Study on relation between framework structure and negative thermal expansion property

2008 Fiscal Year Final Research Report

• Project/Area Number: 19560672
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: University of Tsukuba
• Principal Investigator: YAMAMURA Yasuhisa University of Tsukuba, 大学院・数理物質科学研究科, 講師 (80303337)
• Project Period (FY): 2007 – 2008
• Keywords: 負の熱膨張 / フォノン / 熱物性 / フレームワーク構造 / 熱収縮

Research Abstract

温度上昇に伴い熱収縮する"負の熱膨張"を示す物質に共通する特徴を見出すために, 様々な負の熱膨張物質の原子の協同的な振動に由来する格子振動を検討した, その結果, 負の熱膨張物質に共通する三つの格子振動の特徴を明らかにすることに成功した. その三つの格子振動の特徴は, 物質の化学的・結晶構造的特徴と密接に関係することが明らかとなった. この研究成果により, 新しい負の熱膨張物質を創造する基礎を与えることができた.

Research Products

• [Journal Article] Characteristic phonon spectrum of negative thermal expansion materials with framework structure through calorimetric study of Sc_2M_3O_<12> (M = W and Mo) (2009)
  • Author(s): Yasuhisa Yamamura, Satoaki Ikeuchi,and Kazuya Saito
  • Journal Title: Chemistry of Materials (印刷中)
  • Peer Reviewed
• [Journal Article] 負の熱膨張物質の熱力学的特性と相転移現象 (2008)
  • Author(s): 山村泰久
  • Journal Title: Netsu Sokutei 35 Pages: 2-9
  • Peer Reviewed
• [Journal Article] Possible Phonon Density of States of High-Temperature Phase Structure of the Negative Thermal Expansion Compound ZrW_2O_8 (2007)
  • Author(s): Yasuhisa Yamamura,and Kazuya Saito
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 123603-1-123603-4
  • Peer Reviewed
• [Journal Article] Comprehensive Interpretation of Substitution Effect on an Order-Disorder Phase Transition in A_<1-x>M_xW_2O_<8-y>(A = Zr, Hf ; M = Trivalent Cations) and Other ZrW_2O_8-Based Solid Solutions (2007)
  • Author(s): Yasuhisa Yamamura, Kenichi Masago, Masayuki Kato,and Toshihide Tsuji
  • Journal Title: The Journal Physical Chemistry B 111 Pages: 10118-101221
  • Peer Reviewed
• [Presentation] 負の熱膨張物質の設計についての熱力学的アプローチ (2008)
  • Author(s): 山村泰久, 池内賢朗, 齋藤一弥
  • Organizer: 第44回熱測定討論会
  • Place of Presentation: つくば
  • Year and Date: 2008-10-16
• [Presentation] Phonon Property of High Temperature Phase Structure of Negative Thermal Expansion Materials ZrW_2O_8 (2008)
  • Author(s): Yasuhisa Yamamura, Kazuya Saito
  • Organizer: 62nd Calorimetry Conference (CALCON2007)
  • Place of Presentation: Hawaii USA
  • Year and Date: 2008-08-07
• [Presentation] Calorimetric Study of Negative Thermal Expansion Oxides (2008)
  • Author(s): Yasuhisa Yamamura
  • Organizer: The 63^<rd> Calorimetry Conference (CALCON2008)
  • Place of Presentation: Jersey City, New Jersey, USA
  • Year and Date: 2008-07-05
• [Presentation] フレームワーク構造を有する負の熱膨張物質における特徴的なフォノン状態密度分布 (2008)
  • Author(s): 山村泰久, 池内賢朗, 齋藤一弥
  • Organizer: 日本セラミックス協会2008年年会
  • Place of Presentation: 長岡
  • Year and Date: 2008-03-21
• [Presentation] 負の熱膨張物質の熱力学特性と相転移現象 (2007)
  • Author(s): 山村泰久
  • Organizer: 第43回熱測定討論会
  • Place of Presentation: 札幌
  • Year and Date: 2007-10-03