Photoacoustic investigations on thermal anisotropy in urea l-malic acid single crystals

A. Deepthy, S. Vanishri, D. Ambika, Sajan D. George, V. P.N. Nampoori, H. L. Bhat, E. de Matos Gomes, M. Belsley

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Laser-induced photoacoustic technique in the closed cell configuration has been employed to study the anisotropy in thermal parameters of urea l-malic acid, a nonlinear optical crystal. Thermal diffusivity values of the specimen along different crystallographic axes are evaluated from the measured amplitude and phase spectra of photoacoustic signal using one-dimensional model of Rosencwaig and Gersho. Thermal conductivity of the crystal along different axes is calculated using the measured thermal diffusivity and specific heat values. The measured thermal parameters are correlated with mechanical hardness as well as the bonding scheme of the crystal. Analyses of the results show that there is considerable anisotropy in heat diffusion parameters along different crystal orientations. Results are explained on the basis of crystallographic structure and the phonon-assisted heat diffusion mechanism in crystals.

Original languageEnglish
Pages (from-to)1641-1648
Number of pages8
JournalMaterials Research Bulletin
Volume43
Issue number7
DOIs
Publication statusPublished - 01-07-2008

Fingerprint

Photoacoustic effect
ureas
Urea
Anisotropy
Single crystals
Crystals
anisotropy
acids
Acids
Thermal diffusivity
single crystals
crystals
thermal diffusivity
heat
Crystal orientation
Specific heat
Thermal conductivity
Hardness
thermal conductivity
hardness

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Deepthy, A. ; Vanishri, S. ; Ambika, D. ; George, Sajan D. ; Nampoori, V. P.N. ; Bhat, H. L. ; de Matos Gomes, E. ; Belsley, M. / Photoacoustic investigations on thermal anisotropy in urea l-malic acid single crystals. In: Materials Research Bulletin. 2008 ; Vol. 43, No. 7. pp. 1641-1648.
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Deepthy, A, Vanishri, S, Ambika, D, George, SD, Nampoori, VPN, Bhat, HL, de Matos Gomes, E & Belsley, M 2008, 'Photoacoustic investigations on thermal anisotropy in urea l-malic acid single crystals', Materials Research Bulletin, vol. 43, no. 7, pp. 1641-1648. https://doi.org/10.1016/j.materresbull.2007.09.008

Photoacoustic investigations on thermal anisotropy in urea l-malic acid single crystals. / Deepthy, A.; Vanishri, S.; Ambika, D.; George, Sajan D.; Nampoori, V. P.N.; Bhat, H. L.; de Matos Gomes, E.; Belsley, M.

In: Materials Research Bulletin, Vol. 43, No. 7, 01.07.2008, p. 1641-1648.

Research output: Contribution to journalArticle

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AU - Deepthy, A.

AU - Vanishri, S.

AU - Ambika, D.

AU - George, Sajan D.

AU - Nampoori, V. P.N.

AU - Bhat, H. L.

AU - de Matos Gomes, E.

AU - Belsley, M.

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AB - Laser-induced photoacoustic technique in the closed cell configuration has been employed to study the anisotropy in thermal parameters of urea l-malic acid, a nonlinear optical crystal. Thermal diffusivity values of the specimen along different crystallographic axes are evaluated from the measured amplitude and phase spectra of photoacoustic signal using one-dimensional model of Rosencwaig and Gersho. Thermal conductivity of the crystal along different axes is calculated using the measured thermal diffusivity and specific heat values. The measured thermal parameters are correlated with mechanical hardness as well as the bonding scheme of the crystal. Analyses of the results show that there is considerable anisotropy in heat diffusion parameters along different crystal orientations. Results are explained on the basis of crystallographic structure and the phonon-assisted heat diffusion mechanism in crystals.

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