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The temperature at which lattices begin to be appreciably mobile is sometimes termed the Tammann Temperature; and that at which surface atoms become significantly mobile, the H¨¹ttig temperature. For simple compounds without phase changes on heating and of low vapor pressure, the Tammann temperature is very approximately 0.5 Tm and the H¨¹ttig temperature about 0.3 Tm , where Tm is the melting point in absolute units. Appreciable mobility appears at about Tm/3 for metals[1]. ÉÕ½áÊÇÔÚÔ¶µÍÓÚ¹Ì̬ÎïÖʵÄÈÛÈÚζÈϽøÐеģ¬Ò»ÖÖÎïÖÊ¿ªÊ¼³ÊÏÖÏÔÖøÀ©É¢×÷ÓõÄζȣ¬´Ë³ÆÎªÌ©ÂüζȻòÉÕ½áζȡ£Ì©Âü(Tammann)·¢ÏÖÉÕ½áζÈ(TS)ºÍÈÛÈÚζÈ(Tm)µÄ¹ØÏµÓÐÒ»¶¨µÄ¹æÂÉ[2]£º ½ðÊô TS ¡Ö £¨0.3~0.4£©Tm ÑÎÀà TS ¡Ö 0.57 Tm ¹èËáÑÎ TS ¡Ö £¨0.8~0.9£©Tm ÉÕ½áºÍÈÛÈÚÕâÁ½¸ö¹ý³Ì¶¼ÊÇÓÉÔ×ÓÈÈÕñ¶¯¶øÒýÆðµÄ£¬µ«ÈÛÈÚʱȫ²¿×éÔª¶¼×ª±äΪҺÏ࣬¶øÉÕ½áʱÖÁÉÙÓÐÒ»×éÔªÊÇ´¦ÓÚ¹Ì̬¡£ References: 1. Charles N. Satterfield. Heterogeneous Catalysis in Industrial Practice(2nd Edition). McGraw-Hill, Inc. 1991. 2. Ò¶ÈðÂ×£¬·½ÓÀººµÈ. ÎÞ»ú²ÄÁÏÎïÀí»¯Ñ§. Öйú½¨Öþ¹¤Òµ³ö°æÉç. 1986 |
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linkinghub.elsevier.com/retrieve/pii/001623619090127C - ÀàËÆÍøÒ³ ÔÚgoogleÉÏ¿´µ½ÊÇ405¶È£¬Tammann temperature of Cu (405C£© Fuel Volume 69, Issue 11, November 1990, Pages 1440-1447£¬Ì«ÔçÁË£¬ÎÞ·¨ÏÂÔØÈ«ÎÄ£¡ |
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