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镱氧-氧化镁共掺杂的0.92钛酸钡-0.08（钠铋）钛酸铁电弛豫体的结构与介电行为

Structure and Dielectric Behavior of YbO-MgO Co-Doped 0.92BaTiO-0.08(NaBi)TiO Ferroelectric Relaxor.

作者信息

Ren Xiao-Hu, Gui Dong-Yun

机构信息

College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710054, China.

出版信息

Materials (Basel). 2021 Nov 11;14(22):6802. doi: 10.3390/ma14226802.

DOI:10.3390/ma14226802
PMID:34832202
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8618925/
Abstract

Dielectric properties and structure of 0.015YbO-MgO doped 0.92BaTiO-0.08(NaBi)TiO ceramics with = 0.0-0.025 have been investigated. As YbO-MgO was added into the BT-NBT, the phase changes from tetragonal to pseudo-cubic, with the tetragonality / decreases from 1.011 to 1.008 and XRD peaks broadened. The combined study of XRD and TEM image revealed a formation of core-shell structure in grains with core of 400-600 nm and the shell of a thickness 60-200 nm. There is a slowly phase transition against temperature from the variable temperature Raman analysis. The ferroelectric relaxor peak of BT-NBT decreases from 4000 to ~2000 and a new broad dielectric peak with an equivalent maximum ('2300) appears in the temperature dependent dielectric constant curve ('-), which produces a flat '- curve. Sample 0.92BaTiO-0.08(NaBi)TiO-0.015YbO-0.005 MgO and 0.92BaTiO-0.08(NaBi)TiO-0.015YbO-0.01MgO give a ' variation within ±14% and ±10% in 20-165 °C. The core-shell microstructure should take account for the flattened '- behavior of these samples.

摘要

研究了掺杂量(x = 0.0 - 0.025)的(0.015YbO - MgO)掺杂的(0.92BaTiO - 0.08(NaBi)TiO)陶瓷的介电性能和结构。当(YbO - MgO)添加到(BT - NBT)中时，相从四方相转变为伪立方相，四方度(c/a)从(1.011)降至(1.008)，XRD峰变宽。XRD和TEM图像的联合研究表明，晶粒中形成了核壳结构，核直径为(400 - 600)纳米，壳厚度为(60 - 200)纳米。变温拉曼分析表明，存在缓慢的温度诱导相变。BT - NBT的铁电弛豫峰从约(4000)降至约(2000)，并且在温度依赖介电常数曲线((\epsilon - T))中出现一个等效最大值((\epsilon_{max} \approx 2300))的新宽介电峰，这产生了一条平坦的(\epsilon - T)曲线。样品(0.92BaTiO - 0.08(NaBi)TiO - 0.015YbO - 0.005MgO)和(0.92BaTiO - 0.08(NaBi)TiO - 0.015YbO - 0.01MgO)在(20 - 165^{\circ}C)范围内的(\epsilon)变化在(\pm14%)和(\pm10%)以内。核壳微观结构应解释这些样品的平坦(\epsilon - T)行为。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/24b8fb41f120/materials-14-06802-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/0a7266b17698/materials-14-06802-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/cd03a3a3fc78/materials-14-06802-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/eb7158ee06dc/materials-14-06802-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/105616ba927e/materials-14-06802-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/24b8fb41f120/materials-14-06802-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/0a7266b17698/materials-14-06802-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/cd03a3a3fc78/materials-14-06802-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/eb7158ee06dc/materials-14-06802-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/105616ba927e/materials-14-06802-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c9b/8618925/24b8fb41f120/materials-14-06802-g005.jpg

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