Field-induced effects and ferroelectric critical endpoint in (K0.95Li0.05)(Nb1-x Ta x )O3 single crystals

被引：0

作者：

Iwata, Makoto ^{[1
]}

Tagata, Shouma ^{[1
]}

Koketsu, Tomoya ^{[1
]}

Takikawa, Yoshinori ^{[1
]}

Miyazaki, Hidetoshi ^{[1
]}

Kimura, Koji ^{[1
]}

机构：

[1] Nagoya Inst Technol, Dept Phys Sci & Engn, Nagoya 4668555, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2024年 / 63卷 / 07期

基金：

日本学术振兴会;

关键词：

ferroelectricity; phase transition; critical endpoint; tricritical point; perovskite structure; BRILLOUIN-SCATTERING; PHASE-TRANSITIONS; KTA1-XNBXO3; POLARIZATION; NIOBATE;

D O I：

10.35848/1347-4065/ad6165

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Dielectric permittivities under dc biasing fields in the temperature range between -169 degrees C and 75 degrees C have been investigated in (K0.95Li0.05)(Nb1-xTax)O-3 (KLNT-x, x = 71% and 74%). Field-induced ferroelectric phase transitions in KLNT-x have been clarified in the dc field applied along the [001](c) direction (in the cubic coordinate). The ferroelectric critical endpoints in KLNT-71% and KLNT-74% have been determined to be 43.5 degrees C, 3.0 kV cm(-1), and 30.3 degrees C, 2.0 kV cm(-1), respectively. The tricritical point at which the first-order phase transition changes to the second-order phase transition has been estimated at 10.4 degrees C and x = 77.4% in the temperature-concentration phase diagram. The field-induced phase transitions and dielectric tunabilities have been discussed on the basis of the Landau-type free energy density.

引用

页数：7

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