Hiroki Yamamoto
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Interests
Hiroki Yamamoto has a total of 7 co-authors. Here are the top co-authors by number of shared publications:
Hajime Murakami
Research and Development Group Hitachi, Ltd. 1-1, 7-Chome, Omika-cho, Hitachi Ibaraki 319-1292 Japan
1 shared publicationKatsuyoshi Furusawa
Magnetic Materials Research Laboratory Hitachi Metals, Ltd. 15-17, 2-Chome, Egawa, Shimamoto-cho, Mishima-gun Osaka 618-0013 Japan
1 shared publicationMotoyasu Terao
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-koigakubo, Kokubunji, Tokyo
1 shared publicationMotoyuki Miyata
Research and Development Group Hitachi, Ltd. 1-1, 7-Chome, Omika-cho, Hitachi Ibaraki 319-1292 Japan
1 shared publicationTakashi Naito
Hitachi Research Laboratory, Hitachi Ltd., 1-1 Saiwai-cho 3-chome, Hitachi, Ibaraki
1 shared publication- Tetsuya Uda
Kyoto University
1 shared publication
Latest Publications
- 15 March 2018
- Published by Wiley in ChemistrySelect
- Vol. 3 (11) , 2998-3002
Hidden Nature of the Conversion Reaction from Rare Earth Chloride to Oxychloride and the Application to Novel Separation
A mutual separation process that uses rare‐earth oxychloride in a proactive way was developed. In particular, the heat‐treatment conditions under which DyCl 3 is converted into DyOCl (without causing such conversion of NdCl 3 ) in dry oxygen with 6.5 ppm of H 2 O (dew point: 209 K) at a relatively low temperature (around 573 K) were determined. A difference between conversion reactions of the two kinds of rare‐earth chlorides into rare‐earth oxychlorides appeared in the case of an oxygen atmosphere with ultra‐low H 2 O content, although this difference is usually hidden in the presence of atmospheric humidity. Under these conditions, high separability of a NdCl 3 and DyCl 3 mixture was demonstrated.
- 15 March 2018
- Published by Wiley in ChemistrySelect
- Vol. 3 (11) , 2998-3002
Hidden Nature of the Conversion Reaction from Rare Earth Chloride to Oxychloride and the Application to Novel Separation
A mutual separation process that uses rare‐earth oxychloride in a proactive way was developed. In particular, the heat‐treatment conditions under which DyCl 3 is converted into DyOCl (without causing such conversion of NdCl 3 ) in dry oxygen with 6.5 ppm of H 2 O (dew point: 209 K) at a relatively low temperature (around 573 K) were determined. A difference between conversion reactions of the two kinds of rare‐earth chlorides into rare‐earth oxychlorides appeared in the case of an oxygen atmosphere with ultra‐low H 2 O content, although this difference is usually hidden in the presence of atmospheric humidity. Under these conditions, high separability of a NdCl 3 and DyCl 3 mixture was demonstrated.
- 1 March 1999
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 38 (3S) , 1656
A New Super-Resolution Film Applicable to Read-Only and Rewritable Optical Disks
A new super-resolution material for optical disks is proposed which contains cobalt oxide as a main component and shows a refractive index change upon irradiation of a laser beam. This new material is different from the ones already proposed for super-resolution in that it is durable against high-power laser irradiation and thus is applicable to rewritable optical disks as well as read-only (ROM) disks. This paper reports fundamental properties of this material, C/N improvement of ROM and phase-change disks with this material, and its durability against continuous many-time readout. The potential of this technique is discussed.
- 1 March 1999
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 38 (3S) , 1656
A New Super-Resolution Film Applicable to Read-Only and Rewritable Optical Disks
A new super-resolution material for optical disks is proposed which contains cobalt oxide as a main component and shows a refractive index change upon irradiation of a laser beam. This new material is different from the ones already proposed for super-resolution in that it is durable against high-power laser irradiation and thus is applicable to rewritable optical disks as well as read-only (ROM) disks. This paper reports fundamental properties of this material, C/N improvement of ROM and phase-change disks with this material, and its durability against continuous many-time readout. The potential of this technique is discussed.