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摻雜對鈷錳氧化物陶瓷物理性質之影響 = Doping effect on...

劉元勳

摻雜對鈷錳氧化物陶瓷物理性質之影響 = Doping effect on the physical properties of Co2MnO4 ceramics

Record Type:	Language materials, printed : monographic
Paralel Title:	Doping effect on the physical properties of Co2MnO4 ceramics
Author:	劉元勳,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	2012[民101]
Description:	54面圖，表格 : 30公分;
Subject:	尖晶石氧化物
Subject:	spinel oxide
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/20191070756227306044
Summary:	本研究利用固態反應法(solid-state reaction method)製備Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15)與Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2)兩系列之鈷錳氧化物塊材樣品，並量測其微觀結構、磁性質與電性質，希望藉此能清楚探討鉍和釔摻雜對鈷錳氧化物多鐵性質之影響。樣品之微觀結構是以X-ray繞射分析儀(X-ray diffraction; XRD)進行分析。而樣品之磁性質則利用超導量子干涉儀(Superconducting Quantum Interference Device Magnetometer; SQUID)和振動樣品磁量計(Vibrating-Sample Magnetometer; VSM)來測量。此外，我們還以鐵電材料量測系統來測量樣品的電性質。從XRD之結果得知，Co2-xBixMnO4 (0.0 ≤ x ≤ 0.10) 塊材樣品皆為單一相的正尖晶石結構，且隨著鉍含量增加，樣品的晶格常數亦隨之增長。由磁性質分析發現，Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) 樣品隨著Bi摻雜濃度增加，亞鐵磁性轉變溫度(TC)從 180 K (x = 0) 增加到 187 K (x = 0.15)。但由於Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) 漏電流過大，使得我們無法量測出樣品的鐵電行為。另外，從XRD之結果也發現，Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) 塊材樣品皆為單一相的正尖晶石結構，且隨著釔含量增加，樣品的晶格常數也隨之伸長。由磁性質分析顯示，Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) 樣品隨著Y摻雜濃度漸增，亞鐵磁性轉變溫度(TC)從 180 K (x = 0) 增加到 186 K (x = 0.2)。同時，Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) 樣品在室溫皆具有鐵電性，而且Y的摻雜可以提升樣品的鐵電性質。 In this study, we prepared two series of Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) and Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) bulk samples by solid-state reaction method. Owing to study the doping effect on the multiferroic properties of Bismuth (Bi) or Yttrium (Y) doped Co2MnO4 samples; we measured their microstructure, magnetic and electrical properties.The crystalline structures of samples were examined by x-ray diffraction (XRD). The magnetization measurements were carried out using the Superconducting Quantum Interference Device (SQUID) magnetometer and the Vibrating-Sample Magnetometer (VSM). The polarization measurements were performed using a ferroelectric test system.From the results of XRD patterns of the Co2-xBixMnO4 (0.0 ≤ x ≤ 0.10) samples, all the observed peaks can be indexed in cubic spinel structures. It is clearly evident from the XRD analysis that there is no change in structural symmetry except the small increases in lattice parameter a with Bi substitution. The magnetization M(T) of Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) samples, showing the ferrimagnetic transition temperature (TC) shifts from 180 to 187 K with increasing the Bi-content. However, the measured P-E loops do not saturate in the applied electric field range due to significant electrical leakage at high electric fields.We also observed all Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) samples with cubic spinel structure. The substitution of Co3+ by Y3+ leads to lattice expansion, i.e., lattice constant a increases due to the greater ionic radius of Y3+ than that of Co3+ occupying the octahedral sites. The magnetic characterization indicates that with an increase in the Y-content, the ferrimagnetic transition temperature of Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) increases from 180 to 186 K. Moreover, the P-E measurement was also obtained; the Y-doped Co2MnO4 samples exhibit the distinct ferroelectricity at room temperature. The results above indicate the coexistence of ferroelectric and magnetic properties in Co2-xYxMnO4 (0.0 ≤ x ≤ 0.15), can be eventually utilized for the applications of multiferroic devices.

摻雜對鈷錳氧化物陶瓷物理性質之影響 = Doping effect on the physical properties of Co2MnO4 ceramics
劉, 元勳

摻雜對鈷錳氧化物陶瓷物理性質之影響 = Doping effect on the physical properties of Co2MnO4 ceramics / 劉元勳撰 - [高雄市] : 撰者, 2012[民101]. - 54面 ; 圖，表格 ; 30公分.
參考書目：面43-44.
尖晶石氧化物spinel oxide

摻雜對鈷錳氧化物陶瓷物理性質之影響 = Doping effect on the physical properties of Co2MnO4 ceramics
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330 $a 本研究利用固態反應法(solid-state reaction method)製備Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15)與Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2)兩系列之鈷錳氧化物塊材樣品，並量測其微觀結構、磁性質與電性質，希望藉此能清楚探討鉍和釔摻雜對鈷錳氧化物多鐵性質之影響。樣品之微觀結構是以X-ray繞射分析儀(X-ray diffraction; XRD)進行分析。而樣品之磁性質則利用超導量子干涉儀(Superconducting Quantum Interference Device Magnetometer; SQUID)和振動樣品磁量計(Vibrating-Sample Magnetometer; VSM)來測量。此外，我們還以鐵電材料量測系統來測量樣品的電性質。從XRD之結果得知，Co2-xBixMnO4 (0.0 ≤ x ≤ 0.10) 塊材樣品皆為單一相的正尖晶石結構，且隨著鉍含量增加，樣品的晶格常數亦隨之增長。由磁性質分析發現，Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) 樣品隨著Bi摻雜濃度增加，亞鐵磁性轉變溫度(TC)從 180 K (x = 0) 增加到 187 K (x = 0.15)。但由於Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) 漏電流過大，使得我們無法量測出樣品的鐵電行為。另外，從XRD之結果也發現，Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) 塊材樣品皆為單一相的正尖晶石結構，且隨著釔含量增加，樣品的晶格常數也隨之伸長。由磁性質分析顯示，Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) 樣品隨著Y摻雜濃度漸增，亞鐵磁性轉變溫度(TC)從 180 K (x = 0) 增加到 186 K (x = 0.2)。同時，Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) 樣品在室溫皆具有鐵電性，而且Y的摻雜可以提升樣品的鐵電性質。 In this study, we prepared two series of Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) and Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) bulk samples by solid-state reaction method. Owing to study the doping effect on the multiferroic properties of Bismuth (Bi) or Yttrium (Y) doped Co2MnO4 samples; we measured their microstructure, magnetic and electrical properties.The crystalline structures of samples were examined by x-ray diffraction (XRD). The magnetization measurements were carried out using the Superconducting Quantum Interference Device (SQUID) magnetometer and the Vibrating-Sample Magnetometer (VSM). The polarization measurements were performed using a ferroelectric test system.From the results of XRD patterns of the Co2-xBixMnO4 (0.0 ≤ x ≤ 0.10) samples, all the observed peaks can be indexed in cubic spinel structures. It is clearly evident from the XRD analysis that there is no change in structural symmetry except the small increases in lattice parameter a with Bi substitution. The magnetization M(T) of Co2-xBixMnO4 (0.0 ≤ x ≤ 0.15) samples, showing the ferrimagnetic transition temperature (TC) shifts from 180 to 187 K with increasing the Bi-content. However, the measured P-E loops do not saturate in the applied electric field range due to significant electrical leakage at high electric fields.We also observed all Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) samples with cubic spinel structure. The substitution of Co3+ by Y3+ leads to lattice expansion, i.e., lattice constant a increases due to the greater ionic radius of Y3+ than that of Co3+ occupying the octahedral sites. The magnetic characterization indicates that with an increase in the Y-content, the ferrimagnetic transition temperature of Co2-xYxMnO4 (0.0 ≤ x ≤ 0.2) increases from 180 to 186 K. Moreover, the P-E measurement was also obtained; the Y-doped Co2MnO4 samples exhibit the distinct ferroelectricity at room temperature. The results above indicate the coexistence of ferroelectric and magnetic properties in Co2-xYxMnO4 (0.0 ≤ x ≤ 0.15), can be eventually utilized for the applications of multiferroic devices.
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