Structure-dielectric property relationship for vanadium- and scandium-doped barium strontium titanate

Shaojun Liu; V. Y. Zenou; I. Sus; T. Kotani; M. van Schilfgaarde; Nathan Newman

doi:10.1016/j.actamat.2006.12.006

Structure-dielectric property relationship for vanadium- and scandium-doped barium strontium titanate

Shaojun Liu, V. Y. Zenou, I. Sus, T. Kotani, M. van Schilfgaarde, Nathan Newman

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

27 Scopus citations

Abstract

This paper reports the results of an investigation of the structure-property relationship of vanadium (donor) and scandium (acceptor) doped Ba_0.7Sr_0.3TiO₃. While V doping produces a fully miscible Ba_0.7Sr_0.3Ti_1-xV_xO₃ alloy, Sc doping results in an inhomogeneous microstructure with grains containing a Sc-doped Ba-rich shell and an undoped Sr-rich core. This results from a solution-precipitation process that works in combination with a thermodynamic driving force for the preferential segregation of Sc into Ba-rich regions. The Curie temperature (T_c) of Ba_0.7Sr_0.3TiO₃ decreases with increasing dopant concentration from a T_c of 40 °C for undoped material to 18 °C for 4 mol.% V and 22 °C for 4 mol.% Sc (i.e., Ba_0.7Sr_0.3Ti_0.96V_0.04O₃, Ba_0.7Sr_0.3Ti_0.96Sc_0.04O₃). Sc- and V-doped materials are found to have significantly reduced dielectric constants at their Curie temperature than their undoped counterpart. This is most evident for Sc doping, where a 4 mol.% concentration has a dielectric constant of 1000 at T_c, a factor of 12 times smaller than undoped Ba_0.7Sr_0.3TiO₃.

Original language	English (US)
Pages (from-to)	2647-2657
Number of pages	11
Journal	Acta Materialia
Volume	55
Issue number	8
DOIs	https://doi.org/10.1016/j.actamat.2006.12.006
State	Published - May 2007

Keywords

Core-shell structure
Electroceramics
Ferroelectricity
Local density approximations
Microstructure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2006.12.006

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@article{171abe8289e148178d1f03e2a155426a,

title = "Structure-dielectric property relationship for vanadium- and scandium-doped barium strontium titanate",

abstract = "This paper reports the results of an investigation of the structure-property relationship of vanadium (donor) and scandium (acceptor) doped Ba0.7Sr0.3TiO3. While V doping produces a fully miscible Ba0.7Sr0.3Ti1-xVxO3 alloy, Sc doping results in an inhomogeneous microstructure with grains containing a Sc-doped Ba-rich shell and an undoped Sr-rich core. This results from a solution-precipitation process that works in combination with a thermodynamic driving force for the preferential segregation of Sc into Ba-rich regions. The Curie temperature (Tc) of Ba0.7Sr0.3TiO3 decreases with increasing dopant concentration from a Tc of 40 °C for undoped material to 18 °C for 4 mol.% V and 22 °C for 4 mol.% Sc (i.e., Ba0.7Sr0.3Ti0.96V0.04O3, Ba0.7Sr0.3Ti0.96Sc0.04O3). Sc- and V-doped materials are found to have significantly reduced dielectric constants at their Curie temperature than their undoped counterpart. This is most evident for Sc doping, where a 4 mol.% concentration has a dielectric constant of 1000 at Tc, a factor of 12 times smaller than undoped Ba0.7Sr0.3TiO3.",

keywords = "Core-shell structure, Electroceramics, Ferroelectricity, Local density approximations, Microstructure",

author = "Shaojun Liu and Zenou, {V. Y.} and I. Sus and T. Kotani and {van Schilfgaarde}, M. and Nathan Newman",

note = "Funding Information: The work at ASU was supported by the Office of Naval Research under Contract No. N00014-04-1-0461. The use of facilities in the ASU Center for Solid State Science and in the chemistry department is acknowledged. The authors thank Mike McKelvy and Tim Karcher for DTA measurements. The authors also thank Dr Moore for the assistance of electron microprobe measurement.",

year = "2007",

month = may,

doi = "10.1016/j.actamat.2006.12.006",

language = "English (US)",

volume = "55",

pages = "2647--2657",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "8",

}

TY - JOUR

T1 - Structure-dielectric property relationship for vanadium- and scandium-doped barium strontium titanate

AU - Liu, Shaojun

AU - Zenou, V. Y.

AU - Sus, I.

AU - Kotani, T.

AU - van Schilfgaarde, M.

AU - Newman, Nathan

N1 - Funding Information: The work at ASU was supported by the Office of Naval Research under Contract No. N00014-04-1-0461. The use of facilities in the ASU Center for Solid State Science and in the chemistry department is acknowledged. The authors thank Mike McKelvy and Tim Karcher for DTA measurements. The authors also thank Dr Moore for the assistance of electron microprobe measurement.

PY - 2007/5

Y1 - 2007/5

N2 - This paper reports the results of an investigation of the structure-property relationship of vanadium (donor) and scandium (acceptor) doped Ba0.7Sr0.3TiO3. While V doping produces a fully miscible Ba0.7Sr0.3Ti1-xVxO3 alloy, Sc doping results in an inhomogeneous microstructure with grains containing a Sc-doped Ba-rich shell and an undoped Sr-rich core. This results from a solution-precipitation process that works in combination with a thermodynamic driving force for the preferential segregation of Sc into Ba-rich regions. The Curie temperature (Tc) of Ba0.7Sr0.3TiO3 decreases with increasing dopant concentration from a Tc of 40 °C for undoped material to 18 °C for 4 mol.% V and 22 °C for 4 mol.% Sc (i.e., Ba0.7Sr0.3Ti0.96V0.04O3, Ba0.7Sr0.3Ti0.96Sc0.04O3). Sc- and V-doped materials are found to have significantly reduced dielectric constants at their Curie temperature than their undoped counterpart. This is most evident for Sc doping, where a 4 mol.% concentration has a dielectric constant of 1000 at Tc, a factor of 12 times smaller than undoped Ba0.7Sr0.3TiO3.

AB - This paper reports the results of an investigation of the structure-property relationship of vanadium (donor) and scandium (acceptor) doped Ba0.7Sr0.3TiO3. While V doping produces a fully miscible Ba0.7Sr0.3Ti1-xVxO3 alloy, Sc doping results in an inhomogeneous microstructure with grains containing a Sc-doped Ba-rich shell and an undoped Sr-rich core. This results from a solution-precipitation process that works in combination with a thermodynamic driving force for the preferential segregation of Sc into Ba-rich regions. The Curie temperature (Tc) of Ba0.7Sr0.3TiO3 decreases with increasing dopant concentration from a Tc of 40 °C for undoped material to 18 °C for 4 mol.% V and 22 °C for 4 mol.% Sc (i.e., Ba0.7Sr0.3Ti0.96V0.04O3, Ba0.7Sr0.3Ti0.96Sc0.04O3). Sc- and V-doped materials are found to have significantly reduced dielectric constants at their Curie temperature than their undoped counterpart. This is most evident for Sc doping, where a 4 mol.% concentration has a dielectric constant of 1000 at Tc, a factor of 12 times smaller than undoped Ba0.7Sr0.3TiO3.

KW - Core-shell structure

KW - Electroceramics

KW - Ferroelectricity

KW - Local density approximations

KW - Microstructure

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U2 - 10.1016/j.actamat.2006.12.006

DO - 10.1016/j.actamat.2006.12.006

M3 - Article

AN - SCOPUS:34047146994

SN - 1359-6454

VL - 55

SP - 2647

EP - 2657

JO - Acta Materialia

JF - Acta Materialia

IS - 8

ER -

Structure-dielectric property relationship for vanadium- and scandium-doped barium strontium titanate

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