caa a22 4500 467943869 CHVBK 20180322200724.0 cr unu---uuuuu 170328e19861001xx s 000 0 eng 10.1007/BF00553796 doi (NATIONALLICENCE)springer-10.1007/BF00553796 (NATIONALLICENCE)springer-10.1007/BF02402998 Diffuse phase transformations in neodymium-doped BaTiO3 ceramics [Elektronische Daten] [P. Murugaraj, T. Kutty, M. Subba Rao] Phase transitions in BaTiO3 doped with neodymium have been studied using temperature-capacitance measurements, differential scanning calorimetry, X-ray powder diffraction and electron paramagnetic resonance spectroscopy. The coexistence of a para-electric cubic phase with the ferroelectric tetragonal and orthorhombic phases is noticed within the temperature range corresponding to the stability region of the latter phases in undoped BaTiO3. The broad maximum in the effective dielectric constant shifts to lower temperature with increase in neodymium content. The heat of transformation measured at the Curie point tends to zero above 3.5at%Nd and the phase transition gradually approaches the second order. These are characteristics of a diffuse phase transformation. Using the quantitative results from the above studies, a T-x topological diagram is constructed for the BaTiO3-xNd system wherex < 5.5at%. The phase contents vary with processing parameters as well as grain size, and the very existence of more than one phase in a given area of the T-x diagram indicates the metastable thermodynamic equilibrium prevailing in BaTiO3-Nd ceramics. The inhomogeneous distribution of lattice defects may be the major cause for such a behaviour. Chapman and Hall Ltd, 1986 Murugaraj P. Materials Research Laboratory, Indian Institute of Science, 560 012, Bangalore, India aut Kutty T. Materials Research Laboratory, Indian Institute of Science, 560 012, Bangalore, India aut Subba Rao M. Department of Inorganic and Physical Chemistry, Indian Institute of Science, 560 012, Bangalore, India aut Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3521-3527 0022-2461 21:10<3521 1986 21 10853 https://doi.org/10.1007/BF00553796 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553796 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murugaraj P. Materials Research Laboratory, Indian Institute of Science, 560 012, Bangalore, India aut NATIONALLICENCE 700 1- Kutty T. Materials Research Laboratory, Indian Institute of Science, 560 012, Bangalore, India aut NATIONALLICENCE 700 1- Subba Rao M. Department of Inorganic and Physical Chemistry, Indian Institute of Science, 560 012, Bangalore, India aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3521-3527 0022-2461 21:10<3521 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02402998 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer