Emission images of the (0001) plane of monocrystalline hafnium were observed in the temperature interval l800-2100°K in an electron emission microscope in a 5x10^(-8) mm*Hg vacuum. The transition from the α-phase to the β-phase is preceded by a stable intermediate state of the crystal at T = 2020 ± 5 K. The transition αHf→βHf at T= 2050 ± 5К occurs after a time interval of Δt ~ 2 min. The effective work functions of hafnium were measured in the α-phase as (ϕ(α)= 4,1 ± 0,05 V) and in the β-phase as (ϕ(β)= 3,9±0,5 V).
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