The search for materials with strong magnetoelectric coupling has been intense since interesting properties were discovered in the perovskite TbMnO3. Among manganese-based family (RMnO3), magnetic and electric orders coexist orthorhombic phase of distorted TmMnO3. antiferromagnetic induces ferroelectricity, leading to type–II multiferroic behavior. Although temperature-dependent behavior Raman-...

The temperature profile plays an important role in well integrity, flow assurance, and test. Meanwhile, the impact of engineering conditions should not be ignored while calculating profile. Therefore, this study, we established a model to analyze changing law inside production string high-pressure/high-temperature gas (HPHT well). proposed considers friction caused by high rate. variations prop...

We report synthesis and magnetization of MSr2Y1.5Ce0.5Cu2O10 (M/Y-1222) compounds with M = Ru, Mn and Cr by HPHT. They are synthesized at high-pressure of 6 GPa in optimized temperatures of up to 1450 °C, for Ru, Mn and 1550 °C in the case of Cr based Y/1222, for a time duration of three hours for all the samples. All the samples crystallized with tetragonal structure in I4/mmm space group. Few...

As worldwide demand of hydrocarbon is growing fast, the oil and gas companies have been forced to explore reservoirs with more hostile conditions, such as high-pressure, high-temperature conditions. Improved technology, material selection and testing procedures are required to overcome the common problems in these conditions. One of the main phases of well construction is cementing job. Appropr...

Методом рентгенівської дифракції вивчено фазовий склад продуктів HPHT спікання (7,7 ГПа, 1600—2450 °С) систем cBN—TiC—Al, cBN—ZrC—Al та cBN—HfC—Al (об’ємне співвідношення компонентів шихти 60 : 35 5). Встановлено, що твердофазні реакції в цих системах ініціюються за температур баротермічної обробки, вищих 2000 °С, і спричинюють утворення боридів відповідного металу (MeB2) AlN. На основі рентген...