Structural and dielectric/ferroelectric properties of (La{sub 1-x}Nd{sub x}){sub 2}Ti{sub 2}O{sub 7} synthesized by sol-gel route

• Published in: Journal of solid state chemistry Vol. 183; no. 7
• Main Authors: Shao Zhenmian, UArtois, UCCS, F-62300 Lens, CNRS, UMR 8181, F-59650 Villeneuve d'Ascq, ENSCL, UCCS, F-59652 Villeneuve d'Ascq, Saitzek, Sebastien, Roussel, Pascal, Mentre, Olivier, Prihor Gheorghiu, Felicia, Mitoseriu, Liliana, Desfeux, Rachel
• Format: Journal Article
• Language: English
• Published: United States 15-07-2010
• Subjects: CHEMICAL ANALYSIS; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DECOMPOSITION; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; DIFFRACTION; DISPERSIONS; ELECTRICAL PROPERTIES; ELECTRICITY; FERROELECTRIC MATERIALS; GRAVIMETRIC ANALYSIS; HOMOGENEOUS MIXTURES; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; MASS SPECTROSCOPY; MATERIALS; MATERIALS SCIENCE; MINERALS; MIXTURES; MONOCLINIC LATTICES; NEODYMIUM COMPOUNDS; OXIDE MINERALS; OXYGEN COMPOUNDS; PEROVSKITE; PEROVSKITES; PHYSICAL PROPERTIES; PIEZOELECTRICITY; QUANTITATIVE CHEMICAL ANALYSIS; RARE EARTH COMPOUNDS; SCATTERING; SOL-GEL PROCESS; SOLID SOLUTIONS; SOLUTIONS; SPECTROSCOPY; TEMPERATURE RANGE; TEMPERATURE RANGE 1000-4000 K; TITANATES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; X-RAY DIFFRACTION
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.05.004

A series of compounds with the general formula (La{sub 1-x}Nd{sub x}){sub 2}Ti{sub 2}O{sub 7} (0.0{<=}x{<=}1.0) has been prepared by the sol-gel method. The decomposition of the gel was characterized by thermo-gravimetric analysis coupled to mass spectrometry, indicating the reaction is achieved above 850 {sup o}C. The lattice parameters versus x show an expected decrease in the a and b parameters while c and the {beta} angle remain almost unchanged with respect to the monoclinic symmetry conserved for the full solid solution. Dielectric, piezoelectric and ferroelectric properties were measured on the entire series. - Graphical abstract: XRD patterns of (La{sub 1-x}Nd{sub x}){sub 2}Ti{sub 2}O{sub 7} powders for various x values. The (hkl) peaks positions (with h and k{ne}0) change with x values while the (00l) peaks positions remain unaffected.