Phase separation during the melting of oxide borates LnCa4O(BO3)3 (Ln=Y, Gd)

D. Klimm; S. Ganschow; R. Bertram; J. Doerschel; V. Bermúdez; A. Klos

doi:10.1016/S0025-5408(02)00858-9

Phase separation during the melting of oxide borates LnCa₄O(BO₃)₃ (Ln=Y, Gd)

D. Klimm^*
, S. Ganschow
, R. Bertram
, J. Doerschel
, V. Bermúdez
, A. Klos

^*Corresponding author for this work

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

27 Citations (Scopus)

Abstract

GdCa₄O(BO₃)₃ (GdCOB) and YCa₄O(BO₃)₃ (YCOB) single crystals have been grown from the melt by the Czochralski method. Subsequent DTA analysis of the single crystals showed different behavior for both substances. During the first heating both crystals showed a single sharp melting peak at 1490°C (GdCOB) or at 1504°C (YCOB), respectively. In subsequent heating/cooling runs only GdCOB shows one single peak, whereas YCOB shows five peaks. Moreover, phase separation of the melt can be observed by optical observation and by EDX measurements. This behavior can be explained by a miscibility gap in the YCOB melt. The YCOB crystal is formed from the stoichiometric melt by a monotectic reaction.

Original language	English
Pages (from-to)	1737-1747
Number of pages	11
Journal	Materials Research Bulletin
Volume	37
Issue number	10
DOIs	https://doi.org/10.1016/S0025-5408(02)00858-9
Publication status	Published - 28 Aug 2002
Externally published	Yes

Keywords

A. Oxides
B. Crystal growth
C. Differential scanning calorimetry (DSC)
D. Phase equilibria
D. Thermodynamic properties

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10.1016/S0025-5408(02)00858-9

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title = "Phase separation during the melting of oxide borates LnCa4O(BO3)3 (Ln=Y, Gd)",

abstract = "GdCa4O(BO3)3 (GdCOB) and YCa4O(BO3)3 (YCOB) single crystals have been grown from the melt by the Czochralski method. Subsequent DTA analysis of the single crystals showed different behavior for both substances. During the first heating both crystals showed a single sharp melting peak at 1490°C (GdCOB) or at 1504°C (YCOB), respectively. In subsequent heating/cooling runs only GdCOB shows one single peak, whereas YCOB shows five peaks. Moreover, phase separation of the melt can be observed by optical observation and by EDX measurements. This behavior can be explained by a miscibility gap in the YCOB melt. The YCOB crystal is formed from the stoichiometric melt by a monotectic reaction.",

keywords = "A. Oxides, B. Crystal growth, C. Differential scanning calorimetry (DSC), D. Phase equilibria, D. Thermodynamic properties",

author = "D. Klimm and S. Ganschow and R. Bertram and J. Doerschel and V. Berm{\'u}dez and A. Klos",

year = "2002",

month = aug,

day = "28",

doi = "10.1016/S0025-5408(02)00858-9",

language = "English",

volume = "37",

pages = "1737--1747",

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T1 - Phase separation during the melting of oxide borates LnCa4O(BO3)3 (Ln=Y, Gd)

AU - Klimm, D.

AU - Ganschow, S.

AU - Bertram, R.

AU - Doerschel, J.

AU - Bermúdez, V.

AU - Klos, A.

PY - 2002/8/28

Y1 - 2002/8/28

N2 - GdCa4O(BO3)3 (GdCOB) and YCa4O(BO3)3 (YCOB) single crystals have been grown from the melt by the Czochralski method. Subsequent DTA analysis of the single crystals showed different behavior for both substances. During the first heating both crystals showed a single sharp melting peak at 1490°C (GdCOB) or at 1504°C (YCOB), respectively. In subsequent heating/cooling runs only GdCOB shows one single peak, whereas YCOB shows five peaks. Moreover, phase separation of the melt can be observed by optical observation and by EDX measurements. This behavior can be explained by a miscibility gap in the YCOB melt. The YCOB crystal is formed from the stoichiometric melt by a monotectic reaction.

AB - GdCa4O(BO3)3 (GdCOB) and YCa4O(BO3)3 (YCOB) single crystals have been grown from the melt by the Czochralski method. Subsequent DTA analysis of the single crystals showed different behavior for both substances. During the first heating both crystals showed a single sharp melting peak at 1490°C (GdCOB) or at 1504°C (YCOB), respectively. In subsequent heating/cooling runs only GdCOB shows one single peak, whereas YCOB shows five peaks. Moreover, phase separation of the melt can be observed by optical observation and by EDX measurements. This behavior can be explained by a miscibility gap in the YCOB melt. The YCOB crystal is formed from the stoichiometric melt by a monotectic reaction.

KW - A. Oxides

KW - B. Crystal growth

KW - C. Differential scanning calorimetry (DSC)

KW - D. Phase equilibria

KW - D. Thermodynamic properties

UR - https://www.scopus.com/pages/publications/0037190188

U2 - 10.1016/S0025-5408(02)00858-9

DO - 10.1016/S0025-5408(02)00858-9

M3 - Article

AN - SCOPUS:0037190188

SN - 0025-5408

VL - 37

SP - 1737

EP - 1747

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 10

ER -

Phase separation during the melting of oxide borates LnCa₄O(BO₃)₃ (Ln=Y, Gd)

Abstract

Keywords

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