High-temperature Raman spectra of KDP:Ni crystal

被引：5

作者：

Pereira, Daniel P. ^{[2
]}

de Oliveira, Paulo C. ^{[1
]}

Remedios, Claudio M. R. ^{[3
]}

Moreira, Sanclayton G. C. ^{[3
]}

de Sousa, Francisco F. ^{[4
]}

Mendes Filho, J. ^{[4
]}

Freire, P. T. C. ^{[4
]}

Melo, F. E. A. ^{[4
]}

机构：

[1] Univ Fed Paraiba, Dept Fis, BR-58051970 Joao Pessoa, Paraiba, Brazil

[2] Inst Fed Educ Ciencia & Tecnol Para, BR-66093020 Belem, Para, Brazil

[3] Fed Univ Para, Fac Fis, BR-60740000 Belem, Para, Brazil

[4] Univ Fed Ceara, Dept Fis, BR-60455900 Fortaleza, Ceara, Brazil

来源：

SOLID STATE COMMUNICATIONS | 2012年 / 152卷 / 12期

关键词：

Ferroelectricity; Crystal structure and symmetry; DIHYDROGEN PHOSPHATE; HABIT MODIFICATION; PHASE-TRANSITIONS; KH2PO4; SCATTERING;

D O I：

10.1016/j.ssc.2012.03.026

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

High-temperature Raman scattering measurements of KDP doped with Ni (1% weight) were performed over the spectral range 50-1200 cm(-1). The X-ray powder diffraction patterns taken at room temperature and analyzed by Rietveld refinement showed that doped samples of KDP:Ni have the same tetragonal structure of a pure KDP crystal, but with a contraction of the crystalline cell. The behavior of the high-temperature Raman spectra indicate that two phase transitions occur, one at 413 K and another one at 443 K. These phase transitions occur at temperatures below the thermal dehydratation point, 488 K. DTA and TGA measurements reveals that KDP:Ni and pure KDP have the same thermal dehydratation temperature. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：1023 / 1026

页数：4

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