INTERFACE KINETICS AND MECHANISM OF A NEW ORGANOMETALLIC COORDINATION COMPOUND: ATMB CRYSTAL. Xiling Yu, Yi Sun, Wenbo Hou, Shujun Zhang and Zhenxiang Cheng, The State Key Lab. of Crystal Materials, Shandong University, Jinan 250100, P.R.China

The interface growth kinetics and mechanism of organometallic coordination compound-triallylthiourea mercury bromide (ATMB) crystal have been studied, for the first time, by using real-time microscopic analysis system. The velocity V of straght line step trains movement and normal growth rate R of the crystal face have been measured in situ. The space between step trains is larger (from 2 um to 15 um) while the height is lower (h=0.04-0.25 um). The direction of steps movement is verticl to the step trains. The results are given following from the model of multiple two-dimensional (2D) nucleation. The specific free energy of the step riser per unit surface of the riser is about 0.05 (J.cm^-2). The relationship between the velocity V of steps and supersaturation ( is nonlinear. This is not in agreement with the classical theory of the layer-2D nuclei growth, since it is based on the linear relationship. This problem is also discussed.

* This research project is supported by the National Nature Science Foundation of China (NSFC).