PbTiO3基玻璃陶瓷的微结构和介电性能研究

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019 Pub Date : 2019-10-29 DOI:10.1063/1.5130255

J. Shankar, G. Rani, J. Anjaiah, P. Raju, V. Deshpande

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引用次数: 1

摘要

采用常规淬火技术制备了组分为(35-X) B2O3−(40 +X) PbO - 25 TiO2 (X= 0、2.5、5、7.5和10 mol %)的玻璃样品。随着PbO含量的增加，玻璃化转变温度(Tg)和结晶温度(Tc)降低。用更大的Pb离子取代硼，通过降低玻璃化转变温度(Tg)扩大了那里的网络。这些玻璃样品通过以下两阶段热处理程序转化为玻璃陶瓷。玻璃陶瓷样品的密度(ρ)值高于相应的玻璃样品。结果表明，微晶玻璃的密度与热膨胀系数(CTE)之间存在良好的相关性。XRD结果表明，该玻璃陶瓷的主要晶相为四方钛酸铅(PbTiO3)，次要晶相为硼酸铅(PbB2O4)。玻璃陶瓷样品的微观结构包含钛酸铅纳米晶嵌入硼酸盐玻璃基体。随着玻璃原体(B2O3)含量的降低，在玻璃基体中析出的PbTiO3晶体增多。玻璃陶瓷样品的介电常数值高于相应的玻璃样品。采用常规淬火技术制备了组分为(35-X) B2O3−(40 +X) PbO - 25 TiO2 (X= 0、2.5、5、7.5和10 mol %)的玻璃样品。随着PbO含量的增加，玻璃化转变温度(Tg)和结晶温度(Tc)降低。用更大的Pb离子取代硼，通过降低玻璃化转变温度(Tg)扩大了那里的网络。这些玻璃样品通过以下两阶段热处理程序转化为玻璃陶瓷。玻璃陶瓷样品的密度(ρ)值高于相应的玻璃样品。结果表明，微晶玻璃的密度与热膨胀系数(CTE)之间存在良好的相关性。XRD结果表明，该玻璃陶瓷的主要晶相为四方钛酸铅(PbTiO3)，次要晶相为硼酸铅(PbB2O4)。玻璃陶瓷样品的微观结构中含有纳米微晶。

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Study of microstructure and dielectric properties of PbTiO3 based glass ceramics

Glass samples with composition (35-X) B2O3 − (40 +X) PbO - 25 TiO2 (where X= 0, 2.5,5, 7.5 and 10 mol %) were prepared using conventional quenching technique. It was observed that as PbO content increases the values glass transition temperature (Tg) and crystallization temperature (Tc) decreases. The replacement of boron by a bigger Pb ion expands the network there by reducing the glass transition temperature (Tg). These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The density(ρ) values of glass ceramic samples are higher than those of corresponding glass samples. It was observed that there was good correlation between the density and Coefficient of Thermal Expansion (CTE) results of the glass–ceramics. The XRD results in the glass ceramics revealed the formation of tetragonal lead titanate (PbTiO3) as a major crystalline phase and lead borate (PbB2O4) as minor crystalline phase. The microstructure of glass ceramic samples contains nano crystallites of lead titanate embedded in a borate glass matrix. As the content of glass former (B2O3) is reduced, the PbTiO3 crystals precipitated in glass matrix are observed to increase. The dielectric constant values of glass ceramic samples are higher than those of corresponding glass samples.Glass samples with composition (35-X) B2O3 − (40 +X) PbO - 25 TiO2 (where X= 0, 2.5,5, 7.5 and 10 mol %) were prepared using conventional quenching technique. It was observed that as PbO content increases the values glass transition temperature (Tg) and crystallization temperature (Tc) decreases. The replacement of boron by a bigger Pb ion expands the network there by reducing the glass transition temperature (Tg). These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The density(ρ) values of glass ceramic samples are higher than those of corresponding glass samples. It was observed that there was good correlation between the density and Coefficient of Thermal Expansion (CTE) results of the glass–ceramics. The XRD results in the glass ceramics revealed the formation of tetragonal lead titanate (PbTiO3) as a major crystalline phase and lead borate (PbB2O4) as minor crystalline phase. The microstructure of glass ceramic samples contains nano crystallites of lea...

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PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019

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