Preparation of BaxSrl-xTiO3 Pyroelectric Ceramics by Sol-Gel Technique

Abstract

Abstract: The Ba_xSr_1-xTiO₃ (BST) materials of various compositions (x=0.75,0.70,0.60) were prepared by sol-gel processing.
The reaction mechanism was investigated by FT-IR technique. The thermolysis process of the BST-gel was analyzed by DTA and XRD. The dependence of Curie point on compositions
and the properties of the IR detection for the BST sample under dc bias were also studied. The results showed that the synthetic
temperature of BST powder is 930℃, which is much lower than that by the conventional solid-state reaction method, the BST powder
obtained has a narrow distribution. The sintering temperature falls from 1380℃ to 1320℃, the overgrowth of the grain is constrained
and the average grain size is ～5μm. The relative permittivity of the BST sample increases by 20% over that by the conventional
processing, the minimum dissipation factor measured is 0.0025, and the pyroelectric coefficient reaches at 20×10^-8C/cm²·K.

Key words: sol-gel, barium strontium, titanate, IR detection

CLC Number:

TN304

ZENG Hua-Rong,QU Cul-Feng,YAO Chun-Hua,JIN Qi-HuaSUN Da-Zhi,LIN Sheng-Wei. Preparation of Ba_xSr_l-xTiO₃ Pyroelectric Ceramics by Sol-Gel Technique[J]. Journal of Inorganic Materials.

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Preparation of Ba_xSr_l-xTiO₃ Pyroelectric Ceramics by Sol-Gel Technique

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