Solid-phase reaction in synthesis of Bi12SiO20 source-rods for single-crystal growth in a floating zone

Fu, Senlin; Ozoe, Hiroyuki

doi:10.1016/0022-3697(95)00317-7

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…Figures 7(a)-(h) are the x-ray diffraction patterns of the powders made of the crystal pieces quenched from the Bi 12 SiO 20 melts at 915, 905, 900, 895, 890, 885, 880 or 870 • C, respectively. The Bi 12 SiO 20 melts were prepared by heating the sintered source rod to 920 • C and kept at 920 • C for 15 min (by using a gas flame) in order to make the reaction 6Bi 2 O 3 +SiO 2 → Bi 12 SiO 20 proceed to completion [21] and then slowly cooling to different temperatures in air. The employed quenching medium is the iced water by adding 1.108% salt (the medium is called 1.108 wt% icesalt water).…”

Section: 12mentioning

confidence: 99%

Solidification characteristics of metastable and stable

Fu¹,

Ozoe²

1996

J. Phys. D: Appl. Phys.

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Solidification characteristics of metastable and stable from melts were systematically investigated by x-ray diffraction, differential thermal analysis and thermogravimetry. The experimental results show that the solidification either of metastable or of stable directly from melts appears to be dependent both on the melt temperature and on the cooling rate. In general, high melt temperatures and high cooling rates tend to solidify metastable . Otherwise, low melt temperatures and low cooling rates tend to solidify stable . To produce stable single-crystal , the melt temperature should be controlled to be less than and the cooling rate near the solidifying temperature should be less than .

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Section: 12mentioning

confidence: 99%

Solidification characteristics of metastable and stable

Fu¹,

Ozoe²

1996

J. Phys. D: Appl. Phys.

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“…Bismuth oxide (Bi 2 O 3 ) of 99.99% purity and titanium oxide (TiO 2 ) of 99.99% purity or Bi 2 O 3 and Bi 12 TiO 20 (γ -BCC structure; the powder was obtained by grinding a crystal grown from a 6Bi 2 O 3 -TiO 2 melt by a FZ method [17]) were thoroughly mixed together in a stoichiometric and various non-stoichiometric ratios. They were mixed with about 5 wt% deionized water at room temperature and then pushed into a cylindrical rod of 6.5 mm (diameter) × 68 mm (length) which was then sintered at 300, 380, 450, 500, 550, 618, 660, 700, 750 or 800 • C for 28 h, or a cylindrical rod of 8.5 mm (diameter) × 68 mm (length) which was then sintered at 838 or 888 • C for 28 h. To avoid damage to the shape of the source rod during the sintering processes (particularly those at over 700 • C), a multi-sintering process [18] was employed before the final sintering process. The source rods sintered at 300-800 • C were directly employed in crystal growth.…”

Section: Methodsmentioning

confidence: 99%

The growth and characterization of single crystals using a floating-zone method

Fu¹,

Ozoe²

1997

J. Phys. D: Appl. Phys.

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Single-crystal rods and fibres of of various sizes oriented along [100] direction were successfully produced by a floating-zone method. Each of these crystals has a purely orthorhombic structure and a clear Curie transition at (with a peak at ). Investigation of the growth characteristics revealed that the vaporization of is dependent on the quality of the source rod, the growth rate and the length of the molten zone. For a source rod of pure , a growth rate of and a sufficiently short molten zone (for example 1.7 - 2.0 mm for growth of a 2.8 - 3.2 mm diameter crystal), a good (transparent, without cracks or inclusions) single crystal can be produced directly from the stoichiometric source rod. Otherwise, a source rod with excess is necessary to compensate for the vaporization of during the growth process. The excess amount of required is dependent on the sintered state of the source rod, the growth rate and the phase structures of the original powders from which the source rod had been pressed. In general, an increase in growth rate or in sintering temperature can decrease the required excess amount of in the source rod. However, the excess amount of required can be dramatically decreased by making the source rod from and .

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“…Laser-heated pedestal growth and optically heated float-zone growth of thin (Ӎ1 × 1 mm in cross section) BSO and BTO crystals were described in [101][102][103][104][105][106]. Maffei et al [107] reported on the float-zone crystal …”

Section: Melt Growth Of Sillenite-type Crystalsmentioning

confidence: 98%

“…A serious problem in float-zone crystal growth is Bi 2 O 3 vaporization and subsequent deposition on the furnace wall, which distorts the symmetry of the thermal field. Fu and Ozoe [105] optimized the synthesis of the material for feed rods, whose quality has a significant effect on the structural perfection of the crystals.…”

Section: Melt Growth Of Sillenite-type Crystalsmentioning

confidence: 99%

Growth of Sillenite-Structure Single Crystals

et al. 2005

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The main processes for preparing bulk single crystals and films of photorefractive and piezoelectric Bi 12 M x O 20 ± δ (M = Group II-VIII elements) sillenite compounds are considered. Experimental data are summarized on the crystal growth of Bi 12 M x O 20 ± δ from the melt and under hydrothermal conditions, and the key morphological features of sillenites are analyzed. Various types of macroscopic growth defects in sillenite-type crystals are described, and their origin is discussed. The compositions of second-phase inclusions in undoped and doped (Group I-VIII elements) Bi 12 SiO 20 , Bi 12 GeO 20 , and Bi 12 TiO 20 single crystals are presented, and the main physicochemical properties of various Bi 12 M x O 20 ± δ crystals are summarized.

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Solid-phase reaction in synthesis of Bi12SiO20 source-rods for single-crystal growth in a floating zone

Cited by 14 publications

References 16 publications

Solidification characteristics of metastable and stable

Solidification characteristics of metastable and stable

The growth and characterization of single crystals using a floating-zone method

Growth of Sillenite-Structure Single Crystals

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