کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1813095 1525250 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes
چکیده انگلیسی

The longitudinal and shear sound velocities in colossal magnetoresistive material La0.67Ca0.33MnO3 sintered at 1100, 1250 and 1350 °C with average grain size 1, 3 and 5 μm, respectively, have been measured from 80 to 300 K using the pulse-echo-overlap method. A pronounced increase in the longitudinal sound velocity was observed in all samples around the insulator–metal transition temperature (TIM∼272 K). XRD patterns showed the orthorhombic structure for all samples. The longitudinal and shear velocities showed the largest hysteresis for the sample with 3 μm grain size. A step-like shear sound velocity anomaly near 120 K during cooling or warming was observed to be dependent on the grain size.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 403, Issues 13–16, 1 July 2008, Pages 2394–2398
نویسندگان
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