The best replacement for ph3 is nh3.

The best alternatives to ph3 are rated as following:
★★★★★  nh3
★★★  nh3 higher vapor pressure
★★★  ash3 higher boiling point
★★  nh3 stronger acid
★★  nh3 higher boiling point
★★  h3p
★  phase 90
  nh3 more polar
  ph2

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ph3
nh3
nh3 higher vapor pressure