Growth and Characterization of LaFeO3 Crystals

2014 ◽  
Vol 602-603 ◽  
pp. 27-31 ◽  
Author(s):  
Wei Liang Liu ◽  
Xiao Jun Zeng ◽  
Shuo Qi Liu ◽  
Yan Feng Zhu ◽  
An Hua Wu
Keyword(s):  
Thermal Conductivity ◽  
Polished Surface ◽  
Floating Zone ◽  
Zone Method ◽  
Rocking Curve ◽  
Floating Zone Method ◽  
X Ray ◽  
Variation Range

The LaFeO3 polycrystalline feed rod was prepared by sintering La2O3 and Fe2O3 powder at 1400 °C for 24 h. The LaFeO3 crystal was grown by the floating zone method. The crystal preferred to crystallize along <100> direction. The X-ray rocking curve of the (100) crystal plane has a FWHM of 26 arcsec, confirming the high crystal quality of the sample. Some voids were observed on the polished surface. The thermal properties of LaFeO3 crystal during 298~773 K were tested. The specific heat of LaFeO3 crystal variation range was 0.58~0.76 J/(g·K), The thermal diffusivity of LaFeO3 crystal variation range was 3.47~0.85 mm2/s, The thermal conductivity of LaFeO3 crystal variation range was 13.10~4.21 W/(m·K).

Characterization of Natural and Synthesized FeTiO3 Crystals With RBS/PIXE/XRD

1997 ◽  
Vol 07 (03n04) ◽  
pp. 265-275
Author(s):  
R. Q. Zhang ◽  
S. Yamamoto ◽  
Z. N. Dai ◽  
K. Narumi ◽  
A. Miyashita ◽  
...  
Keyword(s):  
Single Crystals ◽  
Ion Beam ◽  
Pressure Control ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Beam Analysis ◽  
Ppm Level

Natural FeTiO 3 (illuminate) and synthesized FeTiO 3, single crystals were characterized by Rutherford backscattering spectroscopy combined with channeling technique and particle-induced x-ray emission (RBS-C and PIXE). The results obtained by the ion beam analysis were supplemented by the x-ray diffraction analysis to identify the crystallographic phase. Oriented single crystals of synthesized FeTiO 3 were grown under the pressure control of CO 2 and H 2 mixture gas using a single-crystal floating zone technique. The crystal quality of synthesized FeTiO 3 single crystals could be improved by the thermal treatment but the exact pressure control is needed to avoid the precipitation of Fe 2 O 3 even during the annealing procedure. Natural FeTiO 3 contains several kinds of impurities such as Mn , Mg , Na and Si . The synthesized samples contain Al , Si and Na which are around 100 ppm level as impurities. The PBS-C results of the natural sample imply that Mn impurities occupy the Fe sublattice in FeTiO 3 or in mixed phase between ilmenite and hematite.

scholarly journals Effect of rotation of feed and seed rods on the quality of Na0.75CoO2 single crystal grown by traveling solvent floating zone method

2011 ◽  
Vol 46 (5) ◽  
pp. 675-681 ◽  
Author(s):  
C. Sekar ◽  
S. Paulraj ◽  
P. Kanchana ◽  
B. Schüpp-Niewa ◽  
R. Klingeler ◽  
...  
Keyword(s):  
Single Crystal ◽  
Floating Zone ◽  
Zone Method ◽  
Floating Zone Method

LFZ growth of (Bi, Pb)–Sr–Ca–Cu–O superconducting fibers

1991 ◽  
Vol 6 (4) ◽  
pp. 699-703 ◽  
Author(s):  
G.F. de la Fuente ◽  
R. Navarro ◽  
F. Lera ◽  
C. Rillo ◽  
J. Bartolomé ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Growth Rates ◽  
Floating Zone ◽  
Partial Pressure Of Oxygen ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Fiber Properties ◽  
Growth Atmosphere

Powder x-ray diffraction, d.c. and a.c. susceptibilities, and SEM have been used to study (Bi1−xPbx)2Sr2Ca2Cu3O10−δ fibers grown by the Laser Floating Zone method. The well-oriented, long-grained superconductor fiber properties are shown to be highly dependent on the partial pressure of oxygen in the growth atmosphere, as well as on fiber pulling rate. Slowly grown fibers contain initially the 2212 (80 K) phase; the 2223 (110 K) phase also appears upon annealing in air. Faster growth rates result in fibers that contain a mixture of the 2212 and 2201 phases and, in this case, long annealing procedures are necessary to observe the 2223 phase.

Crystal growth and structure analysis of Sm2−xCexCuO4

2000 ◽  
Vol 15 (9) ◽  
pp. 1905-1910 ◽  
Author(s):  
H. Takeda ◽  
M. Okuno ◽  
M. Ohgaki ◽  
K. Yamashita ◽  
T. Matsumoto
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Quench Method

The phase diagram of the Sm2O3–CuO system was investigated by the combination of the differential thermal analysis and the quench method. The results showed that Sm2CuO4 incongruently melts at about 1220 °C, and that the solid Sm2CuO4 exists in equilibrium with the liquid consisting of 81–95 mol% CuO in the range of 1060–1220 °C. On the basis of the phase diagram, Sm2−xCexCuO4 single crystals were grown by the traveling solvent floating zone method. The crystal structure [space group I4/mmm, a = 3.917(1), c 4 11.899(2) Å] has been refined using single-crystal x-ray diffraction data with a precision corresponding to an R index of 0.02.

scholarly journals Growth and characterization of Li7La3Zr2O12 single crystals by using floating zone method for use as fast Li-ion conductor†

2021 ◽  
Vol 1718 ◽  
pp. 012012
Author(s):  
Md Abdur Razzaque Sarker ◽  
Satoshi Watauchi ◽  
Mashanori Nagao ◽  
Md Moazzem Hossain ◽  
Isao Tanaka
Keyword(s):  
Single Crystals ◽  
Floating Zone ◽  
Zone Method ◽  
Ion Conductor ◽  
Floating Zone Method ◽  
Li Ion

Magnetic and structural properties of Mg(Ga0.95Fe0.05)2O4 crystal grown by optical floating zone method

2020 ◽  
Vol 34 (23) ◽  
pp. 2050245
Author(s):  
Liang-Ling Wang ◽  
Nian-Qiao Liu ◽  
Xiao-Jun Cui
Keyword(s):  
Quantum Interference ◽  
Magnetic Force ◽  
Magnetic Domain ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Force Microscopy ◽  
Increasing Temperature

The crystal structure and magnetic properties of [Formula: see text] grown by optical floating zone method have been studied. The chemical composition and element ratio in the crystal were analyzed by energy dispersive X-ray spectroscopy (EDS). The results of X-ray diffraction and Raman spectra of the crystal reveal that it has a spinel structure with high crystallinity and purity. The magnetic domain period observed by using magnetic force microscopy (MFM) shows that the crystal has a stable multi-domain structure. According to the superconducting quantum interference device (SQUID) results, the magnetization increases nonlinearly with increasing magnetic field strength and approaches magnetic saturation, proving it is a paramagnetic medium. The magnetization decreases rapidly below Curie temperature and approaches stability with increasing temperature.

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