High-temperature properties of lithium tetraborate Li2B4O7

被引：47

作者：

Senyshyn, A. ^{[1
,2
]}

Boysen, H. ^{[3
]}

Niewa, R. ^{[4
]}

Banys, J. ^{[5
]}

Kinka, M. ^{[5
]}

Burak, Ya ^{[6
]}

Adamiv, V. ^{[6
]}

Izumi, F. ^{[7
]}

Chumak, I. ^{[8
,9
]}

Fuess, H. ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany

[2] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM I, D-85747 Garching, Germany

[3] Univ Munich, Dept Geo & Umweltwissensch, Sekt Kristallog, D-85747 Munich, Germany

[4] Univ Stuttgart, Inst Anorgan Chem, D-70569 Stuttgart, Germany

[5] Vilnius State Univ, Fac Phys, LT-10222 Vilnius, Lithuania

[6] Inst Phys Opt, UA-79005 Lvov, Ukraine

[7] Natl Inst Mat Sci, Quantum Beam Ctr, Tsukuba, Ibaraki 3050044, Japan

[8] Inst Complex Mat, Leibniz Inst IFW Dresden, D-01171 Dresden, Germany

[9] KIT, IAM, D-76344 Eggenstein Leopoldshafen, Germany

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2012年 / 45卷 / 17期

关键词：

EQUATION-OF-STATE; CRYSTAL-STRUCTURE; SINGLE-CRYSTALS; ULTRAVIOLET APPLICATION; HARMONIC-GENERATION; IONIC-CONDUCTIVITY; RAMAN-SCATTERING; AC CONDUCTANCE; BEHAVIOR; POWDER;

D O I：

10.1088/0022-3727/45/17/175305

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High-temperature coherent neutron powder diffraction experiments were carried out on Li2B4O7 with boron isotope ratio B-11 : B-10 as high as 99.6 : 0.4%. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Anomalies in the thermal expansion of lithium tetraborate were considered in terms of first-order Gruneisen approximation. Extended bond length analysis revealed significant modifications of the boron-oxygen framework which is supplemented by dynamic lithium disorder. Impedance spectroscopy studies revealed a complicated conduction mechanism in single crystalline lithium tetraborate. The lithium diffusion pathway for bulk conductivity along the polar axis was established using both maximum entropy and anharmonic refinement techniques.

引用

页数：15

共 98 条

[1] New ferroelectric inorganic materials predicted in point group 4mm [J].