scholarly journals High-Pressure Synthesis and Structures of Perovskite-Type Oxyfluorides

2018 ◽  
Vol 28 (3) ◽  
pp. 193-205
Author(s):  
Tetsuhiro KATSUMATA ◽  
Yoshiyuki INAGUMA ◽  
Daisuke MORI ◽  
Akihisa AIMI
Keyword(s):  
High Pressure ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
Perovskite Type

Hochdrucksynthese und Strukturverfeinerung von SrVO3, Sr2VO4 und Sr3V2O7 / High-Pressure Synthesis and Structure Refinement of SrVO3, Sr2VO4, and Sr3V2O7

1991 ◽  
Vol 46 (10) ◽  
pp. 1315-1318 ◽  
Author(s):  
Klaus-Jürgen Range ◽  
Franz Rau ◽  
Ulrich Klement
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Crystal Structures ◽  
Structure Refinement ◽  
Type I ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
Perovskite Type ◽  
Type Apparatus

Single crystals of SrVO3, Sr2VO4 and Sr3V2O7 have been obtained by high-pressure reactions in a modified belt-type apparatus. The crystal structures, refined from diffractometer data, are as follows: SrVO3, perovskite type, Pm3̄m, a = 3.8408(3) Å, R = 0.017, Rw = 0.018, composition from occupancy refinement of oxygen positions SrVO2.93(2); Sr2VO4, K2NiF4 type, I 4/mmm, a = 3.837(1), c = 12.569(1) Å, R = 0.014, Rw = 0.017; Sr3V2O7, Sr3Ti2O7 type, I 4/mmm, a = 3.839(1), c = 20.262(2) Å, R = 0.020, Rw = 0.029.

High-pressure synthesis and ferroelectric properties in perovskite-type BiScO3–PbTiO3 solid solution

2004 ◽  
Vol 95 (1) ◽  
pp. 231-235 ◽  
Author(s):  
Yoshiyuki Inaguma ◽  
Atsushi Miyaguchi ◽  
Masashi Yoshida ◽  
Tetsuhiro Katsumata ◽  
Yoshiro Shimojo ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
Ferroelectric Properties ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
Perovskite Type

scholarly journals High-pressure synthesis, structure, phase relation of polar LiNbO3-type ZnTiO3

2014 ◽  
Vol 70 (a1) ◽  
pp. C1348-C1348
Author(s):  
Yoshiyuki Inaguma ◽  
Akihisa Aimi ◽  
Yuichi Shirako ◽  
Daichi Sakurai ◽  
Daisuke Mori ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Spontaneous Polarization ◽  
Second Order ◽  
Type Structure ◽  
First Principles Calculation ◽  
Stable Phase ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
Perovskite Type

Ferroelectricity, piezoelectricity, pyroelectricity, and second-order nonlinear optical behavior are technologically important. Because these properties are attributable to the noncentrosymmetric (NCS) structure[1], the search for materials exhibiting such characteristics must begin with a search of NCS materials. Among them, LiNbO3-type (LN-type) compounds with a chemical formula of ABX3 exhibit NSC structures with hexagonal polar space group R3c whose BX6 octahedra three-dimensionally share their corners the same as perovskite-type compounds[2]. In LN-type compounds, the A cation - B cation repulsion directs the spontaneous polarization along c-axis(Fig. 1). Therefore, we might find attractive functional properties by the selection of constituent ions based on their having a naturally occurring polar LN-type structure attributable to the cation-cation repulsion. With the ideas mentioned above, we have investigated the high-pressure synthesis and characterization of novel LN-type oxides such as ZnSnO3, PbNiO3, CdPbO3 as well as known MnMO3 (M = Ti, Sn). Recently, we have successfully synthesized a polar LN-type titanate ZnTiO3 (LN-ZTO) under high pressure and high temperature [3]. The first principles calculation indicates that LN-ZTO is a meta-stable phase obtained by the transformation in the decompression process from the perovskite-type phase, which is stable at high pressure and high temperature. The Rietveld structural refinement reveals that LN-ZTO exhibits greater intra-distortion of the TiO6 in LN-ZTO than that of the SnO6 in LN-type ZnSnO3 (LN-ZSO). The estimated spontaneous polarization are greater than those of LN-ZSO, which is attributed to the great displacement of Ti along c-axis and the greater Born effective charge of Ti (+6.1) than that of Sn (+4.1). Furthermore, the spontaneous polarization of LN-ZTO is greater than that of LiNbO3, indicating that LN-ZTO, like LiNbO3, is a candidate ferroelectric material with high performance. The second harmonic generation (SHG) response of LN-ZTO is 24 times greater than that of LN-ZSO. The findings indicate that the intra-octahedral distortion, spontaneous polarization, and SHG response are caused by the stabilization of the polar LN-type structure and reinforced by the second-order Jahn-Teller effect attributable to the orbital interaction between oxygen ions and d0 ions such as Ti4+. We also discuss the relationship between the intra-distortion of BO6 and polarity in several LN-type oxides.

Topochemical Synthesis of Perovskite-type CuNb2O6 with Colossal Dielectric Constant

2021 ◽  
Author(s):  
Masayuki Fukuda ◽  
Ikuya Yamada ◽  
Hajime Hojo ◽  
Chihiro Takahashi ◽  
Yuya Yoshida ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Pressure ◽  
Structural Transformation ◽  
High Pressure Synthesis ◽  
Synthesis Techniques ◽  
Post Annealing ◽  
Pressure Synthesis ◽  
Colossal Dielectric Constant ◽  
A Site ◽  
Perovskite Type

A novel A-site deficient quadruple perovskite (Pv) oxide, CuNb2O6, has been successfully obtained by a combination of high-pressure synthesis techniques and topochemical structural transformation. Post-annealing of a high-pressure-synthesized Pv-CuNbO3 above...

High-pressure Synthesis of Perovskite-Type Pb(Zn1/3Nb2/3)O3

1969 ◽  
Vol 52 (9) ◽  
pp. 516-517 ◽  
Author(s):  
YOSHIHIRO MATSUO ◽  
HIROMU SASAKI ◽  
SHIGERU HAYAKAWA ◽  
FUMIKAZU KANAMARU ◽  
MITSUE KOIZUMI
Keyword(s):  
High Pressure ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
Perovskite Type

High pressure synthesis of a quasi-one-dimensional GdFeO3-type perovskite PrCuO3 with nearly divalent Cu ions

2019 ◽  
Vol 55 (61) ◽  
pp. 8931-8934 ◽  
Author(s):  
Masaharu Ito ◽  
Hidefumi Takahashi ◽  
Hideaki Sakai ◽  
Hajime Sagayama ◽  
Yuichi Yamasaki ◽  
...  
Keyword(s):  
High Pressure ◽  
Oxidation State ◽  
Oxygen Annealing ◽  
One Dimensional ◽  
High Pressure Synthesis ◽  
Pressure Oxygen ◽  
High Pressure Oxygen ◽  
Pressure Synthesis ◽  
Perovskite Type ◽  
Cu Ions

A new perovskite-type cuprate PrCuO3 with unusual oxidation state and quasi-one-dimensional Cu–O chains has been synthesized by high-pressure oxygen annealing.

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