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Habit Change and Growth Mechanism of NaBrO_3 and NaClO_3

Research Project

Project/Area Number 08640612
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionUniversity of Tokushima

Principal Investigator

INOUE Tetsuo  Univ.of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (60005923)

Co-Investigator(Kenkyū-buntansha) NISHOKA Kazumi  Univ.of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (90035650)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1998: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
KeywordsSodium bromate / crystal habit / aqueous solution / in-situ observation / NaBrO_3 / NaBrO_3結晶
Research Abstract

The effects of impurities, (1)acetic acid, 1.15 mol% and (2) sodium acetate (anhydrous), 1.0 mol%, upon the habit changes of NaBrO_3 crystals have been investigated. The crystals were grown from aqueous solution under the following conditions ; (i) supersaturations : ln(C/Ce)=0 - 0.4, (Ce : equilibrium mole fraction), (ii)growth temperatures : 20-64゚C.The results of habit changes were shown in a plot of growth temperature against supersaturation (such a plot is called a morphodrome). It was found that the impurity effects on the habit changes were more important in the low supersaturation range than in the high supersaturation range. The process of crystal growth was observed in-situ under an optical microscope. A heating stage was set on the microscope stage. The heating stage was composed of the heating and cooling unit using Peltier element. The results were summarized as follows.
(1) (1) The domain of {100} (cubic habit) is located at the higher temperature region as compared to {111}(tetrahedral habit) for wide range of supersaturations for both pure and doped solutions.
(2) The acetic acid doping raised the transition temperature for the change from {111} (tetrahedral habit) to {100} (cubic habit), but the sodium acetate doping decreased the temperature in comparison with the pure case for the low supersaturation range.
(3) The transition temperature from {111} (tetrahedral habit) to {100}(cubic habit) decreased with increasing of supersaturation in all cases.
(4) The domain of intermediate shape in the case of sodium acetate doping was larger than the other cases.
(5) It was considered that the doping of acetic acid decreased the growth rates of {111}, whereas the doping of sodium acetate decreased the growth rates of {100}.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 井上哲夫: "NaBrO_3の晶相変化におよぼす不純物効果" 日本結晶成長学会誌. 23(3). 191 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 井上哲夫: "水溶液から成長するNaBrO_3の晶相変化" 形の科学会報. 11(3). 6-7 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 井上哲夫: "NaBrO_3の晶相変化(その3)" 日本結晶成長学会誌. 24(2). 167 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 井上哲夫: "NaBrO_3の晶相変化(その4)" 日本結晶成長学会誌. 25(3). A149 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tetsuo Inoue, Kazumi Nishioka: "Effects of impurities upon the habit changes of NaBrO_3" J.Japan.Assoc.for Crystal Gowth. 23 (3). 191 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tetsuo Inoue, Kazumi Nishioka: "Habit changes of NaBrO_3 cryatals grown from aqueous solution" Circular of The Society for Science on Form, Japan. 11 (3). 6 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tetsuo Inoue, Kazumi Nishioka: "Habit changes of NaBrO_3 crystals (No.3)" J.Japan.Assoc.for Crystal Gowth. 24 (2). 167 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tetsuo Inoue, Kazumi Nishioka: "Habit changes of NaBrO_3 crystals (No.4)" J.Japan.Assoc.for Crystal Gowth. 25 (3). 149 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 井上哲夫: "NaBrO_3の晶相変化におよぼす不純物効果" 日本結晶成長学会誌. 23(3). 191 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] 井上哲夫: "水溶液から成長するNaBrO_3の晶相変化" 形の科学会報. 11(3). 6-7 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] 井上哲夫: "NaBrO_3の晶相変化(その3)" 日本結晶成長学会誌. 24(2). 167 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 井上哲夫: "NaBrO_3の晶相変化(その4)" 日本結晶成長学会誌. 25(3). A149 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Yamaguchi, T.Inoue, K.Nishioka: "Growth and perfection of KCI crystals grown from aqueous solution" Journal of Crystal Growth. (to be published,in printing).

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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