Effect of Fluxing Additive on Sintering Temperature, Microstructure and Properties of BaTiO3

Yaseen Iqbal; Asad Jamal; Riaz Ullah; M. Naeem Khan; Rick Ubic

Effect of Fluxing Additive on Sintering Temperature, Microstructure and Properties of BaTiO₃

Yaseen Iqbal
, Asad Jamal
, Riaz Ullah
, M. Naeem Khan
, Rick Ubic

Micron School of Materials Science and Engineering

University of Peshawar

Research output: Contribution to journal › Article › peer-review

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Abstract

Various fluxing materials are added to technical ceramics in an attempt to lower their sintering temperatures and make their processing economical. The effect of 0·3wt% Li ₂ CO ₃ addition on the phase, microstructure, phase transition temperatures and dielectric properties of BaTiO ₃ was investigated in the present study. The addition of 0·3wt% Li2CO ₃ was observed to lower the optimum sintering temperature by ∼200 ^◦ C with no second phase formation and cause a five-fold reduction in grain size. Rhombohedral-to-orthorhombic and tetragonal-to-cubic phase transitions at the expected temperatures were evident from the Raman spectra, but the orthorhombic-totetragonal phase transition was not clearly discernible. The persistence of various phase(s) at higher temperatures in the flux-added materials indicated that the phase transitions occurred relatively slowly. A decrease in dielectric constant of Li ₂ O-added BaTiO ₃ in comparison to pure BaTiO ₃ may be due to the diminished dielectric polarizability of Li ⁺ in comparison to Ba ²⁺ .

Original language	American English
Journal	Bulletin of Materials Science
State	Published - 1 Jun 2012

Keywords

Raman spectroscopy
dielectric properties
electronic materials
microstructure

EGS Disciplines

Materials Science and Engineering

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Effect of Fluxing Additive on Sintering Temperature MicrostructuFinal published version, 1.09 MBLicense: Unspecified

Cite this

@article{84816477a6384224b1c2fdb328a78d9f,

title = "Effect of Fluxing Additive on Sintering Temperature, Microstructure and Properties of BaTiO3",

abstract = " Various fluxing materials are added to technical ceramics in an attempt to lower their sintering temperatures and make their processing economical. The effect of 0·3wt\% Li 2 CO 3 addition on the phase, microstructure, phase transition temperatures and dielectric properties of BaTiO 3 was investigated in the present study. The addition of 0·3wt\% Li2CO 3 was observed to lower the optimum sintering temperature by ∼200 ◦ C with no second phase formation and cause a five-fold reduction in grain size. Rhombohedral-to-orthorhombic and tetragonal-to-cubic phase transitions at the expected temperatures were evident from the Raman spectra, but the orthorhombic-totetragonal phase transition was not clearly discernible. The persistence of various phase(s) at higher temperatures in the flux-added materials indicated that the phase transitions occurred relatively slowly. A decrease in dielectric constant of Li 2 O-added BaTiO 3 in comparison to pure BaTiO 3 may be due to the diminished dielectric polarizability of Li + in comparison to Ba 2+ .",

keywords = "Raman spectroscopy, dielectric properties, electronic materials, microstructure",

author = "Yaseen Iqbal and Asad Jamal and Riaz Ullah and Khan, \{M. Naeem\} and Rick Ubic",

year = "2012",

month = jun,

day = "1",

language = "American English",

}

TY - JOUR

T1 - Effect of Fluxing Additive on Sintering Temperature, Microstructure and Properties of BaTiO3

AU - Iqbal, Yaseen

AU - Jamal, Asad

AU - Ullah, Riaz

AU - Khan, M. Naeem

AU - Ubic, Rick

PY - 2012/6/1

Y1 - 2012/6/1

N2 - Various fluxing materials are added to technical ceramics in an attempt to lower their sintering temperatures and make their processing economical. The effect of 0·3wt% Li 2 CO 3 addition on the phase, microstructure, phase transition temperatures and dielectric properties of BaTiO 3 was investigated in the present study. The addition of 0·3wt% Li2CO 3 was observed to lower the optimum sintering temperature by ∼200 ◦ C with no second phase formation and cause a five-fold reduction in grain size. Rhombohedral-to-orthorhombic and tetragonal-to-cubic phase transitions at the expected temperatures were evident from the Raman spectra, but the orthorhombic-totetragonal phase transition was not clearly discernible. The persistence of various phase(s) at higher temperatures in the flux-added materials indicated that the phase transitions occurred relatively slowly. A decrease in dielectric constant of Li 2 O-added BaTiO 3 in comparison to pure BaTiO 3 may be due to the diminished dielectric polarizability of Li + in comparison to Ba 2+ .

AB - Various fluxing materials are added to technical ceramics in an attempt to lower their sintering temperatures and make their processing economical. The effect of 0·3wt% Li 2 CO 3 addition on the phase, microstructure, phase transition temperatures and dielectric properties of BaTiO 3 was investigated in the present study. The addition of 0·3wt% Li2CO 3 was observed to lower the optimum sintering temperature by ∼200 ◦ C with no second phase formation and cause a five-fold reduction in grain size. Rhombohedral-to-orthorhombic and tetragonal-to-cubic phase transitions at the expected temperatures were evident from the Raman spectra, but the orthorhombic-totetragonal phase transition was not clearly discernible. The persistence of various phase(s) at higher temperatures in the flux-added materials indicated that the phase transitions occurred relatively slowly. A decrease in dielectric constant of Li 2 O-added BaTiO 3 in comparison to pure BaTiO 3 may be due to the diminished dielectric polarizability of Li + in comparison to Ba 2+ .

KW - Raman spectroscopy

KW - dielectric properties

KW - electronic materials

KW - microstructure

UR - https://scholarworks.boisestate.edu/mse_facpubs/120

M3 - Article

SN - 0250-4707

JO - Bulletin of Materials Science

JF - Bulletin of Materials Science

ER -