High-Pressure Synthesis, Crystal Structure, and Phase Stability Relations of a LiNbO3-Type Polar Titanate ZnTiO3 and Its Reinforced Polarity by the Second-Order Jahn–Teller Effect

2013 ◽  
Vol 136 (7) ◽  
pp. 2748-2756 ◽  
Author(s):  
Yoshiyuki Inaguma ◽  
Akihisa Aimi ◽  
Yuichi Shirako ◽  
Daichi Sakurai ◽  
Daisuke Mori ◽  
...  
2003 ◽  
Vol 170 (1) ◽  
pp. 24-29 ◽  
Author(s):  
N.D Zhigadlo ◽  
K Kimoto ◽  
M Isobe ◽  
Y Matsui ◽  
E Takayama-Muromachi

CrystEngComm ◽  
2021 ◽  
Author(s):  
Sergey V. Rashchenko ◽  
Anton Shatskiy ◽  
Mark Ignatov ◽  
Anton V. Arefiev ◽  
Konstantin Litasov

A new non-centrosymmetric K2Ca3(CO3)4 crystal (P212121, a = 7.39134(18) Å, b = 8.8153(2) Å, c = 16.4803(4) Å) was synthesized in multianvil press at a pressure of 3 GPa and...


2018 ◽  
Vol 74 (2) ◽  
pp. 120-124 ◽  
Author(s):  
Daisuke Urushihara ◽  
Toru Asaka ◽  
Koichiro Fukuda ◽  
Hiroya Sakurai

The strontium tungstate compound Sr3W2O9 was prepared by a high-pressure synthesis technique. The crystal structure was determined by single-crystal X-ray diffraction and transmission electron microscopy. The structure was found to be a hettotype structure of the high-pressure phase of Ba3W2O9, which has corner-sharing octahedra with a trigonal symmetry. Sr3W2O9 has a monoclinic unit cell of C2/c symmetry. One characteristic of the structure is the breaking of the threefold rotation symmetry existing in the high-pressure phase of Ba3W2O9. The substitution of Sr at the Ba site results in a significant shortening of the interlayer distances of the [AO3] layers (A = Ba, Sr) and causes a distortion in the crystal structure. In Sr3W2O9, there is an off-centre displacement of W6+ ions in the WO6 octahedra. Such a displacement is also observed in the high-pressure phase of Ba3W2O9.


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