Phase transitions and dielectric properties of perovskite-type oxyfluorides (1-x)KNbO3-xKMgF3

被引：2

作者：

Katsumata, Tetsuhiro ^{[1
]}

Sawada, Nobuhiro ^{[1
]}

Kuraya, Ryosuke ^{[1
]}

Hamagaki, Takuma ^{[1
]}

Aimi, Akihisa ^{[2
]}

Mori, Daisuke ^{[3
,4
]}

Inaguma, Yoshiyuki ^{[4
]}

Wang, Ruing Ping ^{[5
]}

机构：

[1] Tokai Univ, Sch Sci, Dept Chem, Kitakaname 4-1-1, Hiratsuka, Kanagawa 2591292, Japan

[2] Tokyo Univ Sci, Fac Sci & Technol, Dept Pure & Appl Chem, 2641 Yamazaki, Noda, Chiba 2788510, Japan

[3] Mie Univ, Dept Chem Mat, 1577 Kurimamachiyacho, Tsu, Mie 5148507, Japan

[4] Gakushuin Univ, Dept Chem, Fac Sci, Toshima Ku, Mejiro 1-5-1, Tokyo 1718588, Japan

[5] Natl Inst Adv Ind & Technol, 1-1-1 Umezono, Tsukuba, Ibaraki 3058568, Japan

来源：

JOURNAL OF FLUORINE CHEMISTRY | 2018年 / 209卷

关键词：

Perovskite; Oxyfluoride; High-pressure synthesis; Phase transition; Dielectric properties; POTASSIUM NIOBATE; HIGH-PRESSURE; BEHAVIOR; TEMPERATURE; CERAMICS; FLUORIDE;

D O I：

10.1016/j.jfluchem.2018.02.010

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

(1-x)KNbO3-xKMgF(3) was synthesized using a sealed silica tube with an oxygen generator (KNMOF-O-2) or a high-pressure and high-temperature apparatus (ICNMOF-hp). The variations in phase transition temperature and dielectric properties were investigated. The temperatures of a tetragonal-to-cubic phase transition and an orthorhombic-to-tetragonal phase transition decreased with x, whereas the temperature of a rhombohedral-to-orthorhombic phase transition increased with it. The temperature variation, however, became constant for x >= 0.05 and did not merge into one. In the temperature dependence of dielectric permittivity for x = 0.05 (KNMOF-hp), a broad maximum was observed in the vicinity of 400 K and its value reached approximately 2200 which is higher than that of a KNbO3 dense ceramic. Considering the variation of phase transition temperatures and dielectric measurements, it is concluded that the relaxor-like behavior was realized for x = 0.05 (KNMOF-hp).

引用

页码：65 / 72

页数：8

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