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Article
Publication date: 2 May 2017

Maruti K. Rendale, S.N. Mathad and Vijaya Puri

The present communication aims to investigate the influence of cobalt substitution on the structural, mechanical and elastic properties of nickel–zinc ferrite thick films…

Abstract

Purpose

The present communication aims to investigate the influence of cobalt substitution on the structural, mechanical and elastic properties of nickel–zinc ferrite thick films. The changes observed in the crystallite size (D), lattice constant (a), texture coefficient [TC(hkl)] and mechanical and elastic properties of the thick films due to cobalt substitution have been reported systematically.

Design/methodology/approach

Ni–Zn ferrites with the stoichiometric formula Ni0.7−xCoxZn0.3Fe2O4 (where, x = 0, 0.04, 0.08, 0.12, 0.16 and 0.20) were synthesized via solution combustion technique using sucrose as the fuel and poly-vinyl-alcohol as the matrix material. The thick films of the ferrites were fabricated on alumina substrates by the screen printing method. The thickness of the films was 25 μm, as measured by the gravimetric method. The thick films were subjected to X-ray diffraction and Fourier transform infrared spectroscopy.

Findings

The detailed study of variation of lattice parameter (a), sintering density, micro-strain and elastic properties with cobalt (Co+2) substituted was carried out. The remarkable increase in lattice parameter (from 8.369 A° to 8.3825 A°), bulk density and average grain size (69-119 nm) with the cobalt content was due to larger ionic radius of Co2+ compared to Ni2+. Texture analysis [TC(hkl)] reveals all thick films have adequate grain growth in the (311) plane direction. The main absorption bands of spinel ferrite have appeared through infrared absorption spectra recorded in the range of 300-700 cm−1.

Originality/value

The variation in stiffness constants (for isotropic material, C11 = C12), longitudinal elastic wave (Vl), transverse elastic wave (Vt), mean elastic velocity (VMean), rigidity modulus (G), Poisson’s ratio(s) and Young’s modulus (E) with cobalt (Co+2) composition has been interpreted in terms of binding forces found.

Details

Microelectronics International, vol. 34 no. 2
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 26 April 2013

S.N. Mathad, R.N. Jadhav and Vijaya Puri

The purpose of this paper was to determine the complex permittivity of bismuth strontium manganites (Bi1−xSrxMnO3) in the 8‐12 GHz range by using perturbation of Ag thick…

Abstract

Purpose

The purpose of this paper was to determine the complex permittivity of bismuth strontium manganites (Bi1−xSrxMnO3) in the 8‐12 GHz range by using perturbation of Ag thick film microstrip ring resonator (MSRR) due to superstrate of both bulk and thick film.

Design/methodology/approach

The BSM ceramics were synthesized by simple low cost solid state reaction method and their fritless thick films were fabricated by screen printing technique on alumina substrate. A comparison has been made between the X band response of Ag thick film microstrip ring resonator due to perturbation of bulk and thick film Bi1−xSrxMnO3 ceramic.

Findings

The bulk and thick film superstrate decreases the resonance frequency of MSRR. In this technique even minor change in the properties of superstrate material changes the MSRR response. Variation of strontium content also influences microwave conductivity and penetration depth of bulk and thick films.

Originality/value

The microwave complex permittivity decreases with increase in Sr content in bismuth manganite and it is higher for bulk as compared to its thick films. The superstrate on Ag thick film microstrip ring resonator is an efficient tool capable of detecting the composition dependent changes in microwave properties of ceramic bulk and thick films.

Details

Microelectronics International, vol. 30 no. 2
Type: Research Article
ISSN: 1356-5362

Keywords

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Article
Publication date: 23 August 2021

Jnaneswar K and M.M. Sulphey

Mental wellbeing brings in multiple benefits to employees and their organizations like better decision-making capacity, greater productivity, resilience and so on. The…

Abstract

Purpose

Mental wellbeing brings in multiple benefits to employees and their organizations like better decision-making capacity, greater productivity, resilience and so on. The purpose of this paper is to examine the relationship of a few antecedents of mental wellbeing like workplace spirituality, mindfulness and self-compassion, using structural equation modeling (SEM).

Design/methodology/approach

Using the convenience sampling method, data were collected from 333 employees of various organizations in India and SEM was performed using the R Program to test the hypotheses.

Findings

Results suggest that mindfulness and self-compassion influenced the mental wellbeing of employees. It was also observed that workplace spirituality has a significant influence on both mindfulness and self-compassion.

Originality/value

An in-depth review of the literature revealed that no previous studies had examined the complex relationship between workplace spirituality, mindfulness, self-compassion and the mental wellbeing of employees. This research suggests that workplace spirituality, mindfulness and self-compassion are important factors that influence employees' mental wellbeing, and it empirically tests this in a developing country context. The present study enriches the literature studies on mental wellbeing, mindfulness, self-compassion and workplace spirituality by integrating “mindfulness to meaning theory”, “socio-emotional selectivity theory”, and “broaden and build theory”.

Details

South Asian Journal of Business Studies, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2398-628X

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Article
Publication date: 8 July 2020

Annette Rosemarie Walker

This article explores Jamaican secondary school principals' use of mindfulness meditation as a spiritual well-being strategy to manage their work-related stress and anxiety.

Abstract

Purpose

This article explores Jamaican secondary school principals' use of mindfulness meditation as a spiritual well-being strategy to manage their work-related stress and anxiety.

Design/methodology/approach

The author used qualitative semi-structured interviews to collect the data from 12 Jamaican secondary school principals working in schools supporting rural, urban and inner-city school communities. Thematic coding of the analyzed data was used to understand how principals deal with their work-related stress and anxiety.

Findings

The findings indicate that Jamaican school principals are experiencing work-related stress and anxiety as a result of work intensification, and use mindfulness meditation/prayer as a spiritual coping strategy. The data indicate that principals' primary source of support is their spiritual belief – faith in God and mindfulness meditation/prayer – when dealing with issues related to well-being.

Originality/value

This article explores the use of mindfulness meditation as a non-secular coping strategy, and focuses on an understudied area of educational administration research: Jamaican school principals' well-being. The findings can help inform future education and health policy around occupational health and well-being for professionals, and lay the foundation for greater studies on principal well-being in Jamaican and the Caribbean more generally.

Details

Journal of Educational Administration, vol. 58 no. 4
Type: Research Article
ISSN: 0957-8234

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