Browsing NTNU Open by Author "Ohara, Koji"

Now showing items 1-7 of 7

    • Controlled growth of SrxBa1-xNb2O6 hopper- and cube-shaped nanostructures by hydrothermal synthesis 

      Grendal, Ola Gjønnes; Nylund, Inger-Emma; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2020)
      Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material SrxBa1-xNb2O6 (x = 0.32–0.82, SBN) was prepared ...

    • Controlled Growth of SrxBa1−xNb2O6 Hopper‐ and Cube‐Shaped Nanostructures by Hydrothermal Synthesis 

      Grendal, Ola Gjønnes; Nylund, Inger-Emma; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)
      Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material SrxBa1−xNb2O6 (x=0.32–0.82, SBN) was prepared ...

    • In situ X-ray diffraction studies of the crystallization of K0. 5Na0. 5NbO3 powders and thin films from an aqueous synthesis route 

      Bakken, Kristine; Gaukås, Nikolai Helth; Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Chernyshov, Dmitry; Glaum, Julia; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)
      Aqueous chemical solution deposition is a promising route for ferroelectric K0.5Na0.5NbO3 (KNN) thin films, requiring a stable precursor solution with complexed Nb5+. Here, we report on the local structure of Nb-complexes ...

    • Structure and properties of densified silica glass: characterizing the order within disorder 

      Akola, Jaakko; Onodera, Yohei; Kohara, Shinji; Salmon, Philip S.; Hirata, Akihiko; Nishiyama, Norimasa; Kitani, Suguru; Zeidler, Anita; Shiga, Motoki; Masuno, Atsunobu; Inoue, Hiroyuki; Tahara, Shuta; Polidori, Analisa; Fischer, Henry E.; Mori, Tatsuya; Mori, Seiji; Kawaji, Hitoshi; Kolesnikov, Alexander I.; Stone, Matthew B.; Tucker, Matthew G.; McDonnell, Marshall T.; Hannon, Alex C.; Hiraoka, Yasuaki; Obayashi, Ippei; Nakamura, Takenobu; Fujii, Yasuhiro; Ohara, Koji; Taniguchi, Takashi; Sakata, Osami (Peer reviewed; Journal article, 2020)
      The broken symmetry in the atomic-scale ordering of glassy versus crystalline solids leads to a daunting challenge to provide suitable metrics for describing the order within disorder, especially on length scales beyond ...

    • Structures and Role of the Intermediate Phases on the Crystallization of BaTiO3 from an Aqueous Synthesis Route 

      Bakken, Kristine; Pedersen, Viviann Hole; Blichfeld, Anders Bank; Nylund, Inger-Emma; Tominaka, Satoshi; Ohara, Koji; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)
      Carbonate formation is a prevailing challenge in synthesis of BaTiO3, especially through wet chemical synthesis routes. In this work, we report the phase evolution during thermal annealing of an aqueous BaTiO3 precursor ...

    • Understanding the Hydrothermal Formation of NaNbO3: Its Full Reaction Scheme and Kinetics 

      Skjærvø, Susanne Linn; Ong, Gary K.; Grendal, Ola Gjønnes; Wells, Kristin Høydalsvik; Van Beek, Wouter; Ohara, Koji; Milliron, Delia J.; Tominaka, Satoshi; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)
      Sodium niobate (NaNbO3) attracts attention for its great potential in a variety of applications, for instance, due to its unique optical properties. Still, optimization of its synthetic procedures is hard due to the lack ...

    • Very sharp diffraction peak in nonglass-forming liquid with the formation of distorted tetraclusters 

      Koyama, Chihiro; Tahara, Shuta; Kohara, Shinji; Onodera, Yohei; Småbråten, Didrik Rene; Selbach, Sverre Magnus; Akola, Jaakko; Ishikawa, Takehiko; Masuno, Atsunobu; Mizuno, Akitoshi; Okada, Junpei T.; Watanabe, Yuki; Nakata, Yui; Ohara, Koji; Tamaru, Haruka; Oda, Hirohisa; Obayashi, Ippei; Hiraoka, Yasuyuki; Sakata, Osami (Peer reviewed; Journal article, 2020)
      Understanding the liquid structure provides information that is crucial to uncovering the nature of the glass-liquid transition. We apply an aerodynamic levitation technique and high-energy X-rays to liquid (l)-Er2O3 to ...