Abstract
The properties of X-ray source based on Sr0.61Ba0.39Nb2O6 crystals (SBN-61) having a large pyroelectric coefficient γ = 85 nC/(cm2K) was studied. When the crystal was heated to 60 ° C, X-rays from a tungsten target with energy of 8.4 keV were detected. The maximum energy of the electron beam was 52 keV. The visualization of the electron beam with a grid electrode and a fluorescent screen showed that the electron beam was inhomogeneous in the polar plane of the crystal and varied during heating.The radiation intensity was unstable in time. The work of the X-ray source was limited to electrical breakdowns between the polar faces of the crystal. When the crystal was cooled, there was no X-ray emission, which could be due to the depolarization of the crystal by the total electric field or as a result of electrical breakdowns. The crystals SBN-61 and LiNbO3 are compared.
Highlights
Pyroelectric crystals can be used to create portable sources of X-ray and neutron radiation.[1,2,3,4] In these devices, strong electric fields with strengths up to 100 kV/cm are produced due to uncompensated charges, which are formed on the surface of a pyroelectric crystal under temperature change by 50-100 ◦ C
We studied an X-ray source based on Sr0.61Ba0.39Nb2O6 crystals (SBN-61) having a significantly larger coefficient γ(SBN-61) = 85 nC/(cm2 )
It can be seen from the graph that there is a training effect, that is, in each subsequent cycle an increase in the radiation intensity and the maximum energy Emax is observed
Summary
Pyroelectric crystals can be used to create portable sources of X-ray and neutron radiation.[1,2,3,4] In these devices, strong electric fields with strengths up to 100 kV/cm are produced due to uncompensated charges, which are formed on the surface of a pyroelectric crystal under temperature change by 50-100 ◦ C. SBN crystals are relaxor ferroelectrics with a diffuse phase transition.[8] The temperature of the ferroelectric transition for SBN-61 is small and amounts to T c = 80◦ C. This limits the heating of crystals with a temperature of about 60◦ C Another feature of SBN crystals is a small coercive electric field, which for SBN-61 is Ec = 2 - 2.5 kV/cm. This indicates the possible instability of the domain structure, and, in particular, the possibility of the destruction of the single-domain state during electrical breakdowns
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