Sumitomo Electric Industries, Limited

Akiko Funakoshi

Masatoshi Majima

Yoshiaki Tamura

Naho Mizuhara

Satoshi Tanaka

Takahiro Higashino

Hiromasa Tawarayama

Hirotaka Sakuma

Mitsuyasu Ogawa

Yohei Noda

A proton-conductive cell structure includes an air electrode, a hydrogen electrode, and a solid electrolyte layer disposed between the air electrode and the hydrogen electrode, wherein the solid electrolyte layer includes at least a first solid electrolyte layer formed of a compact material. The first solid electrolyte layer includes a metal oxide having a perovskite structure and represented by Formula 1 below, a ratio of Sr to a total amount of Ba and Sr in an air-electrode-side near-surface region of the first solid electrolyte layer is 0.4 or more, and a ratio of Sr to a total amount of Ba and Sr in a hydrogen-electrode-side near-surface region of the first solid electrolyte layer is 0.003 to 0.3.BaSrAMO  (1).

Proton-conductive cell structure, proton-conductive material, electrochemical device, and method of manufacturing proton-conductive material

An optical fiber includes a core, and a cladding. When a refractive index of silica glass is set as n, a refractive index of the core is set as n, and a refractive index of the cladding is set as n, a relative refractive index difference Δ defined by Expression (1):Δ[%]=100×()/2  (1)is 0.2% or higher. A ratio of a maximum value of a concentration of the dopant composed of the alkali metal element or the alkaline-earth metal element in the cladding to a maximum value of a concentration of the dopant composed of the alkali metal element or the alkaline-earth metal element in the core is 0.06 or higher and 0.25 or lower.

Optical fiber

The present embodiment relates to an optical fiber preform producing method for effectively suppressing breaking of symmetry of refractive index profile defined on a cross section of an optical fiber preform. In the present embodiment, when producing a center glass rod forming a part of the optical fiber preform, prior to grinding an outer peripheral portion of an intermediate glass rod in which an element-doped region is formed by collapse, an non-defective article determination regarding the intermediate glass rod to be a grinding target is performed.

Method for producing optical fiber preform

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Yokohama, Japan

Akiko Funakoshi