非完整形态KH<sub>2</sub>PO<sub>4</sub>晶体薄表面层生长特性

doi:10.11896/j.issn.1005-023X.2018.02.023

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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

Published: 25 January 2018 Online: 2018-01-25

CLC number:

O78

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	Articles by authors
	Zhitao HU
	Mingwei LI
	Huawei YIN
	Linhai XIAO

Cite this article:

Zhitao HU,Mingwei LI,Huawei YIN, et al. Growth Habit of Thin Surface Layer of KH₂PO₄ Crystal with Incomplete Crystallographic Shape[J]. Materials Reports, 2018, 32(2): 272-277.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.02.023 OR https://www.mater-rep.com/EN/Y2018/V32/I2/272

Photos of KDP crystal regenerated from different incomplete crystallographic shape on (a) (001) cut, (b) (110) cut, (c) (201) cut, (d) (102) cut, (e) (111) cut, (f) both (001) cut and (110) cut

Photos taken in-situ during regeneration of Z-plates of a Tri-Prism shape: (a) formation of thin {101} layers generated from the normal angles on (001) cut, (b) formation of the other {101} faces by thin layers generated from apexes on the left and right side, (c) formation of prismatic faces

Schematic of regeneration of Z-plates of a Tri-Prism shape: (a) regeneration of the lower pyramidal faces, (b) regeneration of the upper pyramidal faces, (c) regeneration of the prismatic faces

The growth of thin surface layers in the incomplete prismatic faces with (a) irregular edges and (b) L-shaped

(a) The schematic of the attachment of growth units and (b) the formation of thin surface layers in the concave corners of prismatic face

Schematic of the growth of thin surface layers in (a) prismatic face from concave corners and (b) irregular edges

Regeneration of Z-cut plates: (a) formation of two thin {101} faces generated from a normal angle of Z-cut plate, (b) formation of the other {101} faces by thin surface layers generated from the apex

Schematics of (a) the attachment of growth unit to the normal angle on (001)-cut, and (b) the growth of pyramidal faces by thin surface layers

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