The measurement (tan δ) is performed using capacitance bridges, which automatically or manually balances the capacitance and dissipation of the sample with known standards. When a sample is prepared to a parallel capacitor geometry, the capacitance and the dissipation can be converted to real and imaginary part of dielectric constant (ε′ and ε″ respectively) using relations of C=ε0 ε′ Area ⁄ (thickness) and tan δ= ε″ ⁄ ε′ , where ε0 is permittivity of air.
Images & Sample Data
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A typical sample configuration for the capacitance measurement.
A typical sample configuration for the capacitance measurement.
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Dielectric constant of SmMnO3 single crystal as a function of temperature.
Dielectric constant of SmMnO3 single crystal as a function of temperature.
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Magnetic field dependence of dielectric constant of SrNdFeO4 single crystal.
Magnetic field dependence of dielectric constant of SrNdFeO4 single crystal.
https://nationalmaglab.org/user-facilities/dc-field/dcfield-techniques/dielectric-capacitance-dc#sigProIdffef755c63
Instrumentation
Resistive Magnets
Superconducting Magnets
- Andeen-Hagerling Model 2700A capacitance bridge (50 – 20 kHz)
- General Radio 1615A capacitance bridge (50 – 10 kHz)
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