Special Issue "Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth"

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (31 May 2016)

Special Issue Editor

Guest Editor
Dr. Ekaterina Pomjakushina

Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Website | E-Mail
Interests: solid state chemistry; crysatl growth; novel materials

Special Issue Information

Dear Colleagues,

Artificially grown single crystals are very important materials in many applications, and also for research purposes. The Traveling Solvent Floating Zone (TSFZ) Method is a complementary method to other well-known crystal growth techniques, such as Verneuil, Bridgman, Czochralski and direct crystallization from melt/flux. The method is, nowadays, used in combination with optical furnaces in which focused light is used to create narrow zone of the melted material. This technique allows growing big (cm3 –size) single crystals of a wide variety of congruent and incongruent melting complex oxides and non-oxide materials. The method is crucible free, ensuring no contamination by a crucible material. Different gas atmospheres (reducing, oxidizing), elevated pressures, or vacuum can be applied during the growth. Depending on the type of the light source used, one can grow materials with melting point up to 3000 °C. In the last few decades, this method has become very popular in the crystal growth community since the equipment for TSFZ is commercially available and relatively inexpensive. It is a great tool for researchers looking for novel materials with unique magnetic, electrical, and optical properties.

The Special Issue on “Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth” is aiming to present recent advances in this field. We encourage research contributions that cover a broad range of technical and instrumental aspects of Traveling Solvent Floating Zone Method, as well as reports on the crystal growth and crystal characterization of different classes of new materials.

Dr. Ekaterina Pomjakushina
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • crystal growth
  • zone melting
  • floating zone crystallization
  • incongruently melting materials

Published Papers (5 papers)

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Research

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Open AccessArticle Influence of Phase Transformations on Crystal Growth of Stoichiometric Brownmillerite Oxides: Sr2ScGaO5 and Ca2Fe2O5
Crystals 2016, 6(11), 146; doi:10.3390/cryst6110146
Received: 18 October 2016 / Revised: 1 November 2016 / Accepted: 8 November 2016 / Published: 12 November 2016
Cited by 1 | PDF Full-text (9330 KB) | HTML Full-text | XML Full-text
Abstract
High quality stoichiometric brownmillerite-type oxide single crystals have been successfully grown by the floating zone method using a mirror furnace. We report here on the growth conditions and structural characterization of two model compounds: Ca2Fe2O5 and Sr2
[...] Read more.
High quality stoichiometric brownmillerite-type oxide single crystals have been successfully grown by the floating zone method using a mirror furnace. We report here on the growth conditions and structural characterization of two model compounds: Ca2Fe2O5 and Sr2ScGaO5. Both show oxygen deficiency with respect to the average perovskite structure, and are promising candidates for oxygen ion conductivity at moderate temperatures. While Sr2ScGaO5 single crystals were obtained in the cubic oxygen-deficient perovskite structure, Ca2Fe2O5 crystallizes in the brownmillerite framework. Having no cubic parent high temperature counterpart, Ca2Fe2O5 crystals were found to be not twinned. We report on structural characterization of the as-grown single crystals by neutron and X-ray diffraction, as well as scanning electron microscopy (SEM) coupled with EDX (Energy Dispersive X-Ray Spectroscopy) analysis and isotope exchange experiments. Full article
(This article belongs to the Special Issue Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth)
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Figure 1

Open AccessArticle Facet Appearance on the Lateral Face of Sapphire Single-Crystal Fibers during LHPG Growth
Crystals 2016, 6(9), 101; doi:10.3390/cryst6090101
Received: 31 May 2016 / Revised: 26 July 2016 / Accepted: 28 July 2016 / Published: 25 August 2016
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Abstract
Results of the study of the lateral surface of single-crystal (SC) sapphire fibers grown along crystallographic directions [0001] and [112¯0] by the LHPG method are presented. The appearance or absence of faceting of the lateral surface
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Results of the study of the lateral surface of single-crystal (SC) sapphire fibers grown along crystallographic directions [ 0001 ] and [ 11 2 ¯ 0 ] by the LHPG method are presented. The appearance or absence of faceting of the lateral surface of the fibers depending on the growth direction is analyzed. The crystallographic orientation of the facets is investigated. The microstructure of the samples is investigated with the help of an optical microscope and a JSM-5910LV scanning electronic microscope (JEOL). The crystallographic orientations of the facets on the SC sapphire fiber surface are determined by electron backscatter diffraction (EBSD). The seed orientation is studied by means of XRD techniques. Full article
(This article belongs to the Special Issue Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth)
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Open AccessArticle Single Crystal Growth of Pure Co3+ Oxidation State Material LaSrCoO4
Crystals 2016, 6(8), 98; doi:10.3390/cryst6080098
Received: 4 July 2016 / Revised: 12 August 2016 / Accepted: 16 August 2016 / Published: 18 August 2016
Cited by 1 | PDF Full-text (1478 KB) | HTML Full-text | XML Full-text
Abstract
We report on the single crystal growth of the single-layer perovskite cobaltate LaSrCoO4 that was grown by the optical floating zone method using high oxygen pressures. Phase purity and single crystallinity were confirmed by X-ray diffraction techniques. The pure Co3+ oxidation
[...] Read more.
We report on the single crystal growth of the single-layer perovskite cobaltate LaSrCoO4 that was grown by the optical floating zone method using high oxygen pressures. Phase purity and single crystallinity were confirmed by X-ray diffraction techniques. The pure Co3+ oxidation state was confirmed by X-ray absorbtion spectroscopy measurements. A transition to a spin glass state is observed at ∼7 K in magnetic susceptibility and specific heat measurements. Full article
(This article belongs to the Special Issue Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth)
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Review

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Open AccessReview Zirconate Pyrochlore Frustrated Magnets: Crystal Growth by the Floating Zone Technique
Crystals 2016, 6(7), 79; doi:10.3390/cryst6070079
Received: 13 June 2016 / Revised: 29 June 2016 / Accepted: 1 July 2016 / Published: 11 July 2016
Cited by 1 | PDF Full-text (13458 KB) | HTML Full-text | XML Full-text
Abstract
This article reviews recent achievements on the crystal growth of a new series of pyrochlore oxides—lanthanide zirconates, which are frustrated magnets with exotic magnetic properties. Oxides of the type A2B2O7 (where A= Rare Earth, B= Ti,
[...] Read more.
This article reviews recent achievements on the crystal growth of a new series of pyrochlore oxides—lanthanide zirconates, which are frustrated magnets with exotic magnetic properties. Oxides of the type A 2 B 2 O 7 (where A = Rare Earth, B = Ti, Mo) have been successfully synthesised in single crystal form using the floating zone method. The main difficulty of employing this technique for the growth of rare earth zirconium oxides A 2 Zr 2 O 7 arises from the high melting point of these materials. This drawback has been recently overcome by the use of a high power Xenon arc lamp furnace for the growth of single crystals of Pr 2 Zr 2 O 7 . Subsequently, large, high quality single crystals of several members of the zirconate family of pyrochlore oxides A 2 Zr 2 O 7 (with A = La → Gd) have been grown by the floating zone technique. In this work, the authors give an overview of the crystal growth of lanthanide zirconates. The optimum conditions used for the floating zone growth of A 2 Zr 2 O 7 crystals are reported. The characterisation of the crystal boules and their crystal quality is also presented. Full article
(This article belongs to the Special Issue Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth)
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Open AccessReview Floating Zone Growth of Bi2Sr2Ca2Cu3Oy Superconductor
Crystals 2016, 6(5), 62; doi:10.3390/cryst6050062
Received: 15 April 2016 / Accepted: 18 April 2016 / Published: 20 May 2016
Cited by 1 | PDF Full-text (3127 KB) | HTML Full-text | XML Full-text
Abstract
The crystal growth of high-temperature oxide superconductors has been hampered by the complexities of these materials and the lack of knowledge of corresponding phase diagrams. The most common crystal growth technique adopted for these materials is the so-called “Flux” method. This method, however,
[...] Read more.
The crystal growth of high-temperature oxide superconductors has been hampered by the complexities of these materials and the lack of knowledge of corresponding phase diagrams. The most common crystal growth technique adopted for these materials is the so-called “Flux” method. This method, however, suffers from several drawbacks: (i) crystals are often crucible and flux contaminated; (ii) crystals are difficult to detach from solidified melt; and (iii) crystals are rather small. In most cases, these drawbacks can be overcome by the crucible-free floating zone method. Moreover, this technique is suitable for crystal growth of incongruently melting compounds, and has been thus successfully used to make large single crystals of Bi2Sr2Ca2Cu3Oy superconductor. In this review, the authors summarize the published and their own growth efforts as well as detailed characterization of as-grown and post-growth annealed samples. The optimal growth conditions that allowed one to obtain the large-size, almost single phase and homogeneous in composition Bi2Sr2Ca2Cu3Oy single crystals are presented. The effect of long lasting post-growth heat treatment on both crystal quality and superconducting properties has also been demonstrated. Full article
(This article belongs to the Special Issue Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth)
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