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《材料导报》期刊社  2018, Vol. 32 Issue (2): 272-277    https://doi.org/10.11896/j.issn.1005-023X.2018.02.023
  物理   材料研究 |材料 |
非完整形态KH2PO4晶体薄表面层生长特性
胡志涛,李明伟,尹华伟,肖林海
重庆大学动力工程学院,低品位能源利用技术及系统教育部重点实验室,重庆 400030
Growth Habit of Thin Surface Layer of KH2PO4 Crystal with Incomplete Crystallographic Shape
Zhitao HU,Mingwei LI,Huawei YIN,Linhai XIAO
Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400030
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摘要 

实时观察了非完整形态的KH2PO4(KDP)晶体在过饱和溶液中以薄表面层生长形式恢复其结晶学形态的过程。提出了晶体形态恢复的“最小多面体原理”,即:在自由生长系统中,对于非完整形态的KDP晶体,当其以薄表面层形式恢复其结晶学完整形态时,薄表面层将选择相应的奇异面方向生长,使晶体形态最终恢复为一个由各结晶学显露面所围成的体积最小的凸多面体。利用PBC理论分析了生长基元在非结晶学显露面上的附着情况并阐述了锥顶处薄表面层倒垂生长的原因。结果表明,薄表面层形成与晶体非完整结晶学形态及不均匀水动力学条件相关联。柱面凹角与非正常棱边及Z切片正常棱角均可诱发产生薄表面层,且薄表面层生长终止于其所在奇异面的正常结晶学晶棱。

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胡志涛
李明伟
尹华伟
肖林海
关键词:  薄表面层  晶体形态  KH2PO4晶体  生长习性    
Abstract: 

The regeneration process of KH2PO4 (KDP) crystal faces of incomplete crystallographic shape by means of the growth of thin surface layers in supersaturated solution was observed. “The smallest convex polyhedron principle” was put forward as a principle of crystallographic shape recovery. The principle refers to that when a KDP crystal of incomplete crystallographic shape recovers its crystallographic shape in a free crystal growth system by thin surface layer growing along the corresponding appearing faces, its geometric shape is approximate to a convex polyhedron of the smallest volume which is bounded by the appearing faces of the crystal. In addition, the attachment of growth unit to the positions of crystal disappearing face was investigated with the principle of PBC (periodic bond chain) theory which has been used for explain the formation of the new thin {101} layers generated from apexes. The results show that the thin surface layers, which are closely related to the incomplete crystallographic shape of crystal itself and the inhomogeneous hydrodynamic condition, will generate from both the concave corners and the abnormal edges of incomplete prismatic faces and the normal angles of Z-cut plates, and end at the normal crystallographic edges of the corresponding singular surface.

Key words:  thin surface layer    crystallographic shape    KH2PO4 crystal    growth habit
               出版日期:  2018-01-25      发布日期:  2018-01-25
ZTFLH:  O78  
基金资助: 国家自然科学基金(51476014)
引用本文:    
胡志涛,李明伟,尹华伟,肖林海. 非完整形态KH2PO4晶体薄表面层生长特性[J]. 《材料导报》期刊社, 2018, 32(2): 272-277.
Zhitao HU,Mingwei LI,Huawei YIN,Linhai XIAO. Growth Habit of Thin Surface Layer of KH2PO4 Crystal with Incomplete Crystallographic Shape. Materials Reports, 2018, 32(2): 272-277.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.023  或          http://www.mater-rep.com/CN/Y2018/V32/I2/272
图1  不同切割方式下的KDP晶体形态恢复图:(a)沿(001)面切割,(b)沿(110)面切割,(c)沿(201)面切割,(d)沿(102)面切割,(e)沿(111)面切割,(f)同时沿(001)面和(110)面切割
图2  三棱柱形Z切片籽晶的实时生长过程:(a)(001)面正常棱角处形成{101}面薄表面层,(b)两侧锥顶处形成新的{101}面薄表面层,(c)恢复柱面
图3  三棱柱形Z切片的结晶学形态恢复过程示意图:(a)下侧锥面的恢复,(b)上侧锥面的恢复,(c)柱面的恢复
图4  非完整柱面上的薄表面层生长:(a)含非正常棱边的柱面和(b)“L”形柱面
图5  (a)柱面凹角处构造单元附着过程与(b)薄表面层生长示意图
图6  (a)柱面凹角处与(b)非正常棱边上的薄表面层生长示意图(电子版为彩图)
图7  KDP晶体Z切片籽晶的成锥过程:(a)Z切片某一正常棱角处形成两{101}面薄表面层,(b)锥顶点处形成该晶锥另外两{101}面薄表面层(电子版为彩图)
图8  (a)(001)面棱角处构造单元的附着过程与(b)锥面薄表面层生长示意图(电子版为彩图)
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