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Phase transition in Pb4.9A0.1Ge2.7Si0.3O11 (A=Ca,Sr,Ba) ferroelectrics

✍ Scribed by N.K. Mishra; R. Sati; R.N.P. Choudhary

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 363 KB
Volume: 60
Category: Article
ISSN: 0022-3697
DOI: 10.1016/s0022-3697(99)00205-x

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✦ Synopsis

Polycrystalline samples of modified lead germanate Pb 4.9 A 0.1 Ge 2.7 Si 0.3 O 11 A Ca; Sr; Ba have been prepared by solid-state reaction technique. X-ray studies have been carried out to check the formation of single-phase composition and to obtain preliminary structural data. Measurements of dielectric permittivity (1) and loss (tan d) have been studied both as a function of frequency (10 2 -10 4 Hz) and temperature (room temperature to 180ЊC). Phase transition was observed in all three cases but with different T c value. From the plots of conductivity vs. temperature using dielectric data, collected at 10 kHz activation energy was calculated to investigate the conduction mechanism in them.

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