caa a22 4500 469041692 CHVBK 20180323132813.0 cr unu---uuuuu 170328e19920401xx s 000 0 eng 10.1007/BF02875381 doi (NATIONALLICENCE)springer-10.1007/BF02875381 Structural and dielectric properties of Pb5(Ge,Si)O11 [Elektronische Daten] [R Choudhary, N Misra, P Chidambaram] The ferroelectric lead germanate (Pb5Ge3O11) and its isomorphous compounds are important because of their uses as pyroelectric and electro-optic devices. Comparison of inter-planar d-spacings of Pb5Ge3−x Si x O11 (x=0, 0.3, 0.7 and 1.00) suggests that there is no change in basic structure of Pb5Ge3−x Si x O11 when Si is substituted for Ge in small quantity (x<1). The dielectric properties of the Si-substituted compounds have been studied as a function of temperature (30 to 200°C). The ferroelectric-paraelectric phase transition has been observed at 185°C. The Si doping causes (a) Curie point to shift towards low temperature, (b) peak value of the dielectric constant to decrease and (c) phase transition diffuse. The fast increase in dielectric constant of pure Pb5Ge3O11 with temperature (beyond transition temperature) may be attributed to the development of space charge polarization in the system. Indian Academy of Sciences, 1992 Ferroelectrics nationallicence pyroelectric nationallicence dielectric constants nationallicence diffuse phase transitions nationallicence 77.80 nationallicence Choudhary R. Department of Physics, Indian Institute of Technology, 721 302, Kharagpur, India aut Misra N. Department of Physics, Indian Institute of Technology, 721 302, Kharagpur, India aut Chidambaram P. Department of Physics, Indian Institute of Technology, 721 302, Kharagpur, India aut Pramana Springer India 38/4(1992-04-01), 347-353 0304-4289 38:4<347 1992 38 12043 https://doi.org/10.1007/BF02875381 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02875381 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Choudhary R. Department of Physics, Indian Institute of Technology, 721 302, Kharagpur, India aut NATIONALLICENCE 700 1- Misra N. Department of Physics, Indian Institute of Technology, 721 302, Kharagpur, India aut NATIONALLICENCE 700 1- Chidambaram P. Department of Physics, Indian Institute of Technology, 721 302, Kharagpur, India aut NATIONALLICENCE 773 0- Pramana Springer India 38/4(1992-04-01), 347-353 0304-4289 38:4<347 1992 38 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer