水熱ZnO単結晶の成長の速度論と形態
スポンサーリンク
概要
- 論文の詳細を見る
Anisotropic growth rates, interface processes during growing and occurrence of an inversion twin of ZnO crystals have been studied under a hydrothermal condition as growth temperature 360°-380°C, temperature difference 10°-25°C, pressure 600-1000 bar, solvent 3.0mol KOH with 0-2.0mol LiOH.The results showed:(1) The growth rate was a function of growth temperature, concentration of LiOH added and temperature difference between dissolution and growth zones; under Li-free condition the activation energies in normal direction of basal and prismatic face, (0001) and (1010), were 20 and 80kcal/mol, respectively, whereas these energies almost reversed in 2.0mol LiOH.(2) The concentration of Li adsorbed on -c (0001) or O-layer side was higher than that on c (0001) or Zn-layer side. This anisotropic adsorption of Li seems to be caused by the growth environment or reductive atmosphere.(3) The growth mechanism on (0001) face distinctly changed from a rough pattern to a spiral step with the increase of adsorbed Li content.(4) The rate functions of Rg∝tm and Rg∝ΔTn had the transition point which can be regarded as the alteration of processes at the interface, where Rg is the growth rate of linear extention of a particular face, t the growth time, ΔT the temperature difference between dissolution and growth zones, m and n constants. It is phenomenologically concievable that a interface of the initial crystal growth from the seed crystals, and the one of the following principal growth can be corresponded to the processes of the growth on the rough surface or kink face and on the smooth surface or spiral step face, respectively. From the results obtained m=1/2 and n=1 for the initial growth, and m=-1/2 and n=1.5-1.7 for the principal growth.(5) A polar twin easily occurred from spontaneous nucleation. This twin was an inversion contact twin at the initial state of the growth. With progressing of the growth, the twinning shape which changed from the inversion contact to the inversion core twin was observed by chemical etch pattern on the cross section in parallel with the c-axis.Thus the growth kinetics and morphology of ZnO single crystal are closely correlated with calculated activation energies, adsorbed Li content in the crystal, the rate functions and micro-growth mechanism of a particular surface.
- 社団法人日本セラミックス協会の論文
- 1974-08-01
著者
関連論文
- 三硫化アンチモン系赤外ビディコン
- 印写工学のすすめ
- 不純物ドープ水熱育成酸化亜鉛の光学的性質
- リチウムおよび銅をドープした ZnO 単結晶の水熱育成
- 水晶の成長の速度論 : オートクレーブ内溶液温度による考察
- 人工水晶の成長速度 : オートクレーブ内部温度による考察 : 水熱法とフラックス法
- 結晶成長場の水熱状態の物性測定(その2) : フラックス成長
- 結晶成長場の水熱状態の一解明法 : 基礎
- 水熱育成ZnO単結晶の過剰Zn原子の直接測定と電気伝導率
- 水熱育成ZnO結晶中の液体包有物の加熱実験 : 水熱育成条件p-v-Tの確認として
- ZnO単結晶の極性と食像について : 基礎的考察
- 熱水溶液のp-v-T測定
- 水熱ZnO単結晶の成長の速度論と形態
- 電子産業界は不況というが
- 電子写真
- 水熱育成溶液の撹流現象の解析 : 水熱法