Growth of SrTiO<sub>3</sub>bulk single crystals using edge-defined film-fed growth and the Czochralski methods

Guguschev, Christo; Galazka, Zbigniew; Kok, Dirk J.; Juda, U.; Kwasniewski, Albert; Uecker, R.

doi:10.1039/c5ce00798d

Cited by 17 publications

(14 citation statements)

References 29 publications

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“…It seems to be more appropriate to use the edge-defined film-fed growth (EFG) method, which is proven to permit excellent control of the growth processes for a variety of materials e.g. for rutile 44 , cerium aluminate 45 , rare-earth orthovanadates 46 , and strontium titanate 31 . For all of these oxides, Czochralski growth was less successful since pronounced growth instabilities occurred.…”

Section: Discussionmentioning

confidence: 99%

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

et al. 2017

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Terbium titanate (Tb 2 Ti 2 O 7 ) is a spin-ice material with remarkable magneto-optical properties. It has a high Verdet constant and is a promising substrate crystal for the epitaxy of quantum materials with the pyrochlore structure. Large single crystals with adequate quality of Tb 2 Ti 2 O 7 or any pyrochlore are not available so far. Here we report the growth of high-quality bulk crystals using the Czochralski method to pull crystals from the melt. Prior work using the automated Czochralski method has suffered from growth instabilities like diameter fluctuation, foot formation and subsequent spiraling shortly after the seeding stage. In this study, the volumes of the crystals were strongly increased to several cubic centimeters by means of manual growth control, leading to crystal diameters up to 40 mm and crystal lengths up to 10 mm. Rocking curve measurements revealed full width at half maximum values between 28 and 40 ′′ for 222 reflections. The specific heat capacity c p was measured between room temperature and 1573 K by dynamic differential scanning calorimetry and shows the typical slow parabolic rise. In contrast, the thermal conductivity κ(T ) shows a minimum near 700 K and increases at higher temperature T . Optical spectroscopy was performed at room temperature from the ultraviolet to the near infrared region, and additionally in the near infrared region up to 1623 K. The optical transmission properties and the crystal color are interpreted to be influenced by partial oxidation of Tb 3+ to Tb 4+ .

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Section: Discussionmentioning

confidence: 99%

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

et al. 2017

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“…To assess the microstructure, energy-dispersive Laue mappings (EDLMs) as detailed by Guguschev et al (2015) were carried out using a Bruker M4 TORNADO spectrometer. For increased counting statistics, three consecutive continuous scans of the 20 mm X-ray excitation focus in a 30 mm grid over the samples were performed.…”

Section: Crystallographic and Spectroscopic Investigationsmentioning

confidence: 99%

Czochralski growth of mixed cubic sesquioxide crystals in the ternary system Lu₂O₃–Sc₂O₃–Y₂O₃

Kränkel

Uvarova

Haurat

et al. 2021

Acta Crystallogr B Struct Sci Cryst Eng Mater

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Cubic rare-earth sesquioxide crystals are strongly demanded host materials for high power lasers, but due to their high melting points investigations on their thermodynamics and the growth of large-size crystals of high optical quality remain a challenge. Detailed thermal investigations of the ternary system Lu2O3–Sc2O3–Y2O3 revealing a large range of compositions with melting temperatures below 2200°C and a minimum of 2053°C for the composition (Sc0.45Y0.55)2O3 are presented. These reduced temperatures enable for the first time the growth of high optical quality mixed sesquioxide crystals with disordered structure by the conventional Czochralski method from iridium crucibles. An (Er0.07Sc0.50Y0.43)2O3 crystal is successfully grown and characterized with respect to its crystallographic properties as well as its composition, thermal conductivity and optical absorption in the 1 µm range.

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“…The electronic and ionic structures were modeled using density functional theory within the local-density approximation 27 (LDA) and projector augmented-wave method 28 as implemented in the VASP code. [29][30][31] The repulsive forces on ions due to the localized positron were taken into account when considering trapped positrons. 22 Positron states and lifetimes were calculated using the LDA correlation potential and enhancement factor.…”

Section: B Theoretical Calculationsmentioning

confidence: 99%

TiSr antisite: An abundant point defect in SrTiO3

Karjalainen

Prozheeva

Makkonen

et al. 2020

Journal of Applied Physics

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We present a systematic study of the positron lifetime as a function of measurement temperature in SrTiO 3 single crystals grown in different conditions and by different synthesis methods. We combine our experimental results with state-of-the-art theoretical calculations of positron annihilation parameters. We find that the essentially omnipresent 180 − 190 ps lifetime component is most likely the Ti Sr antisite defect, possibly coupled with one or more oxygen vacancies, supporting the importance of the Ti Sr antisite related defects in SrTiO 3. 1

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Growth of SrTiO₃bulk single crystals using edge-defined film-fed growth and the Czochralski methods

Cited by 17 publications

References 29 publications

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Czochralski growth of mixed cubic sesquioxide crystals in the ternary system Lu₂O₃–Sc₂O₃–Y₂O₃

TiSr antisite: An abundant point defect in SrTiO3

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Growth of SrTiO3bulk single crystals using edge-defined film-fed growth and the Czochralski methods

Cited by 17 publications

References 29 publications

Crystal growth and characterization of the pyrochlore Tb2Ti2O7

Crystal growth and characterization of the pyrochlore Tb2Ti2O7

Czochralski growth of mixed cubic sesquioxide crystals in the ternary system Lu2O3–Sc2O3–Y2O3

TiSr antisite: An abundant point defect in SrTiO3

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Growth of SrTiO₃bulk single crystals using edge-defined film-fed growth and the Czochralski methods

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Crystal growth and characterization of the pyrochlore Tb₂Ti₂O₇

Czochralski growth of mixed cubic sesquioxide crystals in the ternary system Lu₂O₃–Sc₂O₃–Y₂O₃