A new semiconducting ferroelectric [Ga[sub 1[minus]x]Ge[sub x]Te]

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90130-9· OSTI ID:7283876

Bose, D N; Pal, S ^[1]

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1. I.I.T., Kharagpur (India). Materials Science Centre

The dielectric properties of a new semiconducting alloy Ga[sub 1[minus]x]Ge[sub x]Te (x = 0.10--0.49) have been studied and found to show ferroelectric behavior. The crystal structure was found to be GaTe-like (monoclinic) up to x = 0.10 and changed to GeTe-like (rhombohedral) from x = 0.25. The dielectric constants ([var epsilon][sub [parallel]c] and [var epsilon][sub [perpendicular]c] ) at 300 K increased monotonically with x reaching 255 and 360 respectively at x = 0.49. The Curie temperature [Tc] decreased from 497 C for x = 0.10 to 428 C for x = 0.49, the transition being shown to be of second order. Ferroelectric behavior was confirmed by well-defined hysteresis curves, the spontaneous polarization (P[sub s]) being 5.75 [mu]C/cm[sup 2] and the coercive field (E[sub c]) 85 kV/cm at 300 K for x = 0.35. The band-gap of the alloy decreased from 1.66 eV for x = 0 to 0.62 eV for x = 0.49 indicating its semiconducting nature, the highest resistivity of 10[sup 5] [Omega]-cm being obtained in the layer plane for x = 0.10.

• OSTI ID: 7283876
• Journal Information: Materials Research Bulletin; (United States), Journal Name: Materials Research Bulletin; (United States) Vol. 29:2; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360606* -- Other Materials-- Physical Properties-- (1992-)
ALLOYS
CRYSTAL STRUCTURE
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
FERROELECTRIC MATERIALS
GALLIUM ALLOYS
GERMANIUM ALLOYS
MATERIALS
PHYSICAL PROPERTIES
SEMICONDUCTOR MATERIALS
TELLURIUM ALLOYS