Mechanical properties of the hexagonal HoMnO(3) thin films by nanoindentation

NCUIR > Engineering College > Departmant of Mechanical Engineering > journal & Dissertation > Item 987654321/50115

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Title:	Mechanical properties of the hexagonal HoMnO(3) thin films by nanoindentation
Authors:	Yen,CY;Jian,SR;Lai,YS;Yang,PF;Liao,YY;Jang,JSC;Lin,TH;Juang,JY
Contributors:	機械工程學系
Keywords:	SPHERICAL INDENTATION;DEFORMATION;GAN;BEHAVIOR;CRYSTAL;LOAD
Date:	2010
Issue Date:	2012-03-27 17:03:47 (UTC+8)
Publisher:	國立中央大學
Abstract:	The structural and nanomechanical characteristics of the hexagonal HoMnO(3) (HMO) thin films are investigated by means of X-ray diffraction (XRD), atomic force microscopy (AFM) and nanoindentation techniques in this study. The HMO thin films were deposited on YSZ(1 1 1) substrates by pulsed laser deposition (PLD). The XRD results reveal only pure (0 0 0 1)-oriented hexagonal HMO reflections without any discernible traces of impurity or secondary phases. Nanoindentation results exhibit discontinuities in the load-displacement curve (so-called multiple "pop-ins" event) during loading, indicating possible involvement of dislocation activities. No discontinuities were observed on unloading segment of the load-displacement curve. Continuous stiffness measurements (CSM) technique was carried out in the nanoindentation tests to determine the hardness and Young's modulus of the hexagonal HMO thin films. The obtained hardness and Young's modulus of the hexagonal HMO thin films are 14.2 +/- 0.7 GPa and 219.2 +/- 10.6 GPa, respectively with the room-temperature fracture toughness being in the order of 0.4 +/- 0.2 MPa m(1/2). (c) 2010 Elsevier B.V. All rights reserved.
Relation:	JOURNAL OF ALLOYS AND COMPOUNDS
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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