Chapter 162: A bit unskilled, wasted some time
The optoelectronics laboratory is much larger than theirs, and can carry out preparation technologies such as chemical vapor deposition, physical vapor deposition, and pulsed laser deposition, as well as X-ray diffraction (XRD) and various electron microscopes.
All of them are equipment that Qingzhou is familiar with.
"Junior brother, BiO and BO have arrived." Gong Yunfei had already brought a material box from the side.
Wang Wei pointed to the white instrument in front and asked with a smile: "Have you ever come into contact with this equipment before?"
Xu Qingzhou said: "I read the process in the book."
Although he can operate it with his eyes closed, he is just an undergraduate, so it would be a shame to say that he is very good at it.
When it came to the experiment, Wang Wei's expression became serious, he pushed up his glasses and said, "Then I'll do it, and you can watch from the side."
Xu Qingzhou knew that senior brother Wang Wei was worried that he would damage the equipment.
Although BiO and BO are not as highly corrosive as the raw material battery solution used by Brother Wang Wei and others for battery preparation, if there is an error in the ratio, a certain instrument will be blocked
The equipment here , are quite expensive, not to mention that senior brother Wang Wei will start project experiments in a few days, and it will be troublesome if something goes wrong.
He smiled and nodded. There was an unpaid doctoral student preparing crystals for him, so he could be lazy.
Gong Yunfei said from the side: "Don't mind, for Senior Brother Wang, these devices are his wife, which is more important than his own life."
The manufacturing time of large crystals usually takes a week or even a month. Fortunately, the crystals Xu Qingzhou used in this experiment were very small, but the process was still very troublesome.
Wang Wei put on his goggles: "Junior brother, please give me the plan and ingredient list."
Xu Qingzhou handed over the documents.
Wang Wei glanced at the ratio chart and praised: "Tsk, tsk, junior brother, the writing is very professional."
After saying that, he stopped wasting time and started operating.
Weigh the raw materials accurately and mix according to the stoichiometric ratio BiO:BO=1:3.
After weighing, the uniformly mixed raw materials are placed in a clean crucible and melted.
During melting, the crystal growth method of the top seed crystal method allows the melt to gradually crystallize on the seed crystal and grow into a single crystal by introducing a seed crystal and controlling conditions such as the temperature, concentration, and flow of the melt.
During this process, parameters such as temperature gradient, melt flow rate, and pulling rate must be controlled.
Xu Qingzhou wrote these steps very clearly in the plan he just gave to Wang Wei. While Wang Wei was preparing, he was not in a hurry and went to the lounge next to him to read.
Two hours later, Wang Wei walked in.
Xu Qingzhou looked up and felt that Senior Brother Wang was quite reliable, "Senior Brother Wang, has the crystal taken shape?"
Although the laboratory has advantages in equipment and can greatly reduce the preparation time of crystals, the process from solution to crystallization to final cutting will take at least ten hours if nothing else.
Wang Wei's expression froze, he coughed dryly, and said with some embarrassment: "There was a little accident. During the growth process of the crystal, it suddenly cracked."
"I'm just here for a drink of water. Don't worry, I can definitely get the crystals you need today!"
Xu Qingzhou smiled helplessly and said, "Senior brother, why don't I do it?"
He can understand this kind of competitive mentality, but the problem is that he is in a hurry. If he fails again, he will have to wait for several hours, which is a waste of time.
"Do you do it yourself?"
"Um."
"But this equipment." Wang Wei is still worried. Although Junior Brother Xu's talent is terrible, experiments and practical operations are different. Just like him, people who often spend time in the laboratory have a complete and detailed list of ingredients. , plans, which all failed.
Xu Qingzhou said with a smile: "I just watched your operation and wrote it down." Wang Wei paused, reluctantly nodded, but couldn't help but said: "Then I'll watch from the side, what's wrong with you?" You must ask me in advance.”
Xu Qingzhou nodded in agreement.
Xu Qingzhou changed into his spare white coat, put on his goggles, and prepared to operate it himself.
Gong Yunfei came over to join in the fun at this time, or in other words, he actually wanted to "instruct and guide" this junior brother. He was a senior brother after all. He couldn't compete with his talent in theory, but he should be better in practice.
I am so touched that I finally have a place where I can reflect the role of my senior brother!
What are the most common questions faced by novices entering the laboratory?
Oh, by the way, due to the large density difference between BiO and BO, unevenness is prone to occur during the mixing process, affecting the uniformity of the melt and the growth of crystals.
Hey, junior brother, that's good. I didn't forget to sift it first.
That's right, in front of the test bench, Xu Qingzhou took out the two oxides BiO and BO, first sieved them, and then started to proportion them.
Wang Wei watched every step of Xu Qingzhou's steps, so that he could remind him in time when Xu Qingzhou made mistakes.
20 minutes passed.
Wang Wei's expression is complicated, and Xu Qingzhou's movements are skillful and methodical, and every step is quite precise. It can be used as a teaching video.
On the side, Gong Yunfei was also stunned, with only two words in his mind: professional.
At this end, Xu Qingzhou had already completed the weighing and preparation for smelting. When he looked up, he saw Wang Wei and Gong Yunfei staring at him.
He smiled shyly and said, "Sorry, I'm a bit inexperienced and wasted some time."
The corner of Wang Wei's mouth twitched, and his speed was almost twice as fast as him, and still accurate.
Fast and accurate, is this called handcrafting?
Gong Yunfei's mood is also complicated, feeling emotional and shocked at the same time. Is this junior brother a little too outrageous? !
At noon, Wang Wei and the others went to eat, while Xu Qingzhou stayed here to watch.
Before leaving, Wang Wei gave him a detailed explanation of the laboratory precautions.
The most important experimental rule is specially emphasized - ensure your own safety.
After all, although these instruments and equipment are very expensive, people come first after all. Once an accident such as a fire occurs, the safety of people must be ensured first, and the instruments second.
After an hour, Xu Qingzhou adjusted the temperature field of the crystal growth furnace to 750°C and turned on the stirrer to ensure uniform mixing of raw materials and discharge of bubbles.
When the raw materials began to condense, he introduced the seed crystal into the growth furnace.
At this point, the entire preparation experiment is mostly successful, and then there is a long waiting time, which takes about 12 hours.
After doing this, Xu Qingzhou took off his goggles and sat on a chair to read the battery materials book that senior brother Wang Wei left for him to kill time.
Time passed minute by minute, and at 1:30, Ren Xiaoling came to change her shift.
The rest of the work is relatively simple, just stay by and if the instrument sounds an alarm or cracks appear on the crystal, press the stop button to stop the experiment.
This also means that the experiment fails and has to be started again.
Of course, Xu Qingzhou is confident that this will not happen.
(There are only two chapters today)
(End of this chapter)