Growth of SrxBa1−xNb2O6 single crystal fibers

Yamamoto, Joyce K.; Bhalla, A. S.

doi:10.1016/0025-5408(89)90094-9

Cited by 54 publications

(10 citation statements)

References 8 publications

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“…Hence, such BNN fibers are very practicable for self-doubling micro laser arrangements in the green. FEIGELSON (1988) and YAMAMOTO and BHALLA (1989) reported first LHPG results of incongruent melting Sr x Ba 1-x Nb 2 O 6 (SBN) single crystalline fibers with diameter of 500 µm. No compositional striations were found like in Czochralski crystals.…”

Section: 5 Further Niobatesmentioning

confidence: 99%

Fiber Crystal Growth From the Melt

Rudolph

Fukuda

1999

Cryst. Res. Technol.

128

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Cryst. Res. Technol. 341999 1 3-40The literature on melt growth of single crystalline fibers is reviewed. The paper introduces in the characteristic features and wide field of advanced applications of micro single crystals in elongated form having a small diameter in the region µm -mm. A brief historical survey is given. After that typical melt growth methods for production of fiber crystals are shown -micro zone floating (i.e. LHPG) and pulling from a die (i.e. Stepanow, EFG and micro pulling down techniques). Some selected fundamentals of the fiber growth process are described in detail, like mass and heat balance, capillary stability and segregation behaviour. In the centre of interest is the discussion of growth and analytical results obtained for various materials -oxides, mainly suitable for wave guides, lasers and nonlinear optics (sapphire, YAG, KRS-5, BBO, LiNbO 3 and further niobates etc.), eutectics for composites, semiconductors for fundamental studies, and metals for high-speed filament production. Special measures for fiber cladding, in-situ core doping and periodically ferroelectric domain adjustment are included. For the sake of completeness a look at the modern branch of polycrystalline and amorphous alloy fiber spinning and melt extrusion is taken too. In conclusion, the special suitability of fiber crystal growth for fundamental research is demonstrated.

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Section: 5 Further Niobatesmentioning

confidence: 99%

Fiber Crystal Growth From the Melt

Rudolph

Fukuda

1999

Cryst. Res. Technol.

128

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“…Additional details can be found elsewhere. 13,14 The source rods for LHPG were prepared by a conventional solid state reaction method using reagent grade Nb 2 O 5 , K 2 CO 3 , Na 2 CO 3 , SrCO 3 and BaCO 3 . The mixed powders were milled, calcined, crushed, pressed and sintered.…”

Section: Experiments Proceduresmentioning

confidence: 99%

Single crystal growth and ferroelectric properties of α(Ba1−xSrx)Nb2O6:β(Na1−yKy)NbO3 solid solutions

Jiang

Guo

Bhalla

1998

Journal of Applied Physics

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Articles you may be interested inPhase structure, dielectric properties, and relaxor behavior of ( K 0.5 Na 0.5 ) NbO 3 -( Ba 0.5 Sr 0.5 ) TiO 3 lead-free solid solution for high temperature applications Ferroelectric domain wall relaxation in Ba 0.25 Sr 0.75 Ti O 3 films displaying Curie-Weiss behavior Erratum: "Two distinct dielectric relaxation mechanisms in the low-frequency range in (K 0.50 Na 0.50 ) 2 (Sr 0.75 Ba 0.25 ) Two distinct dielectric relaxation mechanisms in the low-frequency range in (K 0.50 Na 0.50 ) 2 (Sr 0.75 Ba 0.25 ) 4 Nb 10 O 30 ceramicsSingle crystals of quaternary solid solution compositions of A-site filled tungsten bronze-type ␣(Ba 1Ϫx Sr x )Nb 2 O 6 :␤(Na 1Ϫy K y )NbO 3 ͑where ␣:␤ϭ2:1, 9:2, xϭ0.75, 0.60, and yϭ0.50, 0.40, and 0.25͒ have been grown by the laser heated pedestal growth technique, both along the a axis and the c axis. The crystal growth studies, the crystallographic parameter analysis, the dielectric properties as well as the thermal expansion behavior of the as grown single crystals are reported. Compositions with low ratios of Ba and Na in the 2:1 section plane have high polarizability, low dielectric loss, and ferroelectric relaxor characteristics.

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“…X-ray diffraction (XRD) technique was used extensively to characterize the crystallographic phases and to adjust the processing conditions. The laser heated molten zone (LHMZ) growth method has been shown to be a powerful method for rapidly growing small diameter single crystals, particularly oxides of high melting temperature, for both property studies and fiber devices [1][2][3]. The LHMZ equipment used in this investigation consisted of a power source (water cooled, tunable flowing gas CO2 55 W laser), an optical layout, and a growth section.…”

Section: Cryslals Of Complex Oxide Perovskiie Compoundsmentioning

confidence: 99%

“…The mechanism of this type of stabilization is through introducing the compensated cation substitution in the form of [2La 3 …”

Section: Sold Solution Of Ternary and Complex Perovskite Oxidesmentioning

confidence: 99%

Design of Dielectric Substrates for High T_cSuperconductor Films

Bhalla

Guo

1997

Acta Phys. Pol. A

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Investigations on the design and engineering of candidate substrate materials suitable for high T L superconductor thin film deposition and applications have yielded several exciting new hosts such as B a(Mg1/3Ta2/3)O3 ,, Sr(A11 /2 Ta 1 /2 )O3 , and Sr(Αll1/2Νb1/2)O3 . Dielectric properties, thermal expansion coemcients, melting temperatures and growth feasibility were tested for a wide range of substrate materials and solid solutions. These complex perovskite crystals and their associated solid solutions provide new options for ultra low loss, low permittivity substrates with close structural and thermal matching to the YΒa 2 Cu 3 O 7-δ . Several new materials have been tested for high Τc snperconductor film depositions. Α laser heated pedestal growth system has been used as an essential tool in producing single crystals for testing. Development on the predictive capability of the dielectric constant of ionic solids, by improving Shannon's approach, will also be discussed in this paper.PACS numbers: 74.76.Βz, 73.61.Νg IntroductionThe selection of useful substrate materials for the deposition of high Τc superconductors (HTSC) is of prime importance and is subjected to a number of constraints. In several microwave applications of the "ceramic dielectric substrates", important considerations have been given to the (a) materials' thermal properties such as thermal expansion and thermal conductivity, and (b) the electrical characteristics such as low dielectric loss, dielectric constants and dielectric coefficient with temperature. The main heart of the selection criteria are intended for the speed (in MCM devices) and the reduction of thermal effects on the signals. In case of the resonators the values of the constants are adjusted with the size of the required device. If we look for HTSC uses in such applications, the additional requirements from the substrates are demanded. For example, additional crystallographic matching parameters are required to deposit high quality oriented (preferably epitaxial) and hence high Jc high temperature superconducting films on the single crystal substrates. These parameters are summarized in Table I.

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Growth of SrxBa1−xNb2O6 single crystal fibers

Cited by 54 publications

References 8 publications

Fiber Crystal Growth From the Melt

Fiber Crystal Growth From the Melt

Single crystal growth and ferroelectric properties of α(Ba1−xSrx)Nb2O6:β(Na1−yKy)NbO3 solid solutions

Design of Dielectric Substrates for High T_cSuperconductor Films

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Growth of SrxBa1−xNb2O6 single crystal fibers

Cited by 54 publications

References 8 publications

Fiber Crystal Growth From the Melt

Fiber Crystal Growth From the Melt

Single crystal growth and ferroelectric properties of α(Ba1−xSrx)Nb2O6:β(Na1−yKy)NbO3 solid solutions

Design of Dielectric Substrates for High TcSuperconductor Films

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Design of Dielectric Substrates for High T_cSuperconductor Films