Synthesis of Vanadate Materials BaCo2V2O8, SrMn2V2O8, BaMn2V2O8, and SrCo2V2O

Student: Ryan O’Connor

Mentor: Benjamin White

Abstract

BaCo2V2O8 is a quasi-one dimensional material, and, along with a few other similar materials including SrMn2V2O8 , BaMn2V2O8, and SrCo2V2O8, it provides a platform with which to study magnetic interactions in reduced dimensions. Experimental studies on these materials are only made possible by preparing samples, but they are not easy to synthesize. Most published studies that successfully prepared samples used procedures and equipment that are not available to student researchers at CWU. In this study, we attempted to synthesize BaCo2V2O8, SrMn2V2O8 , BaMn2V2O8, and SrCo2V2O8 using a standard solid state synthesis approach. Our procedure involved weighing out stoichiometric amounts of the chemical compounds necessary to produce 1 gram of the desired compound, mixing the components, and grinding them via mortar and pestle. The resulting powder was reacted in a box furnace and heated at a 930°C for several hours. We reacted the powder four times with several intermediate grindings to promote chemical homogeneity. The resulting powder was then pressed into a pellet using a die kit and hydraulic press so that it could be cut into the appropriate sizes for experiments. Powder x-ray diffraction measurements were performed and analyzed to determine the sample purity and to characterize impurity phases. Using this method, we determined that BaCo2V2O8 and SrMn2V2O8 were successfully synthesized; on the other hand, attempts to synthesize BaMn2V2O8 and SrCo2V2O8 were unsuccessful. Once the laboratory is available for use again, measurements of heat capacity and magnetization will be performed on BaCo2V2O8 and SrMn2V2O8 to study their magnetic states.

Presentation

3 thoughts on “Synthesis of Vanadate Materials BaCo2V2O8, SrMn2V2O8, BaMn2V2O8, and SrCo2V2O”

  1. (Sorry for the late replies)

    To Gail Mackin:

    A calling a material quasi-one dimensional is to say that the crystal structure of said material is extremely anisotropic. What this means is that certain properties of the material, such as heat capacity and magnetization are going to be stronger in one-dimension rather than in multiple dimensions.

    To Dr. Fallscheer:

    From my own observation, the two failed compounds either burned off or vaporized. This is most likely due to either an incorrect temperature for their reaction or a pressure component of the reaction. Much of literature I read while studying these materials, when discussing their methods, often kept the materials under pressure during the reaction. That was one of the things that my research was trying to test. Luckily, the two successful materials don’t seem to absolutely require a pressure aspect, but I think that it is most probable that a pressure component is needed for the other failed materials.

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