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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Renormalization of the phase transition in lead phosphate, Pb-3(PO4)(2), by high pressure: lattice parameters and spontaneous strain
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Renormalization of the phase transition in lead phosphate, Pb-3(PO4)(2), by high pressure: lattice parameters and spontaneous strain

机译：通过高压使磷酸铅Pb-3（PO4）（2）中的相变重新归一化：晶格参数和自发应变

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摘要

The unit-cell parameters of lead phosphate, Pb-3(PO4)(2), have been measured by single-crystal X-ray diffraction in a diamond-anvil cell under hydrostatic conditions to a maximum pressure of 6 GPa. The compound undergoes an improper ferroelastic phase transition at 1.81 +/- 0.01 GPa at 298 +/- 1 K from a low-pressure monoclinic phase (space group C2/c) to a high-pressure trigonal phase. The space group of the high-pressure phase is R (3) over bar m or R3m and the phase boundary is the same as that crossed at ca 450 K at room pressure. The evolution of the spontaneous strain components arising from the phase transition is linear with pressure, indicating an effective critical exponent for the phase transition of beta = 0.50 +/- 0.03. Thus, the application of pressure strongly renormalizes the effective critical exponent of the order parameter from the value of 0.236 found in high-temperature experiments. [References: 28]
机译：磷酸铅Pb-3（PO4）（2）的晶胞参数已通过单晶X射线衍射在静压条件下，最大压力为6 GPa的金刚石-砧式电池中测量。该化合物在298 +/- 1 K时在1.81 +/- 0.01 GPa处经历了不适当的铁弹性相变，从低压单斜晶相（空间群C2 / c）到高压三角相。高压相的空间群在bar m或R3m上为R（3），并且相边界与在室温下约450 K处的相界相同。由相变引起的自发应变分量的演变与压力成线性关系，这表明有效的临界指数对于β= 0.50 +/- 0.03的相变。因此，压力的施加从高温实验中发现的0.236的值强烈地将阶次参数的有效临界指数归一化。 [参考：28]

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