Showing papers on "Perovskite (structure) published in 1971"
TL;DR: More than fifty ferroelectrics belong to the Bi4Ti3O12 family, and all consist of Bi2O2 layers interleaved with perovskite-like Mn−1RnO3n+1 layers.
566 citations
TL;DR: In this article, the atomic positions of Ferroelectric BiFeO 3 were determined using both X-ray single crystal and neutron powder diffraction using the multiple film technique using a Weissenberg camera.
450 citations
TL;DR: In this paper, a series of new high pressure garnets containing sodium and/or titanium was synthesized at a pressure of 250-300 kb of the majorite, previously found to occur as a shock produced phase in a chondritic meteorite.
205 citations
TL;DR: In this paper, the performance of perovskite-type oxide solid solutions was examined under various conditions to attempt to apply them to the solid electrolyte for high temperature fuel cells operative at 800 ∼ 1000°C.
199 citations
TL;DR: The structure of the atmospheric pressure form of SrIrO3 is shown to be a monoclinic distortion of the hexagonal BaTiO3 structure (a = 5.604 A, b = 9.618 A, c = 14.17 A, β = 93.26°) as mentioned in this paper.
162 citations
TL;DR: In this article, the authors investigated the range in which a perovskite phase can exist with A-site and B-site vacancies within the ternary system PbO - La 2 O 3 - TiO 2 by means of X-ray diffraction measurements electron microprobe analysis, chemical analysis, and microscopic analysis.
62 citations
TL;DR: In this article, a perovskite type Mn 2+ V 4+ O 3 was synthesized at high pressures and high temperatures. But the authors only studied the magnetic and electric properties of both MnVO 3 I and II.
55 citations
43 citations
40 citations
01 Jan 1971
35 citations
TL;DR: A perovskite-type oxyfluoride, KTiO 2 F, was prepared by the direct reaction of KF with TiO 2 under high pressure as discussed by the authors.
TL;DR: The bulk magnetic properties of the cubic perovskite material, EuLiH 3, have been investigated and the results strongly suggest that it is a ferromagnet with T c = 38°K and θ c = +40°K as mentioned in this paper.
TL;DR: In this article, the internal magnetic field of the antiferromagnetic solutions in the rhombohedral phase between x=0.7 and x=1.0 was analyzed.
Abstract: The Mossbauer spectra of the ferroelectric solid solutions (BiFeO3)x(PbTiO3)1−x have been studied as a function of temperature, mainly between room temperature and 600°C, using 57Fe in the solutions as an absorber. The quadrupole splitting increased and the isomer shift decreased between x=0.05 and x=0.70, a range in which the solutions are tetragonal and paramagnetic, and in which the unit cell volume increases with increasing x. The isomer shift, in particular, was primarily determined by the unit cell volume. Data are presented on the internal magnetic field of the antiferromagnetic solutions in the rhombohedral phase between x=0.7 and x=1.0. The results demonstrate the similarity and continuity in internal structure between the ferroelectrics PbTiO3 and BiFeO3.
TL;DR: In this article, the i.r. spectra of some cubic perovskite fluorides of formulae KMF3(M = Mg, Mn, Fe, Co, Ni, and Zn) and RbMF3 (M = Mn, Co and Zns) have been recorded in the region 40-600 cm-1; from the observed frequencies, a set of five force constants have been calculated.
Abstract: The i.r. spectra of some cubic perovskite fluorides of formulae KMF3(M = Mg, Mn, Fe, Co, Ni, and Zn) and RbMF3(M = Mn, Co, and Zn) have been recorded in the region 40–600 cm–1; from the observed frequencies, a set of five force constants have been calculated. The i.r. spectrum of KMnF3 recorded at liquid-nitrogen temperature is discussed in terms of the reported structural change from a cubic to an orthorhombic or tetragonal phase which occurs at 184 K. The i.r. spectra of the orthorhombic perovskite fluorides NaMF3(M = Mg, Mn, Co, Ni, and Zn) are reported from 40 to 600 cm–1 and the number of observed bands is in good agreement with the predictions of Factor Group Analysis.
TL;DR: In this article, the phase equilibrium diagrams of CaMgSi2O6-CaTiAl 2O6 with 10, 20, and 30 wt % Ca2Mg Si2O7 in the join CaTiAl2O2-SiO6 were determined and six three-phase, six four-phase and two five-phase assemblages were confirmed.
Abstract: The phase equilibrium diagrams of CaMgSi2O6-CaTiAl2O6 with 10, 20, and 30 wt % Ca2MgSi2O7 in the join CaMgSi2O6-Ca2MgSi2O7-CaTiAl2O6 were determined. Six three-phase assemblages, six four-phase assemblages, and two five-phase assemblages (isobaric trivariant, divariant, and univariant) were confirmed. The univariant assemblages are diopsidess+forsterite+akermanitess + perovskite + liquid and diopsidess+akermanitess+perovskite+spinel + liquid. Because of the complex solid solutions of diopside and akermanite the crystallization ceases before invariant assemblages are reached and the final phase assemblage in the diopside-rich region is diopsidess+akermanitess+perovskite, in the diopside-poor region diopsidess+akermanitess+perovskite + spinel. Two invariant points, diopsidess+forsterite+akermanitess+perovskite+spinel+liquid and diopsidess+akermanitess+anorthite+perovskite+spinel+liquid in the silica-poor region of the system CaO-MgO-Al2O3-TiO2-SiO2 are estimated. The diopside solid solution in this join is discussed with its bearing on the natural titanpyroxenes from alkalic rocks including melilite.
TL;DR: In this article, the authors give a qualitative interpratation in terms of local distortion arising from the disordered distribution of the Ta, x Fe and (1- x )Cr ions.
Abstract: Sr(FeTa) 1/2 O 3 is a disordered perovskite, tetragonal at room temperature, while Sr(CrTa) 1/2 O 3 is an ordered perovskite, cubic at room temperature. These compounds make solid solutions in the whole range of composition. Tetragonal-cubic transition occurs at about 90 mol% of Sr(FeTa) 1/2 O 3 . Intensity of superstructure line of X-ray diffraction which shows the ordered arrangement of the B ions decreases gradually with increase of Sr(FeTa) 1/2 O 3 . Isomer shift is nearly constant, 0.64 mm/sec, for all compounds, the value of which is reasonable for Fe 3+ . The curve of the quadrupole splitting vs composition is rather complicated. We can give it a qualitative interpratation in terms of local distortion arising from the disordered distribution of the Ta, x Fe and (1- x )Cr ions.
Patent•
03 Feb 1971TL;DR: In this paper, the authors present a method of synthesizing the MINERAL PEROVSKITE from LIME and TITANIA, and the Product THEREOF EXHIBITING UNIQUE PIGMENT AND RADIATION OPACIFYING CHARACTERISTICS.
Abstract: HYDROTHERMAL METHOD OF SYNTHESIZING THE MINERAL PEROVSKITE FROM LIME AND TITANIA, AND THE PRODUCT THEREOF EXHIBITING UNIQUE PIGMENT AND RADIATION OPACIFYING CHARACTERISTICS.
TL;DR: In this article, the liquidus temperatures of compositions in the plane CaO·Nb 2 O 5 -CaO·SiO 2 -TiO 2 have been determined using the customary quench technique as well as hotstage microscopy.
Abstract: Liquidus temperatures of compositions in the plane CaO·Nb 2 O 5 -CaO·SiO 2 -TiO 2 have been determined using the customary quench technique as well as hotstage microscopy. The boundaries between the fields of the following compounds have been outlined: TiO 2 (rutile), CaO·TiO 2 ·SiO 2 (sphene), 8CaO·7Nb 2 O 5 ·6TiO 2 , CaO·Nb 2 O 5 , 3CaO·Nb 2 O 5 ·3TiO 2 (pyrochlore), CaO·TiO 2 (perovskite) and CaO·SiO 2 (pseudo-wollastonite). The pyrochlore and perovskite fields were wedged in between the others and both intersected the CaO·TiO 2 ·SiO 2 -CaO·Nb 2 O 5 join.