本實驗在國家同步輻射研究中心(National Synchrotron Radiation Research Center：NSRRC)的BL01C2實驗站進行，利用X光繞射角度散佈分析（angle-dispersive x-ray diffraction, ADXRD），針對三氧化二鈥粉末進行高壓實驗，研究其在常溫高壓下的相變的情形。
在實驗中，將三氧化二鈥由常壓加壓至23.25 GPa，研究結果顯示三氧化二鈥由立方晶系(Cubic) 轉變成單斜晶系(Monoclinic)的相變起始壓力為5.69 GPa，相變完成的壓力為16.77 GPa，發生相變時，體積約減少6.9 %。
陰陽離子的半徑比和晶體結構有相當密切的關聯，壓力增加(靜水壓)，電子雲受擠壓收縮，離子半徑減小，然而陰陽離子膨脹收縮的比率並不相同，當陰陽離子的半徑比值變化程度過大，晶體結構便會產生相變。本研究實驗結果與前人的研究結果比較，發現陽離子半徑愈小，發生相變需要施加較大的壓力，離子半徑愈小(Lu2O3 < Yb2O3 < Er2O3< Ho2O3)，相變壓力愈高(Lu2O3 > Yb2O3 > Er2O3> Ho2O3)。

Experiment at the national synchrotron radiation research center Research Center, (National Synchrotron Radiation: NSRRC) of BL01C2 Experiment Station, X-ray diffraction angle scatter analysis (angle-dispersive x-ray diffraction, ADXRD)for Ho2O3 powderhigh-pressure experiments to study the situation at room temperature under high pressure phase transitions.

In the experiment, the Ho2O3 oxide from atmospheric pressure to 23.25 GPa, the results show that Ho2O3 by the cubic crystal system (Cubic) phase transition into the monoclinic system (Monoclinic) initial pressure of 5.69 GPa, the phase change of pressure to 16.77 GPa, the phase transition occurs, the volume reduction of approximately 6.9%.

Cation-anion radius and crystal structure closely related, the increase in pressure (hydrostatic pressure), the electron cloud by squeezing the contraction, the ionic radius decreases, however, the ions expansion and contraction rate is not the same when the radius of the cation-anionthan the degree of change is too large, the crystal structure will give rise to phase transitions. In this study, experimental results and previous studies, found that the smaller the cation radius, the phase transition of the need to exert greater pressure, the higher the ionic radius smaller (Lu2O3 <Yb2O3 <of Er2O3 <Ho2O3), the phase transition pressure (Lu2O3 > Yb2O3> Er2O3> Ho2O3).

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