Experimental and numerical effects of active afterheater addition on the growth of langatate (La3Ga5.5Ta0.5O14) crystals by the Czochralski method. Issue 8 (1st February 2018)

• Record Type: Journal Article
• Authors: Lasloudji, Idir; Mokhtari, Faiza; Nehari, Abdeldjelil; Alombert-Goget, Guillaume; Lebbou, Kheirreddine
• Is Part Of: CrystEngComm. Volume 20:Issue 8(2018)
• Page Start: 1110
• Page End: 1115
• Publication Date: 2018-02-01
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce02032e
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Experimental and numerical study on afterheater addition during Cz growth of LGT which resulted in a defect-free crystal with high stability and reproducibility. Abstract : The Czochralski (Cz) technique under an argon/oxygen atmosphere has been used to grow 35 mm diameter La3 Ga5.5 Ta0.5 O14 langatate (LGT) crystals along the Z -axis. Addition of an afterheater is proposed to improve the growth and crystal properties. Two furnace configurations, without and with an afterheater, are investigated experimentally and numerically. A global model for the entire furnace was used in investigating the mechanism of flow, heat transfer, melt–crystal interface shape and 3-d thermal stress considering the crystal anisotropy. Addition of the afterheater changes considerably the thermal field in the growth atmosphere. A decrease of 56% of the maximum von Mises stress and 30% of the interface convexity are found through the use of the afterheater. Experimentally, a more stable growth has been achieved and this resulted in a good quality crystal.