1997 Fiscal Year Final Research Report Summary
Pressure dependence of crystal growth mechanism
| Project/Area Number |
04680052
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
結晶学
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| Research Institution | University of Tsukuba |
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Principal Investigator |
TAKANO K.J. University of Tsukuba, Institute of materials Science, Associtate Prof, 物質工学系, 助教授 (60133005)
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| Co-Investigator(Kenkyū-buntansha) |
WAKATSUKI M. University of Tsukuba, Institute of materials Science, Prof., 物質工学系, 教授 (50114153)
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| Project Period (FY) |
1992 – 1993
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| Keywords | crystal Growth / high Pressure / interfacial tension / paraxylene |
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| Research Abstract |
The pressure, temperature, and concentration dependence of nucleation was observed with the p-and m-xylene binary system using an optical liquid high pressure cell. The deduced interfacial tension increased with increasing pressure and with decreasing p-xylene content. The interfacial tension decreased with increasing temperature.
The new instrument detecting the volume of sample at high pressure was developed. With the instrument, the equations of state of p-xylene both in liquid and solid state were measured partially. The pressure and temperature dependence of the energy change of dissolution was deduced with the volume change of the liquid to solid phase transition and the other thermodynamical quantities measured in this study.
The mechanism giving the pressure dependence to the interfacial tension was examined with the above mentioned thermodynamical quantities, which gives the following figure. The pressure dependence arises from both the increase of breaking bond energy by compression and the decrease of the interfacial excess entropy by compression.
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