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Synthesis and lithium-ion conductivity for perovskite-type Li3/8Sr7/16Ta3/4Zr1/4O3 solid electrolyte by powder-bed sintering
Get PDFPerovskite-type compounds ABO3 in which A= La, Li and B = Ti (Li2/33xLaxTiO3, LLT) exhibit very high bulk ionic conductivity of 1.2 × 10-3 Scm-1 at 30°C, but LLT has very large grain-boundary resistance and is only stable above 1.61.8 V vs. Li/Li+ because Ti4+ can be easily reduced to Ti3+ below this potential. Li3/8Sr7/16Ta3/4Zr1/4O3
(LSTZ), in which A and B cations of SrZrO3 are partially substituted by Li and Ta, has been reported to be more stable against the lithiated negative electrode than LLT. In this paper, we synthesized LSTZ by using “powder-bed sintering” method, which is commonly used for preparation of dense garnet-structured lithium-ion conductor
Li7La3Zr2O12 (LLZ). At sintering process, the LSTZ pellet was covered with the same mother powder to suppress the excess Li loss during high temperature treatment and the formation of secondary phases. For LSTZ sintered with covering LSTZ mother powder, secondary phases such as SrTa2O6 and Sr2Ta2O7 were significantly reduced and LSTZ grains in the pellet were in good contact with each other. According to these improvement, the bulk and total (bulk + grain-boundary) ionic conductivity at 27°C of LSTZ attained to 3.5 × 10-4 Scm-1 and 2.7 × 10-4 Scm-1, respectively. The total conductivity at room temperature is approximately 3 times higher than that as
previously reported and comparable with LLT and LLZ.journal articl
Magneto-electric properties of magnetic field sensors fabricated using AlGaN/GaN heterostructures for harsh environments
Get PDF豊橋技術科学大学博士(工学)doctoral thesi
Measurement and application of residence time of plastic litter on beaches
Get PDF豊橋技術科学大学博士(工学)doctoral thesi
New Challenge for Bibliometrics :Development of the Altmetrics (Beyond Bibliometrics)
Get PDFインパクトファクターやh 指数など被引用数をもとにした指標により，学術情報の評価が行われてきた。2010 年前後より，被引用数にかわる評価指標として，ソーシャルメディアなどにおける言及の利用が試みられている。この指標はオルトメトリクスと総称される。本稿では，オルトメトリクスの概要，および，筆者が開発している国産オルトメトリクス計測サービスCeek.jp Altmetrics の開発について述べる。さらに，ソーシャルメディアなどにおける日本語文献の言及動向を報告し，今後の展望について述べる。
Academic information has been evaluated by citation-based indicators such as the Impact Factor and h-index. Since around 2010, mentions in social media have been used instead of citation-based indicators.
These indicators are called “Altmetrics”. This paper discusses the overview of altmetrics and the national altmetrics measurement service “Ceek.jp Altmetrics” that the author has been developing. In addition, the paper reports the trend of mentions for Japanese academic information in social media and discuss the future outlook.journal articl