Hongchao Liu and Hideo Toraya, Study on a new tetragonal phase of Nb-doped lead titanate zirconate by synchrotron X-ray powder diffraction // Journal of Physics and Chemistry of Solids. - 1999. - vol. 60. - №6. p. 729 - 735
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http://dx.doi.org/10.1016/S0022-3697(98)00346-1
Большое спасибо )