Mechanical and Electrical Properties of La3+ Modified BNKZT Ceramics

Pichitchai Butnoi; Supalak Manotham; Pharatree Jaita; Tawee Tunkasiri

doi:10.4028/www.scientific.net/KEM.798.188

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 798Mechanical and Electrical Properties of La3+...

Mechanical and Electrical Properties of La³⁺ Modified BNKZT Ceramics

Abstract:

In this work, Bi_0.5-xLa_xNa_0.4K_0.1Zr_0.02Ti_0.98O₃ (where x = 0, 0.01, and 0.03 mol%) ceramics were prepared by conventional solid-state sintering method, sintered in air at l125°C for 2 h. The mechanical and electrical properties of the sintered ceramic with different La-doping were investigated. The crystalline structure of all ceramics was assessed by X-ray diffraction (XRD) method. Other physical and mechanical properties, i.e. density, porosity, shrinkage, Vickers (HV) and Knoop hardness (HK), and electrical properties were determined. XRD patterns for all samples exhibited a pure perovskite, where coexistence between tetragonal and rhombohedral phases was observed for some composition. The maximum dielectric constant at room temperature was obtained for x = 0.03 ceramic. In addition, the piezoelectric properties were improved and showed the highest d₃₃, S_max and d^*₃₃ values of 189 pC/N, 0.28% and 560 pm/V, respectively for x = 0.01 composition. Furthermore, the optimum values of hardness were observed at this composition.

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Periodical:

Key Engineering Materials (Volume 798)

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188-193

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.798.188

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Online since:

April 2019

Authors:

Pichitchai Butnoi*, Supalak Manotham, Pharatree Jaita, Tawee Tunkasiri

Keywords:

Electrical Properties, La-Doped, Lead-Free BNKT Ceramics, Mechanical Properties

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