Alkali-lithium modification on rare-earth-neodymium-doped barium strontium sodium niobate ceramics for dielectric and pyroelectric properties

Autor:	P. Viswarupachary, Koduri Ramam, K. Chandramouli
Rok vydání:	2009
Předmět:	Materials science Mechanical Engineering Metals and Alloys Analytical chemistry Mineralogy chemistry.chemical_element Barium Dielectric Alkali metal Neodymium Pyroelectricity chemistry Mechanics of Materials X-ray crystallography Materials Chemistry Lithium Orthorhombic crystal system
Zdroj:	Journal of Alloys and Compounds. 479:574-578
ISSN:	0925-8388
Popis:	The influence of alkali-Li + modification on rare-earth Nd 3+ -doped BSNN tungsten bronze system and its effect on phase formation, dielectric and pyroelectric properties is reported. The structure of Ba 1.45 Sr 2.4 Nd 0.1 Li x Na 2− x Nb 10 O 30 ceramics is comprehensively studied in the range of x = 0.0 ≤ x ≤ 1.0. X-ray diffraction studies indicated single orthorhombic ( mm2 ) phase supported by tolerance factor and average electronegativity difference of BSNLNN compositions. The average particle size was maximum (406 A) at Li 0.6. The dielectric properties are maximum ( ɛ RT = 649 and e T c = 1254 ) at 1 kHz for Li 0.6. The values of T c for Li-modified and Nd-doped BSNN varied from 190 °C to 202 °C. The ρ max value in the order of 10 10 Ω cm which is three orders of magnitude larger when compared with the ρ RT . The value of ρ max is 1.05 × 10 10 Ω cm observed at x = 0.2 of BSNLNN ceramics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c921fdcda9d449d033041d935185f990 https://doi.org/10.1016/j.jallcom.2009.01.063 Zobrazit plný text záznamu Full Text from ScienceDirect