Method for phase boundary structure control of laminated materials; destruction process investigations of nanostructured coatings with predetermined phase boundary texture

Piezoelectric Voltage Constant and Sensitivity Enhancements Through Phase Boundary Structure Control of Lead-free (K,Na)NbO3-based ceramics

10.21203/rs.3.rs-1177124/v1 ◽

2021 ◽

Author(s):

Min-Ku Lee ◽

Byung-Hoon Kim ◽

Gyoung-Ja Lee

Keyword(s):

Material Parameter ◽

Perovskite Oxide ◽

Lead Free ◽

Boundary Structure ◽

Voltage Sensitivity ◽

Phase Boundaries ◽

Accelerometer Sensor ◽

Structure Control ◽

Piezoelectric Charge ◽

Piezoelectric Voltage

Abstract The piezoelectric voltage constant (g33) is a material parameter critical to piezoelectric voltage-type sensors for detecting vibrations or strains. Here, we report a lead-free (K,Na)NbO3 (KNN)-based piezoelectric accelerometer with voltage sensitivity enhanced by taking advantage of a high g33. To achieve a high g33, the magnitudes of piezoelectric charge constant d33 and dielectric permittivity er of KNN were best coupled by manipulating the intrinsic polymorphic phase boundaries effectively with the help of Bi-based perovskite oxide additives. For the KNN composition that derives benefit from the combination of er and d33, the value of g33 was found to be 46.9 ´ 10-3 V·m/N, which is significantly higher than those (20 - 30 ´ 10−3 V·m/N) found in well-known polycrystalline lead-based ceramics including commercial Pb(Zr,Ti)O3 (PZT). Finally, the accelerometer sensor prototype built using the modified KNN composition demonstrated higher voltage sensitivity (183 mV/g) when measuring vibrations, showing a 29% increase against the PZT-based sensor (142 mV/g).

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Phase Boundary Structure of LixFePO4 Cathode Material Revealed by Atomic-Resolution Scanning Transmission Electron Microscopy

Chemistry of Materials ◽

10.1021/cm5024986 ◽

2014 ◽

Vol 26 (21) ◽

pp. 6178-6184 ◽

Cited By ~ 21

Author(s):

Akiho Nakamura ◽

Sho Furutsuki ◽

Shin-ichi Nishimura ◽

Tetsuya Tohei ◽

Yukio Sato ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Cathode Material ◽

Phase Boundary ◽

Scanning Transmission Electron Microscopy ◽

Atomic Resolution ◽

Boundary Structure ◽

Scanning Transmission Electron ◽

Transmission Electron ◽

Scanning Transmission

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Phase boundary structure of γ′-particles in Cu-10 at.% Be

Acta Metallurgica et Materialia ◽

10.1016/0956-7151(94)00292-p ◽

1995 ◽

Vol 43 (3) ◽

pp. 1305-1311 ◽

Cited By ~ 5

Author(s):

V. Gröger ◽

P. Fratzl ◽

W. Pahl ◽

O. Paris ◽

G. Bischof ◽

...

Keyword(s):

Phase Boundary ◽

Boundary Structure

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Grain Boundary Structure Control for Intergranular Stress-Corrosion Resistance

MRS Proceedings ◽

10.1557/proc-238-311 ◽

1991 ◽

Vol 238 ◽

Cited By ~ 10

Author(s):

G. Palumbo ◽

P. J. King ◽

P. C. Lichtenberger ◽

K. T. Aust ◽

U. Erb

Keyword(s):

Grain Boundary ◽

Stress Corrosion ◽

Geometric Model ◽

Boundary Structure ◽

Polycrystalline Materials ◽

Intergranular Stress Corrosion ◽

Structure Control ◽

Grain Boundary Structure ◽

Stress Corrosion Resistance ◽

Intergranular Stress Corrosion Cracking

ABSTRACTA geometric model for intergranular stress corrosion cracking (IGSCC) is presented and used to evaluate the influence of grain boundary structure on the IGSCC resistance of polycrystalline materials. Preliminary observations regarding the structure of intergranular fracture paths in Alloy 600 C-ring specimens exposed to high temperature caustic media are noted to be consistent with the general predictions of the proposed geometric model and demonstrate that significant enhancement to bulk IGSCC resistance may be achieved through material processing considerations which result in (1) moderate increases in the frequency of structurally ‘special’ grain boundaries (i.e., interfaces close to low Σ CSL's) and (2) refinement in grain size.

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Three-Dimensional Microstructure Reconstruction and Phase Boundary by Serial Sectioning and Numerical Approach

Materials Science Forum ◽

10.4028/www.scientific.net/msf.899.395 ◽

2017 ◽

Vol 899 ◽

pp. 395-399

Author(s):

Daniele Aparecida Nogueira ◽

Aline Aguiar Lopes ◽

Wesley Luiz Conegundes ◽

Fabiane Roberta Freitas Silva ◽

Daniel Rodrigues ◽

...

Keyword(s):

Heat Treatment ◽

Phase Boundary ◽

Three Dimensional ◽

Numerical Approach ◽

Boundary Structure ◽

Powder Materials ◽

Serial Sectioning ◽

Stainless Steel 316L ◽

Volume Fractions ◽

Morphological Aspects

The microstructure and pores of the consolidated powder materials are important to determine the final properties of the pieces produced. Therefore, the control of their volume fractions and morphologies represent actual technological challenges. Besides the quantification of the phase and pores volume fractions there are important features related with the morphological aspects and the phase boundary structure that reveals the mechanisms of properties improvements, which are crucial for development of materials obtained by powder metallurgy techniques. In this paper, stereological measurements of pores present in the material stainless steel (316L) are obtained by combining serial sectioning technique and optical microscopy (OM). Dilatometric experiments were carried out in order to simulate heat treatment for sintering the material. The 3D microstructures are obtained by images reconstruction using numerical pixels treatment and stereological results of the porosities are presented.

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