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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Nucleation and growth kinetics of co-deposited copper and selenium precursors to form metastable copper selenides
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Nucleation and growth kinetics of co-deposited copper and selenium precursors to form metastable copper selenides

机译：共沉积铜和硒前体形成亚稳态硒化铜的成核和生长动力学

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摘要

The nucleation and growth kinetics of binary copper-selenium compounds from co-deposited copper and selenium films as a function of annealing temperature and time was investigated. The thermally driven evolution of crystalline phases was followed using differential scanning calorimetry and X-ray diffraction. Below 60% selenium, hexagonal α-CuSe formed during the deposition and a reversible endothermic transition at ～130 °C was observed for the phase transition into hexagonal γ-CuSe. Above 60% selenium the samples are amorphous as deposited and there is competition between the formation of γ-CuSe and cubic CuSe_2 as annealing temperature is increased. Slow rates of temperature increase favor the formation of CuSe_2 over -γ-CuSe and near 66% selenium only cubic CuSe_2 forms during an exothermic event between 100°C and 110°C It is surprising that the metastable cubic CuSe_2 initially nucleates and grows rather than the thermodynamically stable orthorhombic CuSe_2 polymorph. Kissinger analysis yields an activation energy for nucleation of 1.6 eV for cubic CuSe_2. CuSe nucleates throughout the composition region investigated. Hexagonal a-CuSe reacts with selenium to form the thermodynamically stable orthorhombic polymorph of CuSe_2 as the temperature approaches the melting point of selenium.
机译：研究了共沉积铜和硒膜中二元铜-硒化合物的成核和生长动力学随退火温度和时间的变化。使用差示扫描量热法和X射线衍射追踪结晶相的热驱动演化。硒含量低于60％时，在沉积过程中形成了六方晶型的α-CuSe，并在〜130°C时发生了可逆的吸热转变，相转变为六方晶型的γ-CuSe。硒含量超过60％时，样品沉积为非晶态，并且随着退火温度的升高，γ-CuSe和立方CuSe_2的形成之间存在竞争。缓慢的升温速率有利于形成CuSe_2而不是-γ-CuSe，并且在100°C至110°C的放热过程中仅形成约66％的硒，仅形成立方CuSe_2。热力学稳定的斜方晶CuSe_2多晶型物。基辛格分析得出立方CuSe_2的成核活化能为1.6 eV。 CuSe在整个所研究的组成区域中成核。当温度接近硒的熔点时，六角形的a-CuSe与硒反应形成CuSe_2的热力学稳定的正交晶型。

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