NPD-4000 (M) PLD脉冲激光沉积系�?参数-价格-中国粉体罐�/title>

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$(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p><span><span><strong>PLD激光脉冲沉积技�?/strong></span></span></p><p><span><span><strong>NPD-4000（M）PLD脉冲激光沉积系绞�/strong>机制９�/span></span></p><p><span><span>PLD的系统设备简单，相反，它的原理却是非常复杂的</span><span>物理现象</span><span>。它涉及高能量脉冲辐射冲击固体靶时，激光与物质之间的所有物理相互作用，亦包括等离子羽状物的形成，其后已熔化的物质通过等离子羽状物到达已加热的基片表面的转移，�?后的膜生成过程。所以，PLD一般可以分为以下四个阶段：</span></span></p><p><span><span>1. </span><span>激光辐尃�/span><span>与靶的相互作�?/span></span></p><p><span><span>2. 熔化物质的动�?/span></span></p><p><span><span>3. 熔化物质在基片的沉积</span></span></p><p><span><span>4. 薄膜在基片表面的成核（nucleation）与生成</span></span></p><p><span><span>�?*阶段，激光束聚焦在靶的表面。达到足够的高能量通量与短脉冲宽度时，靶表面的一切元素会快速受热，到达蒸发温度。物质会从靶中分离出来，而蒸发出来的物质的成分与靶的化学计量相同。物质的瞬时溶化率大大取决於激光照射到靶上的流量。熔化机制涉及许多复杂的物理现象，例如碰撞、热，与电子的激发、层离，以及流体力学、�/span></span></p><p><span><span>在第二阶段，根据气体动力学定律，发射出来的物质有移向基片的倾向，并出现向前散射峰化现象。空间厚度随函数cosn��而变化，而n>>1。激光光斑的面积与等离子的温度，对沉积膜是否均匀有重要的影响。靶与基片的距离是另一个因素，支配熔化物质的角度范围。亦发现，将一块障板放近基片会缩小角度范围、�/span></span></p><p><span><span>第三阶段是决定薄膜质量的关键。放射出的高能核素碰击基片表面，可能对基片造成各种破坏。下图表明了相互作用的机制。高能核素溅射表面的部分原子，而在入射流与受溅射原子之间，建立了一个碰撞区。膜在这个热能区（碰撞区）形成后立即生成，这个区域正好成为凝结粒子的**场所。只要凝结率比受溅射粒子的释放率高，热平衡状况便能够快速达到，由於熔化粒子流减弱，膜便能在基片表面生成、�/span></span></p><h2><span><span><strong>NPD-4000（M）PLD脉冲激光沉积系绞�/strong>概述</span></span><span><span>：该系统为PC计算机全自动控制的立柜式系统，具有占地面积小、性价比高的优点。占地面积尺寸为26"x42"x44"。不锈钢立柜，可以选择Auto Load/Unload配置、�/span></span></h2><h2><span><span><strong>NPD-4000（M）PLD脉冲激光沉积系绞�/strong>主要优点９�/span></span></h2><p><span><span>1. 易获得期望化学计量比的多组分薄膜，即具有良好的保成分性；</span></span></p><p><span><span>2. 沉积速率高，试验周期短，衬底温度要求低，制备的薄膜均匀：�/span></span></p><p><span><span>3. 工艺参数任意调节，对靶材的种类没有限制；</span></span></p><p><span><span>4. 发展潜力巨大，具有极大的兼容性；</span></span></p><p><span><span>5. 便于清洁处理，可以制备多种薄膜材料、�/span></span></p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; 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