کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1492158 | 992371 | 2007 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and distribution of cations in substituted lead phosphate lacunar apatites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Synthesis and distribution of cations in substituted lead phosphate lacunar apatites Synthesis and distribution of cations in substituted lead phosphate lacunar apatites](/preview/png/1492158.png)
چکیده انگلیسی
Synthesis of apatites, Pb7.4Bi0.3Na2.3(PO4)6 (I), Pb7.36Bi0.32Na2.08Li0.24(PO4)6 (II) and Pb5.78Bi0.81Ca0.60Na2.81(PO4)6 (III), with anion vacancy were carried out during solid state reactions. The three compounds of apatite-type structure crystallize in the hexagonal system, space group P63/m. In every compound, a preferential occupation of the (6h) site by Pb and Bi cations is shown revealing the influence of their lone electronic pair. The introduction of calcium increases the quantity of bismuth in these apatites. Alkaline metals occupy mainly the (4f) site. Infrared spectroscopy is correlated to the bonding scheme. A connection between the cations occupying (4f) sites and the c cell parameters is presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 42, Issue 2, 15 February 2007, Pages 299–311
Journal: Materials Research Bulletin - Volume 42, Issue 2, 15 February 2007, Pages 299–311
نویسندگان
Besma Hamdi, Hafed El Feki, Jean-Michel Savariault, Abdelhamid Ben Salah,