Calculation of the Spontaneous Polarization and the Dielectric Constant as a Function of Temperature for KH_𝟐PO_𝟒

Table 1

Observed values of the soft-mode response frequency w_ extrapolated at zero pressure at various temperatures in the ferroelectric phase of KDP [10].

𝑇 (K)	w_ (cm^−1)
45	150.1
60	148.9
80	145.3
90	142.7