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Journal Articles

Crystal and magnetic structures and properties of BiMnO$$_{3+delta}$$

Belik, A. A.*; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Kosuda, Kosuke*; Muromachi, Eiji*

Journal of the American Chemical Society, 132(23), p.8137 - 8144, 2010/05

https://doi.org/10.1021/ja102014n
 Times Cited Count：49 Percentile：74.59(Chemistry, Multidisciplinary)

Journal Articles

Local crystal structure of multiferroic system BiMnO$$_3$$ by atomic pair distribution function analysis

Kodama, Katsuaki; Iikubo, Satoshi; Shamoto, Shinichi; Belik, A. A.*; Muromachi, Eiji*

Journal of the Physical Society of Japan, 76(12), p.124605_1 - 124605_7, 2007/12

https://doi.org/10.1143/JPSJ.76.124605
 Times Cited Count：23 Percentile：71.06(Physics, Multidisciplinary)

Journal Articles

Origin of the monoclinic-to-monoclinic phase transition and evidence for the centrosymmetric crystal structure of BiMnO$$_3$$

Belik, A. A.*; Iikubo, Satoshi; Yokosawa, Tadahiro*; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Azuma, Masaki*; Takano, Mikio*; Kimoto, Koji*; Matsui, Yoshio*; et al.

Journal of the American Chemical Society, 129(4), p.971 - 977, 2007/01

https://doi.org/10.1021/ja0664032
 Times Cited Count：182 Percentile：95.3(Chemistry, Multidisciplinary)

Structural properties of polycrystalline single-phased BiMnO$$_3$$ samples prepared at 6 GPa and 1383 K have been studied by selected area electron diffraction (SAED), convergent beam electron diffraction (CBED), and the Rietveld method using neutron diffraction data measured at 300 and 550 K. The SAED and CBED data showed that BiMnO$$_3$$ crystallizes in the centrosymmetric space group C2/c at 300 K. The analysis of Mn-O bond lengths suggested that the orbital order present in BiMnO$$_3$$ at 300 K melts above T= 474 K. The phase transition at 474 K is of the first order and accompanied by a jump of magnetization and small changes of the effective magnetic moment and Weiss temperature.

Journal Articles

Neutron powder diffraction study on the crystal and magnetic structures of BiCoO$$_3$$

Belik, A. A.*; Iikubo, Satoshi; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Niitaka, Seiji*; Azuma, Masaki*; Shimakawa, Yuichi*; Takano, Mikio*; Izumi, Fujio*; et al.

Chemistry of Materials, 18(3), p.798 - 803, 2006/02

https://doi.org/10.1021/cm052334z
 Times Cited Count：278 Percentile：98.63(Chemistry, Physical)

The crystal and magnetic structures of polycrystalline BiCoO$$_3$$ have been determined by the Rietveldmethod from neutron diffraction data measured at temperatures from 5 to 520 K. BiCoO$$_3$$ (space groupP4mm; Z=1; a=3.72937(7) ${AA}$ and c=4.72382(15) ${AA}$ at room temperature; tetragonality c/a=1.267) is isotypic with BaTiO$$_3$$ and PbTiO$$_3$$ in the whole temperature range. BiCoO$$_3$$ is an insulator with a Neeltemperature of 470 K. A possible model for antiferromagnetic order is proposed with a propagationvector of k=(1/2, 1/2, 0). In this model, magnetic moments of Co$$^{3+}$$ ions are parallel to the c directionand align antiferromagnetically in the ab plane. The antiferromagnetic ab layers stack ferromagneticallyalong the c axis, forming a C-type antiferromagnetic structure. Refined magnetic moments at 5 and 300K are 3.24(2)$$mu$$$$_B$$ and 2.93(2)$$mu$$$$_B$$, respectively. The structure refinements revealed no deviation fromstoichiometry in BiCoO$$_3$$. BiCoO$$_3$$ decomposed in air above 720 K to give Co$$_3$$O$$_4$$ and sillenite-like Bi$$_{25}$$CoO$$_{39}$$.

Journal Articles

BiScO$$_3$$: Centrosymmetric BiMnO$$_3$$-type oxide

Belik, A. A.*; Iikubo, Satoshi; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Maie, Makoto*; Nagai, Takuro*; Matsui, Yoshio*; Stefanovich, S. Y.*; Lazoryak, B. I.*; et al.

Journal of the American Chemical Society, 128(3), p.706 - 707, 2006/01

https://doi.org/10.1021/ja057574u
 Times Cited Count：114 Percentile：89.99(Chemistry, Multidisciplinary)

The crystal structure of BiScO$$_3$$ have been determined by neutron diffraction and electron diffraction measurements. All experimental results shows space group of BiScO$$_3$$ is C2/c, which has a center of symmetry.

Journal Articles

Magnetic excitations from the linear Heisenberg antiferromagnetic spin trimer system A$$_3$$Cu$$_3$$(PO$$_4$$)$$_4$$ (A=Ca, Sr, and Pb)

Matsuda, Masaaki; Kakurai, Kazuhisa; Belik, A. A.*; Azuma, Masaki*; Takano, Mikio*; Fujita, Masaki*

Physical Review B, 71(14), p.144411_1 - 144411_5, 2005/04

https://doi.org/10.1103/PhysRevB.71.144411
 Times Cited Count：33 Percentile：75.01(Materials Science, Multidisciplinary)

Inelastic neutron scattering experiments were performed on A$$_3$$Cu$$_3$$(PO$$_4$$)$$_4$$ (A=Ca, Sr, and Pb), which consists of one-dimensional array of linear copper spin trimers. It was found that the magnetic excitations are well described by the linear Heisenberg antiferromagnetic spin trimer model without adjustable parameters except the overall scale factor. The intra-trimer coupling contants are determined to be 9.39(4), 9.99(4), and 9.07(4) meV for A$$_3$$Cu$$_3$$(PO$$_4$$)$$_4$$ with A=Ca, Sr, and Pb, respectively.

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