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paul139168: ½ð±Ò+15 2015-10-27 22:35:19
It is polymorph II that only in pressure 18MPa the compond presents, however, in all the other conditions the product is polymorph I, so the pressure determines the result of the preparation of crystal.

Ö»ÓÐÔÚ18MPa ʱ»¯ºÏÎï¿É³ÊÏÖII¾§Ð͵Ľṹ£¬ÆäËûÌõ¼þϵIJúÎï¾ùΪI¾§ÐÍ£¬Òò´Ë£¬Ñ¹Á¦¾ö¶¨ÁËÖÆ±¸¾§ÌåËùµÃµÄ½á¹û¡£
2Â¥2015-10-20 23:54:27
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paul139168: ½ð±Ò+15 2015-10-27 22:35:15
ÔÚÕâ¸ö¹ý³ÌÖУ¬Ñ¹Á¦Æðµ½¾ö¶¨ÐÔ×÷Óã¬Ö»Óе±Ñ¹Á¦Îª18MPaʱ²ÅÄܲúÉú¾§ÐÍ2£¬ÔÚÆäËûѹÁ¦Ìõ¼þÏ£¬¶¼Ö»»á³öÏÖ¾§ÐÍ1¡£

It is the pressure that is crucial to the progress as only 18MPa produced ¾§ÐÍ2£¬while all other pressures produced ¾§ÐÍ1.  (רҵÃû´Ê¾§ÐÎÄã×Ô¼ºÈ·¶¨£»Ö÷¾äÓÃÒ»°ãÏÖÔÚʱÒòËü˵µÄÊÇÕæÀí£¬as´Ó¾äÓùýȥʱÒòËü˵µÄÊÇʵÑéÖгöÏÖµÄÇé¿ö¡££©
3Â¥2015-10-21 12:58:50
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mac194

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paul139168: ½ð±Ò+5 2015-10-27 22:35:01
д×÷¼¼ÇÉ:
-1- ³ý·Ç½ô¸úÖ÷Ìâ, ÉÙÓà "it, him..." Ò»Àà´úÃû´Ê
-2- ¶ÁÕßϰ¹ß×¢Òâ¾äÍ·ºÍ¾äβ, ËùÒÔ¿É·Å 18 MPa ÔÚ¾äβǿµ÷

Whether the process yields ¾§ÐÍ2 or the more common __¾§ÐÍ1 depends first and foremost on pressure: __¾§ÐÍ2 only forms when pressure is at or near 18 MPa

___ = ÐÎÈÝ´Ê,¿´Í¼2 (¼ÇµÃ¼Ó bcc / fcc /...); Èç¹û´óµ½¿ÉÔÚÏÔ΢¾µÏ¿´µ½Î¢×éÖ¯ (microstructure), Ôò¿¼ÂÇÓÃͼ3

΢×éÖ¯Ò»°ãËæÏà (¦Á,¦Â,¦Ã.. ) ¶ø±ä, Èç¹û²»´æÔÚêdzÆ, ¿ÉÓà spherulitic, lamellar... µÈ×ÖÐÎÈÝ
   ------
[ͼ 1]  https://www.citycollegiate.com/solid2.htm

[ͼ 2]  https://en.wikipedia.org/wiki/Trigonal_crystal_system

[ͼ 3]  https://amrel.bioe.uic.edu/NSFRE ... %20REport.rough.pdf
   ------
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4Â¥2015-10-21 22:08:30
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paul139168: ½ð±Ò+15, ·­ÒëEPI+1 2015-10-27 22:34:53
ÔÚÕâ¸ö¹ý³ÌÖУ¬Ñ¹Á¦Æðµ½¾ö¶¨ÐÔ×÷Óã¬Ö»Óе±Ñ¹Á¦Îª18MPaʱ²ÅÄܲúÉú¾§ÐÍ2£¬ÔÚÆäËûѹÁ¦Ìõ¼þÏ£¬¶¼Ö»»á³öÏÖ¾§ÐÍ1¡£

Pressure is the most critical factor that determines the outcome of the reaction (or process), type 2 crystals are formed only when it reaches 18MPa, while under all other (pressure) conditions types 1 crystals are formed.
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5Â¥2015-10-24 08:51:35
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