Understanding gray track formation in KTP: 
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 centers studied from first principles

Bocchini, Adriana; Eigner, Christof; Silberhorn, Christine; Schmidt, Wolf Gero; Gerstmann, Uwe

doi:10.1103/physrevmaterials.4.124402

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…Several experiments have been conducted to investigate and understand the origin of gray tracking [7,[24][25][26]. However, an exact description of the physical mechanism behind gray tracking is still an open question [27][28][29]. In 1992, Loiacono et al [25] observed gray tracking in samples illuminated by monochromatic light at a 530 nm wavelength.…”

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confidence: 99%

DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking

et al. 2022

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We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP) and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method by which to reduce the overall ionic conductivity in KTP by a potassium nitrate treatment. Furthermore, we create so-called gray tracking in KTP and investigate the ionic conductivity in theses areas. A local unintended reduction of the ionic conductivity is observed in the gray-tracked regions, which also induce additional optical absorption in the material. We show that a thermal treatment in an oxygen-rich atmosphere removes the gray tracking and brings the ionic conductivity as well as the optical transmission back to the original level. These studies can help to choose the best material and treatment for specific applications.

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Section: Introductionmentioning

confidence: 99%

DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking

et al. 2022

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Quasiparticle energies and optical response of RbTiOPO₄ and KTiOAsO₄

Neufeld¹,

Schindlmayr²,

Schmidt³

2021

J. Phys. Mater.

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Many-body perturbation theory based on density-functional theory calculations is used to determine the quasiparticle band structures and the dielectric functions of the isomorphic ferroelectrics rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenide (KTiOAsO4). Self-energy corrections of more than 2 eV are found to widen the transport band gaps of both materials considerably to 5.3 and 5.2 eV, respectively. At the same time, both materials are characterized by strong exciton binding energies of 1.4 and 1.5 eV, respectively. The solution of the Bethe–Salpeter equation based on the quasiparticle energies results in onsets of the optical absorption within the range of the measured data.

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Oxygen vacancies in KTiOPO4 : Optical absorption from hybrid DFT

2022

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Understanding gray track formation in KTP: Ti3+ centers studied from first principles

Cited by 4 publications

References 34 publications

DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking

DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking

Quasiparticle energies and optical response of RbTiOPO₄ and KTiOAsO₄

Oxygen vacancies in KTiOPO4 : Optical absorption from hybrid DFT

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Understanding gray track formation in KTP: Ti3+ centers studied from first principles

Cited by 4 publications

References 34 publications

DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking

DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking

Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4

Oxygen vacancies in KTiOPO4 : Optical absorption from hybrid DFT

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Quasiparticle energies and optical response of RbTiOPO₄ and KTiOAsO₄