Simultaneously imaging of dielectric properties and topography in a   PbTiO_3 crystal by near-field scanning microwave microscopy
  We use a near-field scanning microwave microscope to simultaneously image the dielectric constant, loss tangent, and topography in a PbTiO_3 crystal. By this method, we study the effects of the local dielectric constant and loss tangent in the geometry of periodic domains on the measured resonant frequency, and quality factor. We also carry out theoretical calculations and the results agree well with the experimental data and reveal the anisotropic nature of dielectric constant. 
Y.G. Wang, M. E. Reeves, and F.J. Rachford