Structural analysis of lead magnesium niobate using synchrotron powder X-ray diffraction and the Rietveld method

被引：15

作者：

Bhakar, Ashok ^{[1
]}

Pandey, Adityanarayan H. ^{[2
,3
]}

Singh, M. N. ^{[1
]}

Upadhyay, Anuj ^{[1
]}

Sinha, A. K. ^{[1
]}

Gupta, S. M. ^{[2
]}

Ganguli, Tapas ^{[1
]}

机构：

[1] Raja Ramanna Ctr Adv Technol, Indus Synchrotrons Utilizat Div, Indore 452013, Madhya Pradesh, India

[2] Raja Ramanna Ctr Adv Technol, Laser Mat Dev & Devices Div, Indore 452013, Madhya Pradesh, India

[3] Raja Ramanna Ctr Adv Technol, Homi Bhabha Natl Inst, Indore 452013, Madhya Pradesh, India

来源：

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS | 2016年 / 72卷

关键词：

lead magnesium niobate; powder diffraction; Rietveld method; polar nanoregions; relaxor ceramic; DIELECTRIC-PROPERTIES; NEUTRON-DIFFRACTION; CUBIC STRUCTURE; PB ATOM; DISORDER; PHASE; TRANSITION; SCATTERING; CERAMICS;

D O I：

10.1107/S2052520616006508

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The room-temperature synchrotron powder X-ray diffraction pattern of the single phase perovskite lead magnesium niobate (PMN) has shown significant broadening in the q range similar to 5-7 angstrom(-1) compared with standard LaB6 synchrotron powder X-ray diffraction data, taken under similar conditions. This broadening/asymmetry lies mainly towards the lower 2 theta side of the Bragg peaks. Attempts to fit this data with the paraelectric cubic phase (Pm (3) over barm) and the local rhombohedral phase (R3m) corresponding to polar nanoregions (PNRs) are made using the Rietveld method. Rietveld refinements show that neither cubic (Pm (3) over barm) nor rhombohedral (R3m) symmetry can fit this XRD pattern satisfactorily. The two-phase refinement fits the experimental data satisfactorily and suggests that the weight percentage of the PNRs is approximately 12-16% at room temperature. The unit-cell volume of these rhombohedral PNRs is approximately 0.15% larger than that of the unit cell volume of the paraelectric cubic phase.

引用

页码：404 / 409

页数：6

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