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Browsing Department of Ceramic Engineering by Author "Dwivedi, A."

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Effect of host on the radiative (upconversion emission) as well as non-radiative relaxation (laser induced optical heating) in Tm3+/Yb3+ co-doped phosphors

Dwivedi, A.; Kumar, D.; Rai, S.B.; Rai, A.K. (Elsevier B.V., 2020-10)

Tm3+/Yb3+ co-doped YVO4 (YVO:Tm, Yb); GdVO4 (GVO:Tm, Yb); Y2O3 (YO:Tm, Yb); Gd2O3 (GdO:Tm, Yb) and CaAl2O4 (CAO:Tm, Yb) phosphor samples have been synthesized using high temperature Solid State Reaction method. X-ray ...
Effect of octahedral tilting on antiferroelectric phase stabilization in (1-x)NaNbO3-xCdTiO3ceramics

Gyan, D.S.; Sharma, P.; Dwivedi, A. (Institute of Physics Publishing, 2020-08-12)

In the present work, a unique case for the stabilization of the antiferroelectric phase in NaNbO3 has been presented, where the desired results were obtained in spite of it defying the set pattern predicted by researchers ...
Effect of Synthesis Techniques on the Optical Properties of Ho 3+ /Yb 3+ Co-doped YVO 4 Phosphor: A Comparative Study

Dwivedi, A.; Rai, E.; Kumar, D.; Rai, S.B. (American Chemical Society, 2019-04-16)

The Ho 3+ /Yb 3+ -codoped YVO 4 phosphors have been synthesized by three different techniques (viz., solution combustion, sol-gel, and solid-state reaction techniques). X-ray diffraction patterns confirm the formation of ...
Enhanced multimodal behaviour of Tm3+/Yb3+ co-doped YTaO4 ceramic material through Bi3+ activation and sensitization: Application as a spectral converter

Roy, A.; Dwivedi, A.; Kumar, D.; Mishra, H.; Rai, S.B. (Elsevier Ltd, 2020-11)

The multimodal [Upconversion (UC), Downshifting (DS) and Quantum cutting (QC)] behaviour of Tm3+/Yb3+ co-doped YTaO4 ceramic material is investigated extensively. The samples are prepared by solid-state reaction method at ...
Enhancement of thermoelectric power factor by inducing octahedral ordering in La2-xSrxCoFe O6 double perovskites

Tanwar, K.; Gyan, D.S.; Bhattacharya, S.; Vitta, S.; Dwivedi, A.; Maiti, T. (American Physical Society, 2019-05-14)

Among the various oxide thermoelectric materials, double perovskites provide more flexibility to maneuver interdependent thermoelectric parameters to achieve enhanced thermoelectric figure of merit (ZT), as octahedral ...
Wide-bandgap lanthanide niobates: Optical properties and applications

Dwivedi, A.; Singh, A.K.; Singh, S.K. (Elsevier Ltd, 2020-11)

Niobate phosphors (ANbO4; A: Y, Gd, La) are fascinating wide-bandgap materials which attracts vast interest and vital applications. These compounds exhibit fergusonite crystal structure and give broad-band self-activated ...

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