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Once More About the "Forbidden" Domain Structure and the Isolated Point in K2Cd2xMn2(1-x)(SO4)3 Langbeinites
R. Vlokh, I. Girnyk, O. V. Vlokh +3
The domain structure in K2Cd2xMn2(1-x)(SO4)3 (x=0.5, 0.7 and 0.9) langbeinite crystals is studied with the aid of optical polarization microscopy. It is shown that the domain walls…
Comparative study of phase transitions in polycrystalline and epitaxial BaTiO3 thin films by means of specific heat measurements
B. Strukov, S. Davitadze, V. Lemanov +3
The experimental data on the thermal properties of the nanostructured perovskite ferroelectrics are presented and analysed. The ability of the modified 3w method for specific heat…
Second harmonic generation and X-ray diffraction studies of pretransitional region in relaxor K(1-x) LixTaO3
Hiroko Yokota, Yoshiaki Uesu, Charlotte Malibert +1
Optical second-harmonic-generation(SHG) observations and precise X-ray diffraction experiments have been performed on quantum paraelectrics KTaO3 (KTO) and relaxor K(1-x)LixTaO3 wi…
SHG microscopic observations of polar state in Li-doped KTaO3 under electric field
Hiroko Yokota, Taeko Ohyama, Yoshiaki Uesu
Incipient ferroelectric KTaO3 with off-center Li impurity of the critical concentration of 2.8 mol% was investigated in order to clarify the dipole glass state under electric field…
Origin of dielectric relaxation observed in complex perovskite oxides Ba(1-x)La(x)Ti(1-x)Cr(x)O3
Mamoru Fukunaga, Yoshiaki Uesu
Frequency dependence of the dielectric constant of complex perovskite oxide Ba(1-x)La(x)Ti(1-x)Cr(x)O3 (BLTC) ceramics with the composition ratio 0.4<= x <= 0.7 is precisely measur…
Polar Order in Quantum Paraelectric SrTiO3-16 and SrTiO3-18 at Low Temperature
Yoshiaki Uesu, Ryuhei Nakai, Jean-Michel Kiat +3
Optical second-harmonic generation (SHG) in SrTi16O3 (STO16) and SrTi18O3 (STO18) was investigated using the SHG microscope. While no-biased STO16 exhibits weak and almost temperat…
Monoclinic structure of unpoled morphotropic high piezoelectric (PbMg1/3Nb2/3O3)0.65-(PbTiO3)0.35 and (PbZn1/3Nb2/3O3)0.91-(PbTiO3)0.09 compounds
J-M. Kiat, Y. Uesu, B. Dkhil +3
Evidences of a monoclinic phase in unpoled (PbMg1/3Nb2/3O3)1-x-(PbTiO3)x with x=0.35 (PMN-PT 35%) and unpoled (PbZn1/3Nb2/3O3)1-x-(PbTiO3)x with x=0.09 (PZN-PT 9%) are presented fr…
Symmetry of high-piezoelectric Pb-based complex perovskites at the morphotropic phase boundary II. Theoretical treatment
Yasusada Yamada, Yoshiaki Uesu, Masaaki Matsuda +4
The structural characteristics of the perovskite- based ferroelectric Pb(Zn1/3Nb2/3)O3-9%PbTiO3 at the morphotropic phase boundary (MPB) region (x≃0.09) have been analyzed. T…
Symmetry of high-piezoelectric Pb-based complex perovskites at the morphotropic phase boundary I. Neutron diffraction study on Pb(Zn1/3Nb2/3)O3 -9%PbTiO3
Yoshiaki Uesu, Masaaki Matsuda, Yasusada Yamada +4
The symmetry was examined using neutron diffraction method on Pb(Zn1/3Nb2/3)O3 -9%PbTiO3 (PZN/9PT) which has a composition at the morphotropic phase boundary (MPB) between Pb(Zn1/3…
Universal Phase Diagram for High-Piezoelectric Perovskite Systems
D. E. Cox, B. Noheda, G. Shirane +3
Strong piezoelectricity in the perovskite-type PbZr(1-x)TixO3 (PZT) and Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) systems is generally associated with the existence of a morphotropic phase…