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Journal Articles

Local structure analysis of BiFeO-BaTiO solid solutions

Yoneda, Yasuhiro; Kim, S.*; Mori, Shigeo*; Wada, Satoshi*

Japanese Journal of Applied Physics, 61(SN), p.SN1022_1 - SN1022_10, 2022/11

https://doi.org/10.35848/1347-4065/ac835d

Times Cited Count：1 Percentile：17.38(Physics, Applied)

Local structural analysis of the (1-) BiFeO-BaTiO solid solution was performed by PDF analysis of the data obtained in the synchrotron radiation high-energy X-ray diffraction experiment. First, when XAFS experiments were performed and sample screening was performed, it was found that structural fluctuations were large in the BiFeO-rich composition. Therefore, PDF analysis of a sample with BiFeO-rich composition was performed. As a result, it was found that although the average structure is a cubic structure, the local structure can be reproduced with a rhombohedral crystal structure, and there is a displacement that breaks the symmetry of the rhombohedral structure in a composition with a large fluctuation.

Journal Articles

Magnetic properties of R $_{2}$ Fe $_{3}$ O $_{7}$ (R=Yb and Lu)

Yoshii, Kenji; Ikeda, Naoshi*; Fukuyama, Ryota*; Nagata, Tomoko*; Kambe, Takashi*; Yoneda, Yasuhiro; Fukuda, Tatsuo; Mori, Shigeo*

Solid State Communications, 173, p.34 - 37, 2013/11

https://doi.org/10.1016/j.ssc.2013.08.030

Times Cited Count：4 Percentile：20.56(Physics, Condensed Matter)

We have investigated the magnetic properties of R $_{2}$ Fe $_{3}$ O $_{7}$ (R=Yb and Lu), which belongs to the homologous family of electronic ferroelectric RFe $_{2}$ O $_{4}$ . Magnetization measurements show ferrimagnetic ordering at the Neel temperature (T $_{N}$ ) of about 270 K, which is slightly higher than that of RFe $_{2}$ O $_{4}$ (T $_{N}$ about 230-250 K). Observation of spin glass and exchange bias shows a coexistence of ferromagnetic and antiferromagneticinteractions, similarly to RFe $_{2}$ O $_{4}$ . This situation gives rise to a complex magnetic change and a broad peak of magnetic entropy change. Some characteristics, such as refrigeration temperatures higher than in RFe $_{2}$ O $_{4}$ , seem to offer a possibility of this system to applications.

Journal Articles

Magnetic and dielectric properties of YbFe $_{2-x}$ Mn $_{x}$ O $_{4}$ (0x1)

Yoshii, Kenji; Ikeda, Naoshi*; Michiuchi, Takamasa*; Yokota, Yusuke*; Okajima, Yuka; Yoneda, Yasuhiro; Matsuo, Yoji*; Horibe, Yoichi*; Mori, Shigeo*

Journal of Solid State Chemistry, 182(7), p.1611 - 1618, 2009/06

https://doi.org/10.1016/j.jssc.2009.04.008

Times Cited Count：15 Percentile：51.45(Chemistry, Inorganic & Nuclear)

We have investigated the magnetic and dielectric properties of YbFe $_{2-x}$ Mn $_{x}$ O $_{4}$ (0x1), which is an Fe-site-substituted system of new multiferroic oxides RFe $_{2}$ O $_{4}$ (R=Y, Ho-Lu). X-ray diffraction measurements show that a solid solution is formed between YbFe $_{2}$ O $_{4}$ (x=0) and YbFeMnO $_{4}$ (x=1) for 0x1. The valence of the Mn ion is determined to be 2+, consistently with the suppression of low-temperature magnetization by the Mn substitution. The magnetic transition temperature and the dielectric constant decrease monotonically with increasing x. This result plausibly confirms that the magnetic and dielectric properties in oxides isostructural with RFe $_{2}$ O $_{4}$ are governed by the electron transfer between Fe-site ions, unlike ordinary ferroelectrics and dielectrics, in which the ionic displacement plays a key role. The possibility for application is briefly discussed.

Journal Articles

Local structure modulation in the electronic ferroelectric oxide LuFe $_{2}$ O $_{4}$

Hayakawa, Hironori*; Morimoto, Masanori*; Ikeda, Naoshi*; Yoneda, Yasuhiro; Kohara, Shinji*; Yoshii, Kenji; Matsuo, Yoji*; Michiuchi, Takamasa*; Mori, Shigeo*

Transactions of the Materials Research Society of Japan, 34(1), p.51 - 54, 2009/05

https://doi.org/10.14723/tmrsj.34.51

We have recently reported that LuFe $_{2}$ O $_{4}$ becomes ferroelectric below 330 K, owing to a charge-ordering transition of Fe ions. As details of the properties of this material have not been reported so far, we have investigated its local structure in the ferromagnetic phase by means of synchrotron X-ray diffraction. The analysis of pair-distribution function showed the existence of displacement of Lu atoms; this structure is different from the average structure of this materials known thus far. This result encourages a detailed reinvestigation of crystal structure of LuFe $_{2}$ O $_{4}$ . We also show the results obtained from some other experimental methods, such as dielectric measurement and electron diffraction.

Journal Articles

Magnetic and dielectric properties of HoFe $_{2}$ O $_{4}$ and R $_{1-x}$ R' $_{x}$ Fe $_{2}$ O $_{4}$ (R, R': rare earths)

Yoshii, Kenji; Yoneda, Yasuhiro; Maeda, Daisuke*; Yokota, Yusuke*; Michiuchi, Takamasa*; Komatsu, Takuma*; Ikeda, Naoshi*; Matsuo, Yoji*; Mori, Shigeo*

Japanese Journal of Applied Physics, 47(9), p.7599 - 7602, 2008/09

https://doi.org/10.1143/JJAP.47.7599

Times Cited Count：8 Percentile：33.28(Physics, Applied)

We have investigated the physical properties of HoFe $_{2}$ O $_{4}$ and R $_{1-x}$ R' $_{x}$ Fe $_{2}$ O $_{4}$ (R, R': rare earths). Dielectric measurements showed their dielectric constants of 1000 at around room temperature, which is characteristic of the RFe $_{2}$ O $_{4}$ series (R: rare earths). However, the magnetic transition temperatures and the coherency in dielectric response were found to be different from those of RFe $_{2}$ O $_{4}$ reported so far. Interestingly, these materials suggested higher ferroelectric temperatures than those reported so far, suggesting a possibility of application of these materials.

Journal Articles

Local structure of BiFeO-BaTiO mixture

Yoneda, Yasuhiro; Yoshii, Kenji; Kohara, Shinji*; Kitagawa, Shuji*; Mori, Shigeo*

Japanese Journal of Applied Physics, 47(9), p.7590 - 7594, 2008/09

https://doi.org/10.1143/JJAP.47.7590

Times Cited Count：24 Percentile：64.31(Physics, Applied)

Local structure analysis of (1-)BiFeO-BaTiO mixture was carried out by synchrotron radiation X-ray pair-distribution function (PDF) method. The PDF peak is resolved as a doublet due to the presence of two distinct bond length, Bi-O and Ba-O. Cubic perovskite lattice of (1-)BiFeO-BaTiO solid solution distorts locally to accomodate the distinct Bi-O and Ba-O bond lengths.

Journal Articles

Magnetic and dielectric properties of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ , and InGaCuO $_{4}$

Yoshii, Kenji; Ikeda, Naoshi*; Okajima, Yuka; Yoneda, Yasuhiro; Matsuo, Yoji*; Horibe, Yoichi*; Mori, Shigeo*

Inorganic Chemistry, 47(14), p.6493 - 6501, 2008/07

https://doi.org/10.1021/ic702365k

Times Cited Count：28 Percentile：73.55(Chemistry, Inorganic & Nuclear)

The magnetic and dielectric properties of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ and InGaCuO $_{4}$ have been investigated. All these materials areisostructural with RFe $_{2}$ O $_{4}$ (R=Y, Ho-Lu), which shows ferroelectricity due to iron-valence ordering. InFe $_{2}$ O $_{4}$ exhibits similar properties to those of RFe $_{2}$ O $_{4}$ ; the origins of the magnetic and dielectric phenomena are likely common in InFe $_{2}$ O $_{4}$ and RFe $_{2}$ O $_{4}$ . From measurements of the other two materials, we found that both the magnetic transition temperature and the dielectric constant are decreased in the order of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ and InGaCuO $_{4}$ . This result strongly supports the previously reported explanation based on an electron transfer between the Fe-site ions for the corresponding rare-earth systems. Therefore, we propose that the dielectric properties of the oxides isostructural with RFe $_{2}$ O $_{4}$ are plausibly governed by electron transfer; this situation is different from that of ordinary ferroelectrics and dielectrics, in which the displacement factions and anions is important. In addition, InFeCuO $_{4}$ and InGaCuO $_{4}$ exhibit large dielectric constants (larger than about 1500). Inconsideration of this property, the possible applications of these oxides are discussed.

Journal Articles

Magnetic and dielectric behavior of the ruthenium double perovskite oxides $_{2}$ RuO $_{6}$ (=La, Pr and Nd, =Mg, Co, Ni and Zn)

Yoshii, Kenji; Ikeda, Naoshi*; Mori, Shigeo*; Yoneda, Yasuhiro; Mizumaki, Masaichiro*; Tanida, Hajime*; Kawamura, Naomi*

Transactions of the Materials Research Society of Japan, 32(1), p.51 - 54, 2007/03

Magnetic and dielectric properties of the ruthenium double perovskites $_{2}$ RuO $_{6}$ were studied ( = Co, Ni, Zn, Mg). The materials with the magnetic M $^{2+}$ ions ( = Co and Ni) showed magnetic ordering and large dielectric constants (about 5000). On the other hand, for the non-magnetic M $^{2+}$ ions ( = Mg and Zn), magnetic ordering was not observed. In addition, their dielectric constants were found to be small (about 100-200). Together with the result of the dielectric response, the large dielectric constants for =Co and Ni may be related to a smooth response of polar regions. Investigations of the properties of $_{2}$ RuO $_{6}$ with =Pr and Nd are also being carried out, and their results are briefly discussed.

JAEA Reports

None

Yoneda, Shigeo*; *

PNC TJ7308 97-004, 136 Pages, 1997/03

PNC-TJ7308-97-004.pdf:8.99MB

JAEA Reports

None

Yoneda, Shigeo*; *; *

PNC TJ7308 97-001, 156 Pages, 1997/03

PNC-TJ7308-97-001.pdf:34.02MB

no abstracts in English

JAEA Reports

Collection of data for climate and sea level fluctuations during quaternary period

Ise, Akihiro*; Yoneda, Shigeo*

PNC TJ7308 96-001, 847 Pages, 1996/03

PNC-TJ7308-96-001.pdf:25.42MB

The geological and hydrogeological environments would have been influenced directly and indirectly by the fluctuationns of subaerial environments, e.g. climate and sea level. To predict the influences properly, the mode of their fluctuations should be understood.

JAEA Reports

None

Yoneda, Shigeo*; *

PNC TJ7308 96-002, 77 Pages, 1996/01

PNC-TJ7308-96-002.pdf:6.99MB

None

JAEA Reports

None

Yoneda, Shigeo*; *

PNC TJ7308 95-002, 80 Pages, 1995/03

PNC-TJ7308-95-002.pdf:8.59MB

no abstracts in English

JAEA Reports

None

Yoneda, Shigeo*

PNC TJ7308 95-001, 256 Pages, 1995/01

no abstracts in English

JAEA Reports

None

Yoneda, Shigeo*

PNC TJ7308 94-007, 81 Pages, 1994/03

PNC-TJ7308-94-007.pdf:10.04MB

no abstracts in English

JAEA Reports

The Study on transition of faulting area

Yoneda, Shigeo*; Ishikawa, Masanori*

PNC TJ7308 94-005, 82 Pages, 1994/03

PNC-TJ7308-94-005.pdf:6.02MB

no abstracts in English

JAEA Reports

None

; Yoneda, Shigeo*; Koyakaichi, Minoru*

PNC TJ7308 93-005, 292 Pages, 1993/03

PNC-TJ7308-93-005.pdf:6.95MB

no abstracts in English

JAEA Reports

None

Yoneda, Shigeo*

PNC TJ7308 93-003, 129 Pages, 1993/03

PNC-TJ7308-93-003.pdf:6.65MB

no abstracts in English

JAEA Reports

None

Yoneda, Shigeo*; Koyakaichi, Minoru*; Sakuramoto, Yuji*

PNC TJ7308 91-001VOL1, 119 Pages, 1991/03

PNC-TJ7308-91-001VOL1.pdf:3.08MB

no abstracts in English

Oral presentation

Magnetic and dielectric properties of electronic ferroelectric RFe $_{2}$ O $_{4}$ and related oxides (R: rare earths)

Yoshii, Kenji; Ikeda, Naoshi*; Okajima, Yuka; Yoneda, Yasuhiro; Matsuo, Yoji*; Horibe, Yoichi*; Mori, Shigeo*

no journal, ,

We have investigated the magnetic and dielectric properties of electronic ferroelectric oxides RFe $_{2}$ O $_{4}$ (R: rare earths) and their derivative materials. It was found that the magnetic transition temperature and the dielectric constant showed a possible relationship with electrical resistivity. In consideration of the mechanism of the ferroelectricity in RFe $_{2}$ O $_{4}$ , this result suggests that the magnetic and dielectric properties are likely rooted in the electron transfer at the Fe-site ions.