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Citation: Fang Liang, Zhang Hui, Yan Jun-Bing, Yang Wei-Ming. Structure and Dielectric Properties of New Tantalates Ba₂LaTi₂Ta₃O₁₅ (Ln=Y, La)[J]. Acta Physico-Chimica Sinica, ;2003, 19(01): 82-84. doi: 10.3866/PKU.WHXB20030119 shu

Structure and Dielectric Properties of New Tantalates Ba₂LaTi₂Ta₃O₁₅ (Ln=Y, La)

1.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology,

Received Date: 27 May 2002
Available Online: 15 January 2003

New tantalates Ba2LnTi2Ta3O15 (Ln=Y, La) were synthesized by Ln partial substitution for Ba in the crystal structure of Ba3TiTa4O15.The crystal structure and dielectric properties were determined by X-ray powder diffraction and dielectric measurements. The results show that Ba2YTi2Ta3O15 belongs to ferroelectric phase of tetra nal tungsten bronze structure at room temperature with unit cell parameters: a=1.236 46(4) nm, c=0.388 60(2) nm. The phase transition of Ba2YTi2Ta3O15 from ferroelectric to paraelectric occurred at 180 ℃. Ba2LaTi2Ta3O15 belongs to paraelectric phase of tetra nal tungsten bronze structure at room temperature with unit cell parameters: a=1.242 64(5) nm, c=0.391 57(2) nm. At room temperature, the dielectric constant (εr) of Ba2YTi2Ta3O15 approached 107, while Ba2LaTi2Ta3O15 ceramic approached 194,combined with a low dielectric loss of 8×10－4 at 1 MHz. Ba2LaTi2Ta3O15 might be a suitable candidate of high εr microwave dielectric ceramics.
- Tantalate;Tungsten bronze structure;XRD;Dielectric property
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Structure and Dielectric Properties of New Tantalates Ba2LaTi2Ta3O15 (Ln=Y, La)

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通讯作者: 陈斌, bchen63@163.com

Structure and Dielectric Properties of New Tantalates Ba₂LaTi₂Ta₃O₁₅ (Ln=Y, La)