学会発表/国際学会

2017年

1. S. Kojima, (Invited Talk)
The 28th Annual Workshop 2017 Fundamental Physics of Ferroelectrics Workshop, Colonial Williamsburg, USA, Feb. 1, 2017.
“Brillouin Scattering Spectroscopy on Crossover from Strong to Weak Relaxor Behaviors of Uniaxial Tungsten Bronze Ferroelectrics”

2. M. A. Helal, M. Aftabuzzaman, S. Tsukada, Šarūnas Svirskas, Maksim Ivanov, Jūras Banys, and S. Kojima, (Invited Talk)
The 28th Annual Workshop 2017 Fundamental Physics of Ferroelectrics Workshop, Colonial Williamsburg, USA, Feb. 1, 2017.
”Inelastic light scattering studies on relaxor ferroelectric 0.83Pb(Mg1/3Nb2/3)O3-0.17PbTiO3 single crystals”
（学振二国間共同研究事業の成果報告）

3. S. Kojima, M. A. Helal, M. Aftabuzzaman, S. Tsukada, Šarūnas Svirskas, and Jūras Banys, (Invited Talk)
The 14th Japan-Korea Joint Workshop on Advanced Materials, Busan, Korea, Feb. 19, 2017.
”Inelastic light scattering studies on relaxor ferroelectric 0.83Pb(Mg1/3Nb2/3)O3-0.17PbTiO3 crystals with perovskite structure”
（学振二国間共同研究事業の成果報告）

4. M. A. Helal, M. Aftabuzzaman, S. Kojima, S. Tsukada, and J. Banys
The 34th Meeting on Ferroelectrics and Their Applications, May 31, 2017, Kyoto
“Electric Field Effect of Inelastic Light Scattering of Relaxor Ferroelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 Crystals”
（学振二国間共同研究事業の成果報告）

5. M. Aftabuzzaman, M. A. Helal, J. Dec, W. Kleemann, and S. Kojima
The 34th Meeting on Ferroelectrics and Their Applications, May 31, 2017, Kyoto
“Electric Field and Aging Effects in Lead Free Uniaxial Ferroelectric Sr0.4Ba0.6Nb2O6 Single Crystals”

2016年

1. S. Kojima, (Invited Talk)
International Conference on Technologically Advanced Materials and Asian Meeting on Ferroelectricity (ICTAM-AMF10), Nov. 7-11 , 2016.
“Broadband Inelastic Light Scattering Study of Relaxor Ferroelectric Phase Transitions of K(Ta1-xNbx)O3 Crystals”

2. S. Kojima, (Invited Talk)
The 8th Japan-China Symposium on Ferroelectric Materials and Their Applications (JCFMA8)~ “Inelastic Light Scattering Study of Relaxor Ferroelectric Phase Transitions of K(Ta1-xNbx)O3 Crystals”

3. S. Kojima, (Invited Talk)
E-MRS, Symposium :Phase transitions and properties of ferroics, Warsaw, Poland, Sept. 20,2016
“Relaxor behavior of ferroelectric phase transitions in K(Ta1-xNbx)O3 crystal,”

4. S. Kojima, M. Aftabuzzaman, J. Dec, and W. Kleemann, (Invited Talk)
The fourth Lithuanian-Ukrainian-Polish meeting on physics of ferroelectric, Sept. 5, 2016, Palanga. Litjania,
“Brillouin Scattering Spectroscopy on Crossover from Strong to Weak Relaxor Ferroelectrics with Tungsten Bronze Structure ”

5. S. Kojima, Md. M. Rahaman, T. Imai, T. Sakamoto, and S. Tsukada, (Invited Talk)
13th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, June 19-23, Matsue,~ “Relaxor ferroelectric phase transitions of K(Ta1-xNbx)O3 crystals”

6. Š. Svirskas, M. Ivanov, Jūras Banys, Md Al Helal, T. Mori, S. Kojima,
13th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, June 19-23, Matsue,
“Broadband Dielectric Spectroscopy of 0.83Pb(Mg1/3Nb2/3)O3-0.17PbTiO3 Single Crystal”

7. S. Kojima, K. Kanehara, T. Hoshina, and T. Tsurumi,
The 33th Meeting on Ferroelectrics and Their Applications, May 25-28, 2016, Kyoto
“Optical phonons and polaritons of LiNbO3 studied by far-infrared spectroscopic ellipsometry and Raman scattering”

8. M. Aftabuzzaman, J. Dec, W. Kleemann, and S. Kojima
The 33th Meeting on Ferroelectrics and Their Applications, May 25-28, 2016, Kyoto
“Field Dependent Elastic Anomaly in Uniaxial Tungsten Bronze Relaxors”

9. S. Kojima, Y. Matsuda, S. Aramomi, M. Kofu, and O. Yamamuro,
The 13th International Conference on the Structure of Non-crystalline Materials, July 26-29, 2016, Halifax, Canada,
“Boson Peaks of Alkali Borate Glasses Studied by Inelastic Neutron and Light Scattering”

10. S. Kojima, M. M. Rahaman, T. Imai, T. Sakamoto, and S. Tsukada,
The 27th Annual Workshop 2016 Fundamental Physics of Ferroelectrics Workshop, Colonial Williamsburg, 米国、平成28年1月31日~　 "Relaxor like behavior of ferroelectric phase transitions in K(Ta1-xNbx)O3 crystals”

2015年

1. S. Kojima, (Invited Talk)
韓国物理学会年会、2015年 10月21日、慶州、~　 “Terahertz Vibrational Spectroscopy of Condensed Matter”

2. S. Kojima, K. Matsumoto, J. Dec, and W. Kleemann (Invited Talk)
The International Chemical Congress of Pacific Basin Societies 2015, PACIFICCHEM, Dec. 15-25, 2015, Hawaii Convention Center
“Nonequilibrium behavior of uniaxial relaxor ferroelectrics with tungsten bronze structure”

3. S. Kojima,
14th International Conference on The Physics of Non-Crystalline Solids, Sept. 20-25, 2015, Niagara Falls, NY, US
“Boson Peaks in Alkali and Alkaline Earth Metal Modified Borate Glasses”

4. S. Kojima, K. Matsumoto, J. Dec, and W. Kleemann,
13th European Meeting on Ferroelectricity (EMF-13),Porto, Portugal, Jun 28.~ Jul. 3, 2015
“Nonequilibrium behavior of uniaxial ferroelectric calcium strontium niobate”

5. S. Kojima, T. Mori, and M. Maczka,
13th European Meeting on Ferroelectricity (EMF-13), Porto, Portugal, Jun 28.~ Jul. 3, 2015
"Terahertz Time-Domain Spectroscopy of Raman Inactive Phonon-Polariton in Strontium Titanate”

6. T. Matsumoto and S. Kojima,
The 32th Meeting on Ferroelectrics and Their Applications, May 25-28, 2015, Kyoto
"Electric field effect of uniaxial relaxor ferroelectric SrxBa1-xNb2O6 ”

7. Md. M. Rahaman, S. Kojima, T. Imai, J. Miyazu, and J. Kobayashi,
The 32th Meeting on Ferroelectrics and Their Applications, May 25-28, 2015, Kyoto
"Effect of Li-doping on Polar Nanoregions in K(Ta1-xNbx)O3 Single Crystals”

8. M. A. Helal, T. Mori, and S. Kojima,
The 32th Meeting on Ferroelectrics and Their Applications, May 25-28, 2015, Kyoto
“Softening of Infrared Active Mode of Provskite BaZrO3 Proved by THz Time Domain Spectroscopy”

2014年

1. S. Kojima and T. Mori, (Invited Talk)
Symposium RCBJSF-2014-FMNT, Riga, Latvia, Sept. 29-Oct.2, 2014 "Broadband Terahertz Time-Domain Spectroscopy of Ferroelectric Crystals”

2. K. Matsumoto, K. Suzuki, S. Kojima, J. Dec, T. Łukasiewicz, and W. Kleemann,
The 31th Meeting on Ferroelectrics and Their Applications, May 25-28, 2014, Kyoto
"Origin of relaxor behaviors in uniaxial ferroelectric CaxBa1-xNb2O6 crystals with tungsten bronze structure”

3. M. M. Rahaman, T. Imai, J. Miyazu, J. Kobayashi, S. Kojima,
AMF-AMEC, Nov. , 2014, Shanghai, China,
"Micro-Brillouin scattering study on composition gradient KTa1-xNbxO3 crystals”

4. S. Kojima, K. Matsumoto, J. Dec, T. Łukasiewicz, and W. Kleemann, (Invited Talk)
Electrosceramics XIV, Jun. 16-20, Bucharest, Rumania,
"Brillouin Scattering Spectroscopy on Crossover from Strong to Weak Relaxor Nature of Uniaxial Tungsten Bronze Ferroelectric Crystals”

5. S. Kojima and T. Mori,
Electrosceramics XIV, Jun. 16-20, Bucharest, Rumania,
“Broadband Terahertz Time-Domain Spectroscopy of Oxygen Octahedra Ferroelectrics”

6. S. Kojima,~ (Invited Talak) The 18th International Symposium on Boron, Borites and Related Materials, Aug.31~Sept. 5, Hawaii, USA,
“Boson Peaks in Alkali and Alkaline Earth Metal Modified Borate Glasses”

2013年

1. S. Kojima, K. Nabeshima, K. Matsumoto, T.-H. Kim, J. Dec, T. Łukasiewicz, and W. Kleemann,
The 13th International Meeting on Ferroelectricity, Sept. 3-8, Kurakow, Poland,
“Crossover from Normal to Relaxor Ferroelectric Behavior of SBN26 and SBN 70 Studied by Inelastic Light Scattering”

2. M. Rahaman, T. Imai, J. Miyazu, J. Kobayashi,and S. Kojima,
The 13th International Meeting on Ferroelectricity, Sept. 3-8, Kurakow, Poland,
“Brillouin and Raman Scattering Studies of Phase Transitions of KTa1-xNbxO3 Single Crystals”

3. S. Kojima, Y. Matsuda, and H. Kawaji
The 12th International Conference of Structure of NOncrystalline Materials, Jul. 7-12, Trento, Italy,
“Excess Heat Capacity and Boson Peaks of Alkai Borate Glasses”

4. S. Aramomi, Y. Matsuda, and S. Kojima,
The 12th International Conference of Structure of NOncrystalline Materials, Jul. 7-12, Trento, Italy,
“High Temperature Brillouin Scattering Study on Elastic Properties of Lithium and Caesium Borate Glasses, Crystals and their Melts”

5. T. H. Kim, J.-H. Ko, and S. Kojima,
The 30th Meeting on Ferroelectrics and Their Applications, May 25-28, 2013, Kyoto
“Ferroelectric phase transition behaviors in Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3- PbTiO3 single crystals studied by Micro-Brillouin light scattering”

2012年

1. S. Kojima, S. Tsukada, A. Muhtar, Y. Bing, and Z. G. Ye
8th Asian Meeting on Ferroelectrics, Pattaya, Thailand, 9th - 14th Dec. 2012 “Relaxor Origin in Pb(Sc1/2Nb1/2)O3 Crystals Studied by Broadband Inelastic Light Scattering”

2. S. Kojima (Invited Talk),
ICWNCN Conference & Workshop 2012, March 15-20, Delhi, India
“Broadband Inelastic Light Scattering of Dynamic Polar Nanoregions in Relaxor Ferroelectrics”

3. S. Kojima, S. Tsukada, A. Muhtar, Y. Bing, and Z. G. Ye
20th International Symposium on the Applications of Ferroelectrics,10th European Conference on the Applications of Polar Dielectrics, Aveiro, 9th - 13th July 2012
“Diffuse Phase Transition of Pb(Sc1/2Nb1/2)O3 with Lead/Oxygen Vacancies Studied by Broadband Inelastic Light Scattering”

4. S. Kojima
XXIst International Symposium on the Jahn-Teller Effect, Tsukuba, 26-31, Aug. 2012 “Dynamic Polar Nanoregions and Broken Local Symmetry in Relaxor Ferroelectrics Studied by Inelastic Light Scattering”

5. T. Ariizumi, J. Zushi, R. Ohta, S. Kojima, Y. Noguchi, and M. Miyayama,
The 29th Meeting on Ferroelectrics and Their Applications, May 25-28, 2012, Kyoto
“Successive Phase Transition of Ferroelectric (K0.5Na0.5)NbO3 Crystals Studied by Inelastic Light Scattering”

2011年

1. S. Kojima, M. Ahart, V. Sivasubramanian, S. Tsukada, A.A. Bokov, and Z.-G. Ye, (Invited Talk)
Workshop on Structure-Property Relations in Relaxor Ferroelectrics, Xian, China, Nov. 1013, 2011
“Broadband Inelastic Light Scattering of Pb(B’1/2B”1/2)O3 Based Relaxor Ferroelectrics”

2. J. Zushi, T. Ariiumi, R. Ohta, S. Tsukada, Y. Akishige, and S. Kojima
“Inelastic Light Scattering of Lead Free Ferroelectric Sr2(Nb1-xTax)2O7 Crystals at High temperatures”
The 28th Meeting on Ferroelectrics and Their Applications, May 25-28, 2011, Kyoto

3. S. Kojima (Invited Talk)
The 20th IEEE International Symposium on Applications of Ferroelectrics, July 24-27, 2011, Vancouver, Canada
“Micro-Brillouin Scattering Study of Lead Free Ferroelectrics”

4. M. Kodama and S. Kojima,
The 7th International Conferences on Borate Glasses, Crystals, and Melts,Halifax, Canada, Aug. 21-25, 2011
"Velocity of Sound in and Elastic Properties of Alkali Borate Glasses”

5. R. Ohta, J. Zushi, T. Ariizumi, and Seiji Kojima,
EMF 2011 European Meeting on Ferroelectricity, Bordeaux, France, June 26 - July 2, 2011
“Precursor Dynamics of KTN Studied by Broadband Brillouin Scattering”

2011年

1. J. Zushi, T. Ariiumi, R. Ohta, S. Tsukada, Y. Akishige, and S. Kojima
“Inelastic Light Scattering of Lead Free Ferroelectric Sr2(Nb1-xTax)2O7 Crystals at High temperatures”
The 28th Meeting on Ferroelectrics and Their Applications, May 25-28, 2011, Kyoto

2. S. Kojima (Invited Talk)
“Micro-Brillouin Scattering Study of Lead Free Ferroelectrics”
The 20th IEEE International Symposium on Applications of Ferroelectrics, July 24-27, 2011, Vancouver, Canada

2010年

1. S. Kojima, H. Kanazawa, and T. Ishii
“Micro-Brillouin Scattering Study of Polymorphic Protein Crystals”
13th International Conference on Phonon Scattering in Condensed Matter, April 18-23, 2010, Taipei

2. S. Kojima , Y. Matsuda, H. Kawaji and T. Atake~ “Boson Peaks and Excess Heat Capacity of Lithium Borate Glasses”
13th International Conference on Phonon Scattering in Condensed Matter, April 18-23, 2010, Taipei

3. S. Kojima, Y. Matsuda, M. Kawashima, S. Aramomi, and M. Kodama
“Universality of Boson Peaks in Lithium Borate Glasses”~ 2010 Glass & Optical Materials Division Spring Meeting, May 16-20, 2010, NY. Corning

4. S. Kojima (Plenary Talk)
“Micro-Brillouin Scattering of Normal and Relaxor Ferroelectrics”
The 10th Russia/CIS/BAltic/Japan Symposium on Ferroelectricity, June 20-24, 2010, Yokohama

5. T. Ishii, S. Tsukada and S. Kojima
“Elastic Anomaly of Improper Ferroelectric Phase Transition of -Gadolinium Molybdate Investigated by Broadband Brillouin Scattering”
The 10th Russia/CIS/BAltic/Japan Symposium on Ferroelectricity, June 20-24, 2010, Yokohama

6. S.G. Lushnikov, A.I. Fedoseev, S.N. Gvasaliya, S. Kojima
“Anomalous behavior of the acoustic phonon velocity, damping and elastic constants of cubic relaxor ferroelectrics”
The 10th Russia/CIS/BAltic/Japan Symposium on Ferroelectricity, June 20-24, 2010, Yokohama

7. A.V. Svanidze, S.G. Lushnikov, I.P. Koludarov, S. Kojima
Brillouin light scattering study of lysozyme denaturation by guanidine hydrochloride
The 10th Russia/CIS/BAltic/Japan Symposium on Ferroelectricity”, June 20-24, 2010, Yokohama

8. F. Shikanai, K. Tomiyasu, N. Aso, S. Itoh, S. Ikeda, T. Kamiyama, S. Tsukada, J. Kano, and S. Kojima
“Dynamical Properties on the Protonic Conductor K3H(SeO4)2”
The 10th Russia/CIS/BAltic/Japan Symposium on Ferroelectricity, June 20-24, 2010, Yokohama

9. D. H. Kim, S. Kojima and J. –H. Ko
“A Micro-Brillouin Scattering Study on Pb[(Zn1/3Nb2/3)xTi1-x]O3 Single Crystal with x=0.07”
The Joint conference of 7th Asian Meeting on Ferroelectricity and 7th Asian Meeting on ElectroCeramics, June 28-July 1, Jeju, Korea

10. S. Kojima, S. Tsukada, Y. Hidaka, A. A. Bokov, and Z. G. Ye (Invited Talk)
“Strain Relaxation at Nanometer Scale in Relaxor Ferroelectric Pb(Sc1/2Nb1/2)O3-PbTiO3 Probed by Broadband Brillouin Scattering”
The Joint conference of 7th Asian Meeting on Ferroelectricity and 7th Asian Meeting on ElectroCeramics, June 28-July 1, Jeju, Korea~

11. J. –H. Ko, D. H. Kim, S. Kojima, A. A. Bokov, and Z. –G. Ye
“A Micro-Brillouin Scattering Study on Pb[(Mg1/3Nb2/3)xTi1-x]O3 Single Crystals with 0 ≤ x ≤ 0.55”
The Joint conference of 7th Asian Meeting on Ferroelectricity and 7th Asian Meeting on ElectroCeramics, June 28-July 1, Jeju, Korea

12.T. H. Kim, J. –H. Ko, S. B. Kim, K. –B. Park, and S. Kojima
Growth of Ba1-xCaxTiO3 Single Crystals with 0.12 ≤ x ≤ 0.33 and Their “Ferroelectric Phase Transitions Studied by Dielectric and Light Scattering Spectroscopies”
The Joint conference of 7th Asian Meeting on Ferroelectricity and 7th Asian Meeting on ElectroCeramics, June 28-July 1, Jeju, Korea

13. T. Ishii, H. Kanazawa, and S. Kojima
“Micro-Brillouin Scattering Study of Orthorhombic HEWL scyrtals in Glycerol”
The 30th European Congress on Molecular Spectroscopy, Aug. 28-Sept. 3, 2010, Florence, Italy

14. M. Kawashima, S. Aramomi, Y. Matsuda, S. Kojima
“Temperature dependence of elastic properties in alkali borate binary glasses”
The 30th European Congress on Molecular Spectroscopy, Aug. 28-Sept. 3, 2010, Florence, Italy

15. S. Kojima (Invited Talk)
“Micro-Brillouin Scattering Spectroscopy for Crystalline and Non-Crystalline Materials”
The 3rd International Symposium on Innovations in Advanced Materials for Optics & Electronics, October 17-20, 2010, Toyama, Japan

2009年

1. S. Kojima (Plenary Talk)
“Gigahertz Acoustic Spectroscopy by Micro-Brillouin Scattering”
The 30 th Symposium on Ultrasonic Electronics, Nov. 18-20, 2009, Kyoto

2. S. Kojima, Y. Matsuda, Y. Fukawa, M. Kawashima, Y. Moriya, T. Yamada, O. Yamamuro, M. Kodama, (Invited Talk)
The XII th Physics of Non-crystalline Solids and Crystallization, Sept. 7-10, 2009, Iguasu, Brazil
“Boson Peaks of Lithium Borate Glasses Studied by Inelastic Neutron and Light Scattering”

3. S. Kojima (Plenary Tutorial Lecture)
“Raman Scattering Spectroscopy of Ferroelectric Materials”
The 26th Meeting on Ferroelectrics and Their Applications, May 27-30, 2009, Kyoto