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.2109/jcersj2.131.a11-1
{"title":"Call for a Guest Editor for a Special Issue","authors":"","doi":"10.2109/jcersj2.131.a11-1","DOIUrl":"https://doi.org/10.2109/jcersj2.131.a11-1","url":null,"abstract":"","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135162049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kota Suzuki, Jinan Cui, Jiang Peilu, Hanseul Kim, Yumi Yamaguchi, Satoshi Hori, Masaaki Hirayama, Ryoji Kanno
In this study, high-sulfur-containing carbon replica (sulfur-rich S-CR) composites were prepared using a melt-diffusion method. Melt diffusion under vacuum enabled the introduction of four times the weight ratio of sulfur into the mesopores of a carbon replica (CR). The obtained sulfur-rich S-CR exhibited an initial discharge capacity of 700 mAh gsulfur−1, indicating the low utilization of sulfur in the composite. The classification of the particle sizes of the solid electrolyte and CR contributed to the improvement in electrochemical performance. An initial discharge capacity of over 1,200 mAh g−1 was confirmed for the S-CR composite using the smaller solid electrolyte and CR prepared via a dry classification process. An analysis of the effect of the additives indicated that the rational design of electronic and ionic conduction pathways is required for higher cycle performance when using sulfur-rich S-CRs.
本研究采用熔融扩散法制备了高含硫碳副本(富硫S-CR)复合材料。熔体在真空下的扩散使硫的重量比增加了四倍，从而进入了碳复制品(CR)的介孔。得到的富硫S-CR的初始放电容量为700 mAh g硫- 1，表明复合材料中硫的利用率较低。固体电解质和CR的粒径分级有助于电化学性能的提高。使用更小的固体电解质和通过干燥分类工艺制备的CR, S-CR复合材料的初始放电容量超过1200 mAh g - 1。对添加剂的影响分析表明，在使用富硫s - cr时，合理设计电子和离子传导途径是提高循环性能的必要条件。
{"title":"Sulfur-rich composite cathodes using carbon replica frameworks for all-solid-state lithium–sulfur batteries","authors":"Kota Suzuki, Jinan Cui, Jiang Peilu, Hanseul Kim, Yumi Yamaguchi, Satoshi Hori, Masaaki Hirayama, Ryoji Kanno","doi":"10.2109/jcersj2.23018","DOIUrl":"https://doi.org/10.2109/jcersj2.23018","url":null,"abstract":"In this study, high-sulfur-containing carbon replica (sulfur-rich S-CR) composites were prepared using a melt-diffusion method. Melt diffusion under vacuum enabled the introduction of four times the weight ratio of sulfur into the mesopores of a carbon replica (CR). The obtained sulfur-rich S-CR exhibited an initial discharge capacity of 700 mAh gsulfur−1, indicating the low utilization of sulfur in the composite. The classification of the particle sizes of the solid electrolyte and CR contributed to the improvement in electrochemical performance. An initial discharge capacity of over 1,200 mAh g−1 was confirmed for the S-CR composite using the smaller solid electrolyte and CR prepared via a dry classification process. An analysis of the effect of the additives indicated that the rational design of electronic and ionic conduction pathways is required for higher cycle performance when using sulfur-rich S-CRs.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135369903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two-types of phase-field (PF) calculations were developed to predict the crystallization of borides. The first calculation used an empirical PF mobility [Lexp = A(kBTΔT/6π2λ3η)B], which was determined from experimental crystal growth rates (vexp). The calculation results for various binary borides such as Li2O–2B2O3, Na2O–2B2O3, Na2O–4B2O3, K2O–4B2O3, BaO–2B2O3, and PbO–2B2O3, agreed well with the experimental vexp below their melting points. Furthermore, the A and B values of the Lexp for the borides depended on diffusivity and cation molar mass, including that it is important for cation transfers during crystallization. The second calculation solved the PF equation using versatile PF mobility (L′ ∼ rD/κ2), in which an interfacial process (r) was included. The calculation results agreed well with the first calculation results and the experimental vexp, except for Li2O–2B2O3. In Li2O–2B2O3, the interfacial process strongly affected the crystal growth rates because of the strong nonlinear phenomenon. For diffusive ceramics such as Li2O–2B2O3, we should use the empirical Lexp. However, the versatile PF equation, which includes the interfacial process (L′) can predict the vexp of many borides.
{"title":"Prediction for crystal growth rates in borides under supercooled temperature conditions","authors":"Munemichi Kawaguchi, Masayoshi Uno","doi":"10.2109/jcersj2.23111","DOIUrl":"https://doi.org/10.2109/jcersj2.23111","url":null,"abstract":"Two-types of phase-field (PF) calculations were developed to predict the crystallization of borides. The first calculation used an empirical PF mobility [Lexp = A(kBTΔT/6π2λ3η)B], which was determined from experimental crystal growth rates (vexp). The calculation results for various binary borides such as Li2O–2B2O3, Na2O–2B2O3, Na2O–4B2O3, K2O–4B2O3, BaO–2B2O3, and PbO–2B2O3, agreed well with the experimental vexp below their melting points. Furthermore, the A and B values of the Lexp for the borides depended on diffusivity and cation molar mass, including that it is important for cation transfers during crystallization. The second calculation solved the PF equation using versatile PF mobility (L′ ∼ rD/κ2), in which an interfacial process (r) was included. The calculation results agreed well with the first calculation results and the experimental vexp, except for Li2O–2B2O3. In Li2O–2B2O3, the interfacial process strongly affected the crystal growth rates because of the strong nonlinear phenomenon. For diffusive ceramics such as Li2O–2B2O3, we should use the empirical Lexp. However, the versatile PF equation, which includes the interfacial process (L′) can predict the vexp of many borides.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We have prepared a dense ceramic sample of a novel thermoelectric sulfide Ta2PdS6 by means of spark plasma sintering technique under a uniaxial pressure. The Rietveld analyses of the X-ray diffraction patterns have clarified occurrence of weak preferred orientation in the sintering process. Resistivity, thermopower, and Hall resistivity measurements on the ceramic sample have indicated that it shows higher carrier density and lower carrier mobility than a single crystal. The inferior carrier mobility in the ceramic sample may partly come from increased point-defect and/or grain-boundary scattering, to which poor power factor is attributed.
{"title":"Spark plasma sintering on the thermoelectric sulfide Ta<sub>2</sub>PdS<sub>6</sub>","authors":"Akitoshi Nakano, Koichiro Suekuni, Nanako Hattori, Ichiro Terasaki","doi":"10.2109/jcersj2.23038","DOIUrl":"https://doi.org/10.2109/jcersj2.23038","url":null,"abstract":"We have prepared a dense ceramic sample of a novel thermoelectric sulfide Ta2PdS6 by means of spark plasma sintering technique under a uniaxial pressure. The Rietveld analyses of the X-ray diffraction patterns have clarified occurrence of weak preferred orientation in the sintering process. Resistivity, thermopower, and Hall resistivity measurements on the ceramic sample have indicated that it shows higher carrier density and lower carrier mobility than a single crystal. The inferior carrier mobility in the ceramic sample may partly come from increased point-defect and/or grain-boundary scattering, to which poor power factor is attributed.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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