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Co-Doping Strategies for Controlling...

Ryu, Gyunghyun.

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Co-Doping Strategies for Controlling Electrical Conduction in Oxide Materials.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Co-Doping Strategies for Controlling Electrical Conduction in Oxide Materials./
Author:	Ryu, Gyunghyun.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	128 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
Contained By:	Dissertations Abstracts International82-10B.
Subject:	Barium. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28392943
ISBN:	9798708709370

Co-Doping Strategies for Controlling Electrical Conduction in Oxide Materials.
Ryu, Gyunghyun.

Co-Doping Strategies for Controlling Electrical Conduction in Oxide Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 128 p.

Source: Dissertations Abstracts International, Volume: 82-10, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2021.

This item must not be sold to any third party vendors.

The objective of this dissertation is to understand the fundamentals of the electrical conduction mechanisms and defect chemistry of two important dielectric materials, BaTiO3 ceramics and wide band gap β-Ga2O3 single crystals, with the goal of identifying co-doping strategies that can limit both electronic and ionic conductivity over large oxygen activity ranges.The conductivity behaviors of several acceptor-doped and (acceptor + donor) co-doped BaTiO3 ceramics are studied as a function of temperature and oxygen partial pressure (pO2). The (Mn +Y) co-doped compositions exhibit the lowest insulating bulk conductivity over a wide range of temperatures in air. Moreover, a pO2-independent bulk conductivity is obtained over the pO2 range 100.68 atm (air) - 10-4 atm across the measurement temperature range of 500 °C to 900 °C. This particular (Mn + Y) co-doped BaTiO3 composition also exhibits no significant time-dependent electrical degradation at 500 °C under 45 V/cm DC electric field. The pO2-independent electrical conductivity is believed to arise from the multivalent nature of Mn.The insulating electrical conductivity of Fe-doped (010) β-Ga2O3 single crystals are similarly studied over a wide range of temperatures and pO2. The oxygen partial pressure (pO2)- invariant electrical conductivity is also observed in this system over the pO2 range of 100.68 atm (air) - 10-4 atm from 600 °C to 800 °C. The charge neutrality equation explains that the pO2- independence of electrical conductivity originates from the low concentration of intrinsic point defects and acceptor (Fe) and donor (Si) mutual compensation, leading to the Fermi level pinning.

ISBN: 9798708709370Subjects--Topical Terms:

3560264
Barium.
Subjects--Index Terms:

Electrical conductivity

Co-Doping Strategies for Controlling Electrical Conduction in Oxide Materials.
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506 $a This item must not be sold to any third party vendors.
520 $a The objective of this dissertation is to understand the fundamentals of the electrical conduction mechanisms and defect chemistry of two important dielectric materials, BaTiO3 ceramics and wide band gap β-Ga2O3 single crystals, with the goal of identifying co-doping strategies that can limit both electronic and ionic conductivity over large oxygen activity ranges.The conductivity behaviors of several acceptor-doped and (acceptor + donor) co-doped BaTiO3 ceramics are studied as a function of temperature and oxygen partial pressure (pO2). The (Mn +Y) co-doped compositions exhibit the lowest insulating bulk conductivity over a wide range of temperatures in air. Moreover, a pO2-independent bulk conductivity is obtained over the pO2 range 100.68 atm (air) - 10-4 atm across the measurement temperature range of 500 °C to 900 °C. This particular (Mn + Y) co-doped BaTiO3 composition also exhibits no significant time-dependent electrical degradation at 500 °C under 45 V/cm DC electric field. The pO2-independent electrical conductivity is believed to arise from the multivalent nature of Mn.The insulating electrical conductivity of Fe-doped (010) β-Ga2O3 single crystals are similarly studied over a wide range of temperatures and pO2. The oxygen partial pressure (pO2)- invariant electrical conductivity is also observed in this system over the pO2 range of 100.68 atm (air) - 10-4 atm from 600 °C to 800 °C. The charge neutrality equation explains that the pO2- independence of electrical conductivity originates from the low concentration of intrinsic point defects and acceptor (Fe) and donor (Si) mutual compensation, leading to the Fermi level pinning.
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