Start as a top student and move towards the stars and the sea

"Also, I will go back to dormitory 208 often to check. After I am gone, you should continue to study hard and get scholarships as before. After you go to graduate school, you should also publish more papers!"

Ning Chen's words made everyone's sentimental mood subside a lot. Indeed, as long as Ning Chen continues to stay at Shengzhou University, there will still be many opportunities for everyone to meet each other in the future.

"It's enough to get a scholarship, and forget about publishing a paper. It'll be good if I can successfully get my undergraduate degree certificate. I don't want to study for graduate school anymore," Chen Tianpeng said.

Chen Tianpeng is the kind of student who really can't focus on his studies. Ning Chen also feels that Chen Tianpeng is not suitable for scientific research, and it would be a better choice to go back and inherit the family business.

"Hey, Brother Chen, you might as well have gone to graduate school earlier, but the undergraduate stage is no longer suitable for you. After you leave, I finally have the opportunity to get first place in my major."

Yang Yan's words made everyone laugh. It is true that Ning Chen is here, and the others can only compete for second place.

After the four joked for a while, they also talked seriously about some future issues.

"Brother Chen, except for me, everyone in our dormitory wants to develop in the direction of materials in the future. With the current results of Yang Yan and Yuan Shuai, Baoyan should have no problem."

"Ning Chen, if we go to graduate school in the future, you will be our senior. If we go to a laboratory then, you will have to take care of us."

"If we really go to a laboratory, it won't just be a senior, but our senior brother Ning, haha."

Ning Chen felt a little helpless about such a title. We were all roommates before, so how could we soon become senior brothers.

But such a possibility does exist. With the abilities of Yang Yan and Yuan Shuai, if they engage in scientific research, not to mention how great achievements they will make, at least they will definitely be very qualified scientific researchers.

"It's up to you to determine which research direction you want to develop in. Many teachers in our School of Materials are very capable and have their own research areas that they are good at. You can carefully compare them when choosing a mentor."

Teachers like Xu Zhou have more comprehensive research directions, including nanomaterials, metal materials, electrode materials, etc., which are all research directions that Xu Zhou is good at.

Ning Chen still prefers to stay with teachers like Xu Zhou, so that he can try more research fields in the future and reduce many limitations of scientific research.

Before everyone left, Ning Chen also promised to treat everyone to dinner in the future, not because of this breakup, but for the sake of getting together again in the future.

Of course, because Yang Yan, Yuan Shuai, and Chen Tianpeng still have to prepare for the final exam of this semester, the meal time is scheduled after the final exam.

…

After the graduation defense episode, Ning Chen continued to devote his energy to experiments.

After careful analysis and study of the properties of previous products, Ning Chen continued to improve the new iron-based superconducting model he constructed.

"Previously, the ratio of potassium, iron, and selenium was based on the ratio of 0.8, 1.6, and 2. If you want to achieve a true superconducting phase, you need to increase the ratio of iron to more than 1.8. …”

After constant calculations and corrections, Ning Chen finally determined the new element ratio and continued his experiments.

After numerous experiments, Ning Chen successively synthesized two new potassium-iron-selenium system substances.

The synthesis of these two new substances is a good achievement in the field of material synthesis.

What disappointed Ning Chen was that these two substances were still not superconductors, and the problem of Fe vacancies had not been completely solved.

Ning Chen discussed these phenomena with Xu Zhou, and Xu Zhou frowned after listening.

"Ning Chen, there is nothing wrong with your model in theory. You have done so many experiments on material synthesis. If such a substance really existed, it should have been synthesized long ago."

Xuzhou knew that Ning Chen was a very steady and patient person in doing experiments. If Ning Chen couldn't get the ideal result after trying so many times, then it can only be said that the result itself may not be good. exist.

After hearing what Xu Zhou said, Ning Chen also realized that perhaps the model he had built had some problems in itself.

At this time, Xu Zhou changed the topic again.

"Ning Chen, look at the three substances we have synthesized now, which are K2Fe4Se5, K2Fe3Se4, and K2Fe7Se8. According to your ideal superconducting model, in the final superconducting phase, the quantity ratio of the three elements should be 1: 2:2. Can we consider adding material elements directly to these three substances so that their element ratio reaches this ratio?"

Xu Zhou's words suddenly enlightened Ning Chen, as if a light suddenly flashed through Ning Chen's mind.

"That's right...this may be the final answer! Teacher Xu, you are really a genius!"

In excitement, Ning Chen couldn't help shouting at Xu Zhou.

Xu Zhou was startled by Ning Chen's excited look. In fact, Xu Zhou just suddenly thought of this direction and was not sure whether this method would really work.

Ning Chen also realized that he was a little too excited, but after all, he had failed so many times before and finally thought of a new promising idea. It was normal for him to lose control of his emotions.

"Mr. Xu, I think it is very likely that, as you said, this kind of superconducting material cannot be synthesized directly at high temperatures, but can only exist in the form of a phase. Blindly pursuing the synthesis of this kind of material may be a Wrong direction."

Ning Chen felt that the three substances he had synthesized before might be superconducting matrices that did not have superconductivity. But as long as the appropriate proportion of elements is added, under low temperature and current, the excess elements can fill the Fe vacancies, thereby achieving superconducting properties.

Xu Zhou could see that Ning Chen was indeed very confident in his model, and this confidence was based on Ning Chen's strong professional ability.

"Well, Ning Chen, then go ahead and try to measure it. If I really guess it right, wouldn't it be too much to treat me to a meal?"

Ning Chenxin said that if this was really the case, buying a meal would definitely not be enough.

"No, at least I need to treat you twice."

"Okay, two meals then!" Xu Zhou said with a smile.

In the following time, Ning Chen prepared for new experimental directions and quickly started these experiments.

The experiment at the beginning was still not that smooth. Ning Chen tried using these three substances as the matrix, but after adding Fe and K elements, none of them achieved the ideal superconducting phenomenon.

But Ning Chen did not easily deny this experimental idea, but continued to improve the experiment through constant analysis and summary.

Finally, after more than ten days of continuous experiments, Ning Chen finally saw the ideal superconducting phenomenon!

The measured data shows that the material resistance value is already lower than 10^(-25)Ω.

Such a small resistance value can already be regarded as a superconducting phenomenon in the understanding of physics.

At this moment, Ning Chen felt that all the negative emotions he had suppressed these days were released.

"Wait a minute...why doesn't the system display the task completion message?"

According to the requirements of the system, as long as Ning Chen successfully synthesizes a new superconductor and completes the test of its superconducting performance, the task will be completed.

Ning Chen thought about the reason. Could it be that the material he synthesized was not really a superconductor, and the detection of superconductivity was just an accidental phenomenon?

However, Ning Chen quickly denied this possibility. Relying on his trust in his ability, Ning Chen knew that the measurement he had just taken would not cause any problems.

Soon, Ning Chen found a more likely reason.

Because the properties of superconductors are not just complete conductivity.

In addition, superconductors should also have complete diamagnetism and flux quantization properties.

Only if it possesses these three properties at the same time can such an object be called a superconductor in the strict sense.

Thinking of this, Ning Chen was not in a hurry to complete the system's tasks and continued to conduct more detailed measurements.

Just now when measuring the complete conductivity of a substance, Ning Chen discovered that the resistance of this substance can be reduced to 0 at around 32K.

Although such a superconducting critical temperature is not yet a high-temperature superconductor, it has proved that the model Ning Chen previously assumed does exist, and it will also provide very important significance for the continued study of superconducting phenomena.