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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of relaxation times in perovskite-type relaxor ferroelectrics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 1934-1939 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution of relaxation times in perovskite-type relaxor ferroelectrics is studied by computer simulation. It has been proved that the spectra move to longer relaxation times with the decreasing of temperature and the increasing of the external field. The frequency dispersion of relaxors is explained by a gradual freezing process of polar microregions. The relationship between the time dependence of the polarization and the relaxation time distribution at various temperatures and external fields has been investigated. The macroscopic polarization is suggested to be sustained mainly by frozen dipoles during the observation time. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360231
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  • 2
    Electronic Resource
    Electronic Resource
    Probability wave theory of the atomic configuration for multicomponent crystal structures and its application to the ordered structure of complex perovskite materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4224-4232 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The probability wave of the atomic configuration is used to study the occupation probabilities of different kinds of atoms at lattice sites in multicomponent solid solutions and predict the crystal structures of multicomponent solid solutions. The theory of the probability wave of atomic configuration is applied to study the atomic configuration of the most stable superlattices formed in the complex perovskite structure. Seven basic ordered structures are deduced theoretically; these have been compared with the experiment results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349148
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  • 3
    Electronic Resource
    Electronic Resource
    A size estimation of ordered domains in Pb(Mg1/3Nb2/3)O3 ceramics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5822-5826 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The size of ordered domains in Pb(Mg1/3Nb2/3)O3 ceramics is estimated by minimizing the Helmholtz free energy of the system. All the differences between the ordered domains and the disordered matrix are taken into consideration. The charge imbalance plays an important role in the system. The theoretical estimation agrees satisfactorily with measured results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351937
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  • 4
    Electronic Resource
    Electronic Resource
    Dielectric response process in relaxor ferroelectrics (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2353-2355 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dielectric constant cursive-epsilon*(ω,T)=cursive-epsilon′(ω,T)+icursive-epsilon″(ω,T) of relaxor ferroelectrics is simulated by the Monte Carlo method. It is proved that the polar microregions switch among different polarization directions as a whole under the electrical field, giving rise to the high dielectric constant. The relaxor characteristics are caused by the randomly distributed interactions between the polar microregions. Factors which influence the dielectric response process are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117522
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  • 5
    Electronic Resource
    Electronic Resource
    Ferroelectric 90° Domain Evaluation in Tetragonal Pb(Mg1/3Nb2/3)O3–PbTiO3 Ceramics (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The domain structure of ferroelectrics changes during poling has a direct influence on the macroscopic properties of the materials. The intensity variation of the different X-ray diffraction (XRD) pattern profiles was used to identify the percentage of 90° domain reorientation in the tetragonal phase of Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) ceramics after poling. The results are consistent with the change of piezoelectric properties. In addition, by using XRD patterns, a spatial distribution of polarization in a well-poled 0.62PMN–0.38PT ceramics has been determined and was found to be best described by the Cauchy function W00l (ϕ)=1/(1+0.023ϕ2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00101.x
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  • 6
    Electronic Resource
    Electronic Resource
    Direct Compositional Analysis of Ordered Domains in Pure and La-Doped Pb(Mg1/3Nb2/3)O3 by Analytical Electron Microscopy Techniques (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The ordered domain structures in Pb(Mg1/3Nb2/3)O3(PMN) and Pb1–xLax(Mg1/3Nb2/3)O3 are identified using high-resolution transmission electron microscopy (HRTEM) and nanobeam diffractometry (NBD). The chemical compositions in the ordered domains and in the disordered matrices are also acquired using energy-dispersive spectroscopy (EDS). The best matching computer-simulated HRTEM image has a Mg2+/Nb2+ ratio of return ½. There is no obvious chemical composition difference between the ordered domains and the disordered matrices. The number of the normalized total positive valence electrons remains almost constant in the ordered domains and in the disordered matrices for all the samples. The reason for the growth of the ordered domains in La-doped PMN also is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00963.x
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of dopants on ageing properties for the PMN-0.1 PT relaxor ferroelectric ceramics (1996)
    Springer
    Journal of materials science 7 (1996), S. 133-135 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Isothermal ageing properties of the typical ferroelectric relaxor system Pb(Mg1/3Nb2/3)O3-PbTiO3 (abbreviated as PMN-0.1 PT) doped with different kinds of oxides were measured and the effect of dopants on ageing inducing was investigated. The metallic ions of additives were considered to enter sites A or B in the perovskite structure with similar radii and their roles were distinguished as donors, acceptors or equivalent substitutors due to their valences. For the additions of acceptors, dielectric ageing is evident while no obvious ageing was found in the non-doped equivalently substituted or donor-doped PMN-0.1 PT systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225636
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  • 8
    Electronic Resource
    Electronic Resource
    High-resolution electron microscope study of the ordered lead-calcium titanate ceramics (1996)
    Springer
    Journal of materials science 31 (1996), S. 1495-1499 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract High-resolution electron microscopy (HREM) has been used to demonstrate the structural characteristics of ordered (Pb0.5Ca0.5) TiO3. The fine structure of both ordered and disordered domains was exposed in lattice level. It was shown that there are 1/2 {111}, 1/2 {110} and 1/2 {111} ordering coexisted in (Pb0.5Ca0.5) TiO3 and all of them are chemical ordering due to the layers of Pb2+ and Ca2+ cations align alternatively along different directions. For 1/2 {111} chemical ordering, a special type of boundary defined as “vernier boundary” was introduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357858
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