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釔錳氧化物奈米顆粒之多鐵性質研究 = Multiferroic prop...

國立高雄大學應用物理學系碩士班

釔錳氧化物奈米顆粒之多鐵性質研究 = Multiferroic properties of YMnO3 nanoparticles

Record Type:	Language materials, printed : monographic
Paralel Title:	Multiferroic properties of YMnO3 nanoparticles
Author:	李偉達,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	民99[2010]
Description:	62面圖，表 : 30公分;
Subject:	釔錳氧化物
Subject:	YMnO3
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/01566861132990512256
Summary:	本研究乃利用固態反應(solid-state reaction)法與溶膠-凝膠(sol-gel)法來製備釔錳氧化物(YMnO3)的塊材及奈米顆粒，並探討論尺寸效應(size effect)對YMnO3 多鐵性質之影響。在本實驗中，我們成功地以固態反應法製備YMnO3塊材及不同粒徑大小(18 ~ 80 nm)的奈米粉末並以X光繞射儀(X-ray diffraction)及穿透式電子顯微鏡(Transmission Electron Microscope, TEM)對樣品進行微觀結構及粒徑大小的分析。接下來為了探討尺寸效應對 YMnO3 磁性質以及電性之影響，我們使用超導量子干涉儀(Superconducting Quantum Interference Device, SQUID)對樣品進行磁性質的分析，而樣品的電性則是利用鐵電材料量測系統及阻抗分析儀(LCR meter)測量之。我們由X-ray 粉末繞射及穿透式電子顯微鏡分析發現：塊材與所有的奈米粉末樣品皆具有純單一相的YMnO3 六方結構，且樣品的粒徑大小會隨著熱處理溫度的提升而增加。特別的是，我們由χ-T 與圖χ-1-T 圖的結果發現，熱處理為850 oC 樣品的居禮-外斯(Curie-Weiss)溫度(θcw)與其反鐵性轉換溫度(TN)分別為-365 K 與82 K。與其它樣品相比較，熱處理為850 oC 樣品也具有最高的反鐵磁轉換溫度。除此之外，由電性量測結果也顯示850 oC 熱處理而成的YMnO3 奈米粉末也具有最大的矯頑電場 (EC：23 kV/cm)與殘留極化量(Pr：0.25μC/cm2)。根據這些實驗結果，我們將在本論文中詳細討論論尺寸效應對YMnO3 多鐵性質之影響。 We prepared a series of YMnO3 bulk and nanoparticles by solid-state reaction method and sol-gel method, and studied the size effects on their multiferroic properties. We successfully synthesized bulk and nanoparticles with different grain sizes (18 ~ 80 nm) by controlling the sintering temperature, and then characterized using various apparatuses to investigated their multiferroic properties. The structural characterization of those samples was studied using the X-ray diffraction (XRD) and transmission electron microscopy (TEM).In order to study the size effects on the magnetic and electric properties of YMnO3 samples, we used superconducting quantum interference device (SQUID), TF test analyzer and LCR meter to analyze their magnetic and electric and dielectric properties. It is found that all samples have the single phase of hexagonal YMnO3 structure. It also shows that magnetic properties are strongly dependent on the grain size. Based on the data of magnetic susceptibility (χ-T), we found that the Curie-Weiss temperature (θcw) and the antiferromagnetic (AFM) transition temperature (TN) of 850 oC-sintered nanopowder are -365 K and 82 K,respectively. Compare to other samples, 850 oC-sintered nanopowder has the highest AFM transition temperature. Otherwise, 850 oC-sintered nanopowder also has thelargest coercive electric field (EC：23 kV/cm) and remnant polarization (Pr：0.25 μC/cm2).

釔錳氧化物奈米顆粒之多鐵性質研究 = Multiferroic properties of YMnO3 nanoparticles
李, 偉達

釔錳氧化物奈米顆粒之多鐵性質研究 = Multiferroic properties of YMnO3 nanoparticles / 李偉達撰 - [高雄市] : 撰者, 民99[2010]. - 62面 ; 圖，表 ; 30公分.
參考書目：面.
釔錳氧化物YMnO3

釔錳氧化物奈米顆粒之多鐵性質研究 = Multiferroic properties of YMnO3 nanoparticles
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330 $a 本研究乃利用固態反應(solid-state reaction)法與溶膠-凝膠(sol-gel)法來製備釔錳氧化物(YMnO3)的塊材及奈米顆粒，並探討論尺寸效應(size effect)對YMnO3 多鐵性質之影響。在本實驗中，我們成功地以固態反應法製備YMnO3塊材及不同粒徑大小(18 ~ 80 nm)的奈米粉末並以X光繞射儀(X-ray diffraction)及穿透式電子顯微鏡(Transmission Electron Microscope, TEM)對樣品進行微觀結構及粒徑大小的分析。接下來為了探討尺寸效應對 YMnO3 磁性質以及電性之影響，我們使用超導量子干涉儀(Superconducting Quantum Interference Device, SQUID)對樣品進行磁性質的分析，而樣品的電性則是利用鐵電材料量測系統及阻抗分析儀(LCR meter)測量之。我們由X-ray 粉末繞射及穿透式電子顯微鏡分析發現：塊材與所有的奈米粉末樣品皆具有純單一相的YMnO3 六方結構，且樣品的粒徑大小會隨著熱處理溫度的提升而增加。特別的是，我們由χ-T 與圖χ-1-T 圖的結果發現，熱處理為850 oC 樣品的居禮-外斯(Curie-Weiss)溫度(θcw)與其反鐵性轉換溫度(TN)分別為-365 K 與82 K。與其它樣品相比較，熱處理為850 oC 樣品也具有最高的反鐵磁轉換溫度。除此之外，由電性量測結果也顯示850 oC 熱處理而成的YMnO3 奈米粉末也具有最大的矯頑電場 (EC：23 kV/cm)與殘留極化量(Pr：0.25μC/cm2)。根據這些實驗結果，我們將在本論文中詳細討論論尺寸效應對YMnO3 多鐵性質之影響。 We prepared a series of YMnO3 bulk and nanoparticles by solid-state reaction method and sol-gel method, and studied the size effects on their multiferroic properties. We successfully synthesized bulk and nanoparticles with different grain sizes (18 ~ 80 nm) by controlling the sintering temperature, and then characterized using various apparatuses to investigated their multiferroic properties. The structural characterization of those samples was studied using the X-ray diffraction (XRD) and transmission electron microscopy (TEM).In order to study the size effects on the magnetic and electric properties of YMnO3 samples, we used superconducting quantum interference device (SQUID), TF test analyzer and LCR meter to analyze their magnetic and electric and dielectric properties. It is found that all samples have the single phase of hexagonal YMnO3 structure. It also shows that magnetic properties are strongly dependent on the grain size. Based on the data of magnetic susceptibility (χ-T), we found that the Curie-Weiss temperature (θcw) and the antiferromagnetic (AFM) transition temperature (TN) of 850 oC-sintered nanopowder are -365 K and 82 K,respectively. Compare to other samples, 850 oC-sintered nanopowder has the highest AFM transition temperature. Otherwise, 850 oC-sintered nanopowder also has thelargest coercive electric field (EC：23 kV/cm) and remnant polarization (Pr：0.25 μC/cm2).
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