首页> 外文期刊>Chemistry: A European journal >A density functional study of phosphorus nitride P_3N_5: refined geometries, properties, and relative stability of alpha-P_3N_5 and gamma-P_3N_5 and a further possible high-pressure phase delta-P_3N_5 with kyanite-type structure
【24h】

A density functional study of phosphorus nitride P_3N_5: refined geometries, properties, and relative stability of alpha-P_3N_5 and gamma-P_3N_5 and a further possible high-pressure phase delta-P_3N_5 with kyanite-type structure

机译:氮化磷P_3N_5的密度泛函研究:alpha-P_3N_5和gamma-P_3N_5的精细几何形状,性质和相对稳定性,以及蓝晶石型结构的进一步可能的高压相δ-P_3N_5

获取原文
获取原文并翻译 | 示例
           

摘要

The crystal structures and the enthalpy-pressure phase diagram of P_3N_5 were investigated by using density functional methods. Applying both approximations to the electron exchange and correlation gives a consistent picture for the two known polymorphs, alpha-P_3N_5 and gamma-P_3N_5. The calculated zonecenter phonon modes compare very well with the experimental results. They indicate low-frequency bending modes for two-coordinate N atoms alpha-P_3N_5, which are responsible for a C2/c->Cc structural modulation of alpha-P_3N_5 at moderate pressures. alpha-P_3N_5 transforms into gamma-P_3N_5 at pressures of about 6 GPa. We propose gamma-P_3N_5 transforms into a delta-P_3N_5 with Kyanite-type structure at pressures exceeding 43 GPa. Upon quenching, this triclinic modification of P_3N_5 is likely to distort into a more symmetric monoclinic structure.
机译:采用密度泛函方法研究了P_3N_5的晶体结构和焓-压相图。将近似值应用于电子交换和相关性,可以得出两个已知的多晶型体alpha-P_3N_5和gamma-P_3N_5的一致图片。计算得到的区域中心声子模式与实验结果非常吻合。它们指示了两个坐标N原子alpha-P_3N_5的低频弯曲模式,这些模式负责在中等压力下对alpha-P_3N_5进行C2 / c-> Cc结构调节。在约6 GPa的压力下,alpha-P_3N_5转换为gamma-P_3N_5。我们建议在超过43 GPa的压力下将gamma-P_3N_5转换为具有蓝晶石型结构的delta-P_3N_5。淬灭后,P_3N_5的三斜晶修饰可能会变形为更对称的单斜晶结构。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号