| Sr3SiO5降温过程分解及对制备Sr3SiO5∶Eu2+的影响 |
| Influences of Sr3SiO5 Decompose on the Cooling Process on the Preparation of Sr3SiO5∶Eu2+ |
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| 摘要: 采用高温固相反应法制备Sr3SiO5∶Eu2+时，往往有Sr2SiO4∶Eu2+共存，从而影响Sr3SiO5∶Eu2+的发光性能。本文采用DSC/TG、淬冷法结合XRD，研究了Sr3SiO5∶Eu2+在降温过程中的分解反应。结果表明，Sr3SiO5是在1 250 ℃以上稳定存在的化合物，在降温过程中Sr3SiO5在1 250 ℃分解为Sr2SiO4和SrO。采用快速降温的方法可以抑制Sr3SiO5的分解。当降温速率小于10 ℃·min-1时，Sr3SiO5全部分解为Sr2SiO4和SrO；当降温速率为15 ℃·min-1时，样品主要物相为Sr3SiO5，但有少部分Sr3SiO5发生分解，当降温速率增大到20 ℃·min-1时，Sr3SiO5分解的量更少，即随着降温速率增大，Sr3SiO5分解的量减小，从而获得几近纯相的Sr3SiO5∶Eu2+荧光粉。 |
| 关键词: Sr3SiO5∶Eu2+ 降温分解 淬冷法 降温速率 |
| 基金项目: |
| Abstract: When Sr3SiO5∶Eu2+ was prepared by high temperature solid state method, Sr2SiO4∶Eu2+ phase often coexists and affects the luminescent properties of Sr3SiO5∶Eu2+. In the cooling process, the decompose reaction of Sr3SiO5∶Eu2+ were studied by DSC/TG, quenching method and XRD. Results indicate that the Sr3SiO5∶Eu2+ phase is a stable structure above 1 250 ℃. In the cooling process, the Sr3SiO5∶Eu2+ phosphor will be decomposed down into Sr2SiO4 and SrO at 1 250 ℃, and the decomposition of Sr3SiO5∶Eu2+ phosphor can be restrained by rapid cooling method. When the cooling rate less than 10 ℃·min-1, all Sr3SiO5∶Eu2+ decompose into Sr2SiO4 and SrO. When the cooling rate for 15 ℃·min-1, the main object of samples is Sr3SiO5∶Eu2+, but there are still a few Sr3SiO5∶Eu2+ decomposition. When the cooling rate is more than 20 ℃·min-1, decomposition of Sr3SiO5∶Eu2+ phase is less. Sr3SiO5∶Eu2+ decomposition reduced with increases of the cooling rate, and the pure Sr3SiO5∶Eu2+ phosphor can be obtained. |
| Keywords: Sr3SiO5∶Eu2+ cooling decomposition quenching method cooling rate |
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| 王晓春,张希艳,张烨明,马良来.Sr3SiO5降温过程分解及对制备Sr3SiO5∶Eu2+的影响[J].无机化学学报,2012,28(8):1570-1574. |
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