Sub-liquidus co-crystallization in the Ln2O3-BaO-CoO system: Growth of large LnBaCo2O5+x (Ln=Eu, Gd, Tb, Dy) single crystals

S. N. Barilo; S. V. Shiryaev; G. L. Bychkov; V. P. Plakhty; A. S. Shestak; A. G. Soldatov; A. Podlesnyak; K. Conder; M. Baran; W. R. Flavell; A. Furrer

doi:10.1016/j.jcrysgro.2004.10.075

Sub-liquidus co-crystallization in the Ln₂O₃-BaO-CoO system: Growth of large LnBaCo₂O_5+x (Ln=Eu, Gd, Tb, Dy) single crystals

S. N. Barilo, S. V. Shiryaev, G. L. Bychkov, V. P. Plakhty, A. S. Shestak, A. G. Soldatov, A. Podlesnyak, K. Conder, M. Baran, W. R. Flavell, A. Furrer

Research output: Contribution to journal › Conference article › peer-review

7 Scopus citations

Abstract

An original approach to flux growth has been developed to provide for the first time large and high-quality single crystals of oxygen deficient LnBaCo₂O_5+δ (Ln=Eu, Gd, Tb, Dy, Tb _0.9Dy_0.1). The data from DTA studies of both the BaO-CoO binary eutectic and temperature of crystal nucleation as well as analysis of more than 100 runs of sub-liquidus co-crystallization allow one to infer the tentative (T-x) phase diagram of a quasi-binary cut in the Ln₂O ₃-BaO-CoO system with the estimated primary crystallization field for the LnBaCo₂O_5+δ (Ln-112) phase. As a result, in successful growth runs several crystals of a parallelepiped shape and up to 120 mm³ in volume were grown. The dependence of the crystal shape on the rare earth ion is discussed. For most flux melts close to the ternary eutectic compositions of the corresponding quasi-binary cuts, co-crystallization of the layered cobaltite phase and a new one of LnBaCo ₄O₇ (Ln-114) was found in a wide range of temperatures. Data on the twinned crystal structure of the optimally oxidized (δ=0.5) orthorhombic Ln-112 crystals and crystal characterization by chemical composition, magnetic susceptibility and resonance photoemission spectroscopy are discussed.

Original language	English
Pages (from-to)	120-127
Number of pages	8
Journal	Journal of Crystal Growth
Volume	275
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jcrysgro.2004.10.075
State	Published - Feb 15 2005
Externally published	Yes

Funding

Financial support by INTAS, Grant # 01-0278, by the Swiss NSF in frame of SCOPES, Grant # 7BYPJ065732, by NATO in the frame of Collaborative Linkage Grant # PST CLG 979369, and by grants # SS-1671.20032 (Russia), BRFFI-RFFI # 04 P-143 (Belarus), and CBN 1 PO3B 038 27 (Poland) is gratefully acknowledged.

Funders	Funder number
BRFFI-RFFI	04 P-143, CBN 1 PO3B 038 27
INTAS	01-0278
Swiss NSF	7BYPJ065732
North Atlantic Treaty Organization	SS-1671.20032, PST CLG 979369

Keywords

A2. Overstoichiometric flux growth
B1. Cobaltites
B2. Magnetic materials

Access to Document

10.1016/j.jcrysgro.2004.10.075

Cite this

Barilo, S. N., Shiryaev, S. V., Bychkov, G. L., Plakhty, V. P., Shestak, A. S., Soldatov, A. G., Podlesnyak, A., Conder, K., Baran, M., Flavell, W. R., & Furrer, A. (2005). Sub-liquidus co-crystallization in the Ln₂O₃-BaO-CoO system: Growth of large LnBaCo₂O_5+x (Ln=Eu, Gd, Tb, Dy) single crystals. Journal of Crystal Growth, 275(1-2), 120-127. https://doi.org/10.1016/j.jcrysgro.2004.10.075

@article{6dbe168f41a747bcbf629d69374c05af,

title = "Sub-liquidus co-crystallization in the Ln2O3-BaO-CoO system: Growth of large LnBaCo2O5+x (Ln=Eu, Gd, Tb, Dy) single crystals",

abstract = "An original approach to flux growth has been developed to provide for the first time large and high-quality single crystals of oxygen deficient LnBaCo2O5+δ (Ln=Eu, Gd, Tb, Dy, Tb 0.9Dy0.1). The data from DTA studies of both the BaO-CoO binary eutectic and temperature of crystal nucleation as well as analysis of more than 100 runs of sub-liquidus co-crystallization allow one to infer the tentative (T-x) phase diagram of a quasi-binary cut in the Ln2O 3-BaO-CoO system with the estimated primary crystallization field for the LnBaCo2O5+δ (Ln-112) phase. As a result, in successful growth runs several crystals of a parallelepiped shape and up to 120 mm3 in volume were grown. The dependence of the crystal shape on the rare earth ion is discussed. For most flux melts close to the ternary eutectic compositions of the corresponding quasi-binary cuts, co-crystallization of the layered cobaltite phase and a new one of LnBaCo 4O7 (Ln-114) was found in a wide range of temperatures. Data on the twinned crystal structure of the optimally oxidized (δ=0.5) orthorhombic Ln-112 crystals and crystal characterization by chemical composition, magnetic susceptibility and resonance photoemission spectroscopy are discussed.",

keywords = "A2. Overstoichiometric flux growth, B1. Cobaltites, B2. Magnetic materials",

author = "Barilo, {S. N.} and Shiryaev, {S. V.} and Bychkov, {G. L.} and Plakhty, {V. P.} and Shestak, {A. S.} and Soldatov, {A. G.} and A. Podlesnyak and K. Conder and M. Baran and Flavell, {W. R.} and A. Furrer",

year = "2005",

month = feb,

day = "15",

doi = "10.1016/j.jcrysgro.2004.10.075",

language = "English",

volume = "275",

pages = "120--127",

journal = "Journal of Crystal Growth",

issn = "0022-0248",

publisher = "Elsevier",

number = "1-2",

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Barilo, SN, Shiryaev, SV, Bychkov, GL, Plakhty, VP, Shestak, AS, Soldatov, AG, Podlesnyak, A, Conder, K, Baran, M, Flavell, WR & Furrer, A 2005, 'Sub-liquidus co-crystallization in the Ln₂O₃-BaO-CoO system: Growth of large LnBaCo₂O_5+x (Ln=Eu, Gd, Tb, Dy) single crystals', Journal of Crystal Growth, vol. 275, no. 1-2, pp. 120-127. https://doi.org/10.1016/j.jcrysgro.2004.10.075

TY - JOUR

T1 - Sub-liquidus co-crystallization in the Ln2O3-BaO-CoO system

T2 - Growth of large LnBaCo2O5+x (Ln=Eu, Gd, Tb, Dy) single crystals

AU - Barilo, S. N.

AU - Shiryaev, S. V.

AU - Bychkov, G. L.

AU - Plakhty, V. P.

AU - Shestak, A. S.

AU - Soldatov, A. G.

AU - Podlesnyak, A.

AU - Conder, K.

AU - Baran, M.

AU - Flavell, W. R.

AU - Furrer, A.

PY - 2005/2/15

Y1 - 2005/2/15

N2 - An original approach to flux growth has been developed to provide for the first time large and high-quality single crystals of oxygen deficient LnBaCo2O5+δ (Ln=Eu, Gd, Tb, Dy, Tb 0.9Dy0.1). The data from DTA studies of both the BaO-CoO binary eutectic and temperature of crystal nucleation as well as analysis of more than 100 runs of sub-liquidus co-crystallization allow one to infer the tentative (T-x) phase diagram of a quasi-binary cut in the Ln2O 3-BaO-CoO system with the estimated primary crystallization field for the LnBaCo2O5+δ (Ln-112) phase. As a result, in successful growth runs several crystals of a parallelepiped shape and up to 120 mm3 in volume were grown. The dependence of the crystal shape on the rare earth ion is discussed. For most flux melts close to the ternary eutectic compositions of the corresponding quasi-binary cuts, co-crystallization of the layered cobaltite phase and a new one of LnBaCo 4O7 (Ln-114) was found in a wide range of temperatures. Data on the twinned crystal structure of the optimally oxidized (δ=0.5) orthorhombic Ln-112 crystals and crystal characterization by chemical composition, magnetic susceptibility and resonance photoemission spectroscopy are discussed.

AB - An original approach to flux growth has been developed to provide for the first time large and high-quality single crystals of oxygen deficient LnBaCo2O5+δ (Ln=Eu, Gd, Tb, Dy, Tb 0.9Dy0.1). The data from DTA studies of both the BaO-CoO binary eutectic and temperature of crystal nucleation as well as analysis of more than 100 runs of sub-liquidus co-crystallization allow one to infer the tentative (T-x) phase diagram of a quasi-binary cut in the Ln2O 3-BaO-CoO system with the estimated primary crystallization field for the LnBaCo2O5+δ (Ln-112) phase. As a result, in successful growth runs several crystals of a parallelepiped shape and up to 120 mm3 in volume were grown. The dependence of the crystal shape on the rare earth ion is discussed. For most flux melts close to the ternary eutectic compositions of the corresponding quasi-binary cuts, co-crystallization of the layered cobaltite phase and a new one of LnBaCo 4O7 (Ln-114) was found in a wide range of temperatures. Data on the twinned crystal structure of the optimally oxidized (δ=0.5) orthorhombic Ln-112 crystals and crystal characterization by chemical composition, magnetic susceptibility and resonance photoemission spectroscopy are discussed.

KW - A2. Overstoichiometric flux growth

KW - B1. Cobaltites

KW - B2. Magnetic materials

UR - http://www.scopus.com/inward/record.url?scp=20144370032&partnerID=8YFLogxK

U2 - 10.1016/j.jcrysgro.2004.10.075

DO - 10.1016/j.jcrysgro.2004.10.075

M3 - Conference article

AN - SCOPUS:20144370032

SN - 0022-0248

VL - 275

SP - 120

EP - 127

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

IS - 1-2

ER -