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1. Pressure-stiffened Raman Phonons in Group III Nitrides | |||
G. Ouyang,Sun Changqing,W. G. Zhu | |||
Physics 11 December 2007 | |||
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Abstract:It has long been puzzling regarding the atomistic origin of the pressure-induced Raman phonon stiffening that generally follows a polynomial expression with coefficients needing physical indication. Here we show that an extension of the bond-order-length-strength (BOLS) correlation mechanism to the pressure domain has led to an analytical solution to connect the pressure-induced Raman phonon stiffening directly to the bonding identities of the specimen and the response of the bonding identities to the applied stimulus. It is found that the pressure-induced blue-shift of Raman phonons arises from the bond compression and energy storage exerted by the compressive stress. Agreement between predictions and experimental measurement leads to the detailed form for the polynomial coefficients, which offer an atomic understanding of the physical mechanism of the external pressure induced energy gain, thermally induced bond expansion as well as means of determining the mode atomic cohesive energy in a specimen. | |||
TO cite this article:G. Ouyang,Sun Changqing,W. G. Zhu. Pressure-stiffened Raman Phonons in Group III Nitrides[OL].[11 December 2007] http://en.paper.edu.cn/en_releasepaper/content/16832 |
2. Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3 | |||
Sun Changqing, | |||
Physics 18 July 2005 | |||
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Abstract: SiO2 colloid crystal infilled with BaTiO3 was synthesized by a process of self-assembly in combination of sol-gel technique. It is found that infilling the fully crystallized BaTiO3 into the colloid assembly can enhance the photonic band gap significantly. In the vicinity of the ferroelectric phase transition point of BaTiO3 (100-150oC), the photonic band gap of the assembly exhibits a strong temperature dependence. At the Curie point, the band gap has a 20 nm redshift and the optical transmittance reaches its minimum. Such a temperature-tuning effect in photonic band gap should be of high interest in device application. | |||
TO cite this article:Sun Changqing,. Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3[OL].[18 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2475 |
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